Removed fixed dependencies

packages/analyzer/lib/src/summary/format.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+//
+// This file has been automatically generated.  Please do not edit it manually.
+// To regenerate the file, use the script "pkg/analyzer/tool/generate_files".
+
+library analyzer.src.summary.format;
+
+import 'flat_buffers.dart' as fb;
+import 'idl.dart' as idl;
+import 'dart:convert' as convert;
+import 'api_signature.dart' as api_sig;
+
+class _IndexNameKindReader extends fb.Reader<idl.IndexNameKind> {
+  const _IndexNameKindReader() : super();
+
+  @override
+  int get size => 1;
+
+  @override
+  idl.IndexNameKind read(fb.BufferContext bc, int offset) {
+    int index = const fb.Uint8Reader().read(bc, offset);
+    return index < idl.IndexNameKind.values.length ? idl.IndexNameKind.values[index] : idl.IndexNameKind.topLevel;
+  }
+}
+
+class _IndexRelationKindReader extends fb.Reader<idl.IndexRelationKind> {
+  const _IndexRelationKindReader() : super();
+
+  @override
+  int get size => 1;
+
+  @override
+  idl.IndexRelationKind read(fb.BufferContext bc, int offset) {
+    int index = const fb.Uint8Reader().read(bc, offset);
+    return index < idl.IndexRelationKind.values.length ? idl.IndexRelationKind.values[index] : idl.IndexRelationKind.IS_ANCESTOR_OF;
+  }
+}
+
+class _IndexSyntheticElementKindReader extends fb.Reader<idl.IndexSyntheticElementKind> {
+  const _IndexSyntheticElementKindReader() : super();
+
+  @override
+  int get size => 1;
+
+  @override
+  idl.IndexSyntheticElementKind read(fb.BufferContext bc, int offset) {
+    int index = const fb.Uint8Reader().read(bc, offset);
+    return index < idl.IndexSyntheticElementKind.values.length ? idl.IndexSyntheticElementKind.values[index] : idl.IndexSyntheticElementKind.notSynthetic;
+  }
+}
+
+class _ReferenceKindReader extends fb.Reader<idl.ReferenceKind> {
+  const _ReferenceKindReader() : super();
+
+  @override
+  int get size => 1;
+
+  @override
+  idl.ReferenceKind read(fb.BufferContext bc, int offset) {
+    int index = const fb.Uint8Reader().read(bc, offset);
+    return index < idl.ReferenceKind.values.length ? idl.ReferenceKind.values[index] : idl.ReferenceKind.classOrEnum;
+  }
+}
+
+class _UnlinkedConstOperationReader extends fb.Reader<idl.UnlinkedConstOperation> {
+  const _UnlinkedConstOperationReader() : super();
+
+  @override
+  int get size => 1;
+
+  @override
+  idl.UnlinkedConstOperation read(fb.BufferContext bc, int offset) {
+    int index = const fb.Uint8Reader().read(bc, offset);
+    return index < idl.UnlinkedConstOperation.values.length ? idl.UnlinkedConstOperation.values[index] : idl.UnlinkedConstOperation.pushInt;
+  }
+}
+
+class _UnlinkedConstructorInitializerKindReader extends fb.Reader<idl.UnlinkedConstructorInitializerKind> {
+  const _UnlinkedConstructorInitializerKindReader() : super();
+
+  @override
+  int get size => 1;
+
+  @override
+  idl.UnlinkedConstructorInitializerKind read(fb.BufferContext bc, int offset) {
+    int index = const fb.Uint8Reader().read(bc, offset);
+    return index < idl.UnlinkedConstructorInitializerKind.values.length ? idl.UnlinkedConstructorInitializerKind.values[index] : idl.UnlinkedConstructorInitializerKind.field;
+  }
+}
+
+class _UnlinkedExecutableKindReader extends fb.Reader<idl.UnlinkedExecutableKind> {
+  const _UnlinkedExecutableKindReader() : super();
+
+  @override
+  int get size => 1;
+
+  @override
+  idl.UnlinkedExecutableKind read(fb.BufferContext bc, int offset) {
+    int index = const fb.Uint8Reader().read(bc, offset);
+    return index < idl.UnlinkedExecutableKind.values.length ? idl.UnlinkedExecutableKind.values[index] : idl.UnlinkedExecutableKind.functionOrMethod;
+  }
+}
+
+class _UnlinkedExprAssignOperatorReader extends fb.Reader<idl.UnlinkedExprAssignOperator> {
+  const _UnlinkedExprAssignOperatorReader() : super();
+
+  @override
+  int get size => 1;
+
+  @override
+  idl.UnlinkedExprAssignOperator read(fb.BufferContext bc, int offset) {
+    int index = const fb.Uint8Reader().read(bc, offset);
+    return index < idl.UnlinkedExprAssignOperator.values.length ? idl.UnlinkedExprAssignOperator.values[index] : idl.UnlinkedExprAssignOperator.assign;
+  }
+}
+
+class _UnlinkedParamKindReader extends fb.Reader<idl.UnlinkedParamKind> {
+  const _UnlinkedParamKindReader() : super();
+
+  @override
+  int get size => 1;
+
+  @override
+  idl.UnlinkedParamKind read(fb.BufferContext bc, int offset) {
+    int index = const fb.Uint8Reader().read(bc, offset);
+    return index < idl.UnlinkedParamKind.values.length ? idl.UnlinkedParamKind.values[index] : idl.UnlinkedParamKind.required;
+  }
+}
+
+class CodeRangeBuilder extends Object with _CodeRangeMixin implements idl.CodeRange {
+  int _length;
+  int _offset;
+
+  @override
+  int get length => _length ??= 0;
+
+  /**
+   * Length of the element code.
+   */
+  void set length(int value) {
+    assert(value == null || value >= 0);
+    this._length = value;
+  }
+
+  @override
+  int get offset => _offset ??= 0;
+
+  /**
+   * Offset of the element code relative to the beginning of the file.
+   */
+  void set offset(int value) {
+    assert(value == null || value >= 0);
+    this._offset = value;
+  }
+
+  CodeRangeBuilder({int length, int offset})
+    : _length = length,
+      _offset = offset;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addInt(this._offset ?? 0);
+    signature.addInt(this._length ?? 0);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fbBuilder.startTable();
+    if (_length != null && _length != 0) {
+      fbBuilder.addUint32(1, _length);
+    }
+    if (_offset != null && _offset != 0) {
+      fbBuilder.addUint32(0, _offset);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _CodeRangeReader extends fb.TableReader<_CodeRangeImpl> {
+  const _CodeRangeReader();
+
+  @override
+  _CodeRangeImpl createObject(fb.BufferContext bc, int offset) => new _CodeRangeImpl(bc, offset);
+}
+
+class _CodeRangeImpl extends Object with _CodeRangeMixin implements idl.CodeRange {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _CodeRangeImpl(this._bc, this._bcOffset);
+
+  int _length;
+  int _offset;
+
+  @override
+  int get length {
+    _length ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _length;
+  }
+
+  @override
+  int get offset {
+    _offset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 0, 0);
+    return _offset;
+  }
+}
+
+abstract class _CodeRangeMixin implements idl.CodeRange {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (length != 0) _result["length"] = length;
+    if (offset != 0) _result["offset"] = offset;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "length": length,
+    "offset": offset,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class EntityRefBuilder extends Object with _EntityRefMixin implements idl.EntityRef {
+  List<int> _implicitFunctionTypeIndices;
+  int _paramReference;
+  int _reference;
+  int _slot;
+  List<UnlinkedParamBuilder> _syntheticParams;
+  EntityRefBuilder _syntheticReturnType;
+  List<EntityRefBuilder> _typeArguments;
+
+  @override
+  List<int> get implicitFunctionTypeIndices => _implicitFunctionTypeIndices ??= <int>[];
+
+  /**
+   * If this is a reference to a function type implicitly defined by a
+   * function-typed parameter, a list of zero-based indices indicating the path
+   * from the entity referred to by [reference] to the appropriate type
+   * parameter.  Otherwise the empty list.
+   *
+   * If there are N indices in this list, then the entity being referred to is
+   * the function type implicitly defined by a function-typed parameter of a
+   * function-typed parameter, to N levels of nesting.  The first index in the
+   * list refers to the outermost level of nesting; for example if [reference]
+   * refers to the entity defined by:
+   *
+   *     void f(x, void g(y, z, int h(String w))) { ... }
+   *
+   * Then to refer to the function type implicitly defined by parameter `h`
+   * (which is parameter 2 of parameter 1 of `f`), then
+   * [implicitFunctionTypeIndices] should be [1, 2].
+   *
+   * Note that if the entity being referred to is a generic method inside a
+   * generic class, then the type arguments in [typeArguments] are applied
+   * first to the class and then to the method.
+   */
+  void set implicitFunctionTypeIndices(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._implicitFunctionTypeIndices = value;
+  }
+
+  @override
+  int get paramReference => _paramReference ??= 0;
+
+  /**
+   * If this is a reference to a type parameter, one-based index into the list
+   * of [UnlinkedTypeParam]s currently in effect.  Indexing is done using De
+   * Bruijn index conventions; that is, innermost parameters come first, and
+   * if a class or method has multiple parameters, they are indexed from right
+   * to left.  So for instance, if the enclosing declaration is
+   *
+   *     class C<T,U> {
+   *       m<V,W> {
+   *         ...
+   *       }
+   *     }
+   *
+   * Then [paramReference] values of 1, 2, 3, and 4 represent W, V, U, and T,
+   * respectively.
+   *
+   * If the type being referred to is not a type parameter, [paramReference] is
+   * zero.
+   */
+  void set paramReference(int value) {
+    assert(value == null || value >= 0);
+    this._paramReference = value;
+  }
+
+  @override
+  int get reference => _reference ??= 0;
+
+  /**
+   * Index into [UnlinkedUnit.references] for the entity being referred to, or
+   * zero if this is a reference to a type parameter.
+   */
+  void set reference(int value) {
+    assert(value == null || value >= 0);
+    this._reference = value;
+  }
+
+  @override
+  int get slot => _slot ??= 0;
+
+  /**
+   * If this [EntityRef] is contained within [LinkedUnit.types], slot id (which
+   * is unique within the compilation unit) identifying the target of type
+   * propagation or type inference with which this [EntityRef] is associated.
+   *
+   * Otherwise zero.
+   */
+  void set slot(int value) {
+    assert(value == null || value >= 0);
+    this._slot = value;
+  }
+
+  @override
+  List<UnlinkedParamBuilder> get syntheticParams => _syntheticParams ??= <UnlinkedParamBuilder>[];
+
+  /**
+   * If this [EntityRef] is a reference to a function type whose
+   * [FunctionElement] is not in any library (e.g. a function type that was
+   * synthesized by a LUB computation), the function parameters.  Otherwise
+   * empty.
+   */
+  void set syntheticParams(List<UnlinkedParamBuilder> value) {
+    this._syntheticParams = value;
+  }
+
+  @override
+  EntityRefBuilder get syntheticReturnType => _syntheticReturnType;
+
+  /**
+   * If this [EntityRef] is a reference to a function type whose
+   * [FunctionElement] is not in any library (e.g. a function type that was
+   * synthesized by a LUB computation), the return type of the function.
+   * Otherwise `null`.
+   */
+  void set syntheticReturnType(EntityRefBuilder value) {
+    this._syntheticReturnType = value;
+  }
+
+  @override
+  List<EntityRefBuilder> get typeArguments => _typeArguments ??= <EntityRefBuilder>[];
+
+  /**
+   * If this is an instantiation of a generic type or generic executable, the
+   * type arguments used to instantiate it (if any).
+   */
+  void set typeArguments(List<EntityRefBuilder> value) {
+    this._typeArguments = value;
+  }
+
+  EntityRefBuilder({List<int> implicitFunctionTypeIndices, int paramReference, int reference, int slot, List<UnlinkedParamBuilder> syntheticParams, EntityRefBuilder syntheticReturnType, List<EntityRefBuilder> typeArguments})
+    : _implicitFunctionTypeIndices = implicitFunctionTypeIndices,
+      _paramReference = paramReference,
+      _reference = reference,
+      _slot = slot,
+      _syntheticParams = syntheticParams,
+      _syntheticReturnType = syntheticReturnType,
+      _typeArguments = typeArguments;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _syntheticParams?.forEach((b) => b.flushInformative());
+    _syntheticReturnType?.flushInformative();
+    _typeArguments?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addInt(this._reference ?? 0);
+    if (this._typeArguments == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._typeArguments.length);
+      for (var x in this._typeArguments) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addInt(this._slot ?? 0);
+    signature.addInt(this._paramReference ?? 0);
+    if (this._implicitFunctionTypeIndices == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._implicitFunctionTypeIndices.length);
+      for (var x in this._implicitFunctionTypeIndices) {
+        signature.addInt(x);
+      }
+    }
+    signature.addBool(this._syntheticReturnType != null);
+    this._syntheticReturnType?.collectApiSignature(signature);
+    if (this._syntheticParams == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._syntheticParams.length);
+      for (var x in this._syntheticParams) {
+        x?.collectApiSignature(signature);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_implicitFunctionTypeIndices;
+    fb.Offset offset_syntheticParams;
+    fb.Offset offset_syntheticReturnType;
+    fb.Offset offset_typeArguments;
+    if (!(_implicitFunctionTypeIndices == null || _implicitFunctionTypeIndices.isEmpty)) {
+      offset_implicitFunctionTypeIndices = fbBuilder.writeListUint32(_implicitFunctionTypeIndices);
+    }
+    if (!(_syntheticParams == null || _syntheticParams.isEmpty)) {
+      offset_syntheticParams = fbBuilder.writeList(_syntheticParams.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_syntheticReturnType != null) {
+      offset_syntheticReturnType = _syntheticReturnType.finish(fbBuilder);
+    }
+    if (!(_typeArguments == null || _typeArguments.isEmpty)) {
+      offset_typeArguments = fbBuilder.writeList(_typeArguments.map((b) => b.finish(fbBuilder)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_implicitFunctionTypeIndices != null) {
+      fbBuilder.addOffset(4, offset_implicitFunctionTypeIndices);
+    }
+    if (_paramReference != null && _paramReference != 0) {
+      fbBuilder.addUint32(3, _paramReference);
+    }
+    if (_reference != null && _reference != 0) {
+      fbBuilder.addUint32(0, _reference);
+    }
+    if (_slot != null && _slot != 0) {
+      fbBuilder.addUint32(2, _slot);
+    }
+    if (offset_syntheticParams != null) {
+      fbBuilder.addOffset(6, offset_syntheticParams);
+    }
+    if (offset_syntheticReturnType != null) {
+      fbBuilder.addOffset(5, offset_syntheticReturnType);
+    }
+    if (offset_typeArguments != null) {
+      fbBuilder.addOffset(1, offset_typeArguments);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _EntityRefReader extends fb.TableReader<_EntityRefImpl> {
+  const _EntityRefReader();
+
+  @override
+  _EntityRefImpl createObject(fb.BufferContext bc, int offset) => new _EntityRefImpl(bc, offset);
+}
+
+class _EntityRefImpl extends Object with _EntityRefMixin implements idl.EntityRef {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _EntityRefImpl(this._bc, this._bcOffset);
+
+  List<int> _implicitFunctionTypeIndices;
+  int _paramReference;
+  int _reference;
+  int _slot;
+  List<idl.UnlinkedParam> _syntheticParams;
+  idl.EntityRef _syntheticReturnType;
+  List<idl.EntityRef> _typeArguments;
+
+  @override
+  List<int> get implicitFunctionTypeIndices {
+    _implicitFunctionTypeIndices ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 4, const <int>[]);
+    return _implicitFunctionTypeIndices;
+  }
+
+  @override
+  int get paramReference {
+    _paramReference ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 3, 0);
+    return _paramReference;
+  }
+
+  @override
+  int get reference {
+    _reference ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 0, 0);
+    return _reference;
+  }
+
+  @override
+  int get slot {
+    _slot ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 2, 0);
+    return _slot;
+  }
+
+  @override
+  List<idl.UnlinkedParam> get syntheticParams {
+    _syntheticParams ??= const fb.ListReader<idl.UnlinkedParam>(const _UnlinkedParamReader()).vTableGet(_bc, _bcOffset, 6, const <idl.UnlinkedParam>[]);
+    return _syntheticParams;
+  }
+
+  @override
+  idl.EntityRef get syntheticReturnType {
+    _syntheticReturnType ??= const _EntityRefReader().vTableGet(_bc, _bcOffset, 5, null);
+    return _syntheticReturnType;
+  }
+
+  @override
+  List<idl.EntityRef> get typeArguments {
+    _typeArguments ??= const fb.ListReader<idl.EntityRef>(const _EntityRefReader()).vTableGet(_bc, _bcOffset, 1, const <idl.EntityRef>[]);
+    return _typeArguments;
+  }
+}
+
+abstract class _EntityRefMixin implements idl.EntityRef {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (implicitFunctionTypeIndices.isNotEmpty) _result["implicitFunctionTypeIndices"] = implicitFunctionTypeIndices;
+    if (paramReference != 0) _result["paramReference"] = paramReference;
+    if (reference != 0) _result["reference"] = reference;
+    if (slot != 0) _result["slot"] = slot;
+    if (syntheticParams.isNotEmpty) _result["syntheticParams"] = syntheticParams.map((_value) => _value.toJson()).toList();
+    if (syntheticReturnType != null) _result["syntheticReturnType"] = syntheticReturnType.toJson();
+    if (typeArguments.isNotEmpty) _result["typeArguments"] = typeArguments.map((_value) => _value.toJson()).toList();
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "implicitFunctionTypeIndices": implicitFunctionTypeIndices,
+    "paramReference": paramReference,
+    "reference": reference,
+    "slot": slot,
+    "syntheticParams": syntheticParams,
+    "syntheticReturnType": syntheticReturnType,
+    "typeArguments": typeArguments,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class LinkedDependencyBuilder extends Object with _LinkedDependencyMixin implements idl.LinkedDependency {
+  List<String> _parts;
+  String _uri;
+
+  @override
+  List<String> get parts => _parts ??= <String>[];
+
+  /**
+   * URI for the compilation units listed in the library's `part` declarations.
+   * These URIs are relative to the importing library.
+   */
+  void set parts(List<String> value) {
+    this._parts = value;
+  }
+
+  @override
+  String get uri => _uri ??= '';
+
+  /**
+   * The relative URI of the dependent library.  This URI is relative to the
+   * importing library, even if there are intervening `export` declarations.
+   * So, for example, if `a.dart` imports `b/c.dart` and `b/c.dart` exports
+   * `d/e.dart`, the URI listed for `a.dart`'s dependency on `e.dart` will be
+   * `b/d/e.dart`.
+   */
+  void set uri(String value) {
+    this._uri = value;
+  }
+
+  LinkedDependencyBuilder({List<String> parts, String uri})
+    : _parts = parts,
+      _uri = uri;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._uri ?? '');
+    if (this._parts == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._parts.length);
+      for (var x in this._parts) {
+        signature.addString(x);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_parts;
+    fb.Offset offset_uri;
+    if (!(_parts == null || _parts.isEmpty)) {
+      offset_parts = fbBuilder.writeList(_parts.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    if (_uri != null) {
+      offset_uri = fbBuilder.writeString(_uri);
+    }
+    fbBuilder.startTable();
+    if (offset_parts != null) {
+      fbBuilder.addOffset(1, offset_parts);
+    }
+    if (offset_uri != null) {
+      fbBuilder.addOffset(0, offset_uri);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _LinkedDependencyReader extends fb.TableReader<_LinkedDependencyImpl> {
+  const _LinkedDependencyReader();
+
+  @override
+  _LinkedDependencyImpl createObject(fb.BufferContext bc, int offset) => new _LinkedDependencyImpl(bc, offset);
+}
+
+class _LinkedDependencyImpl extends Object with _LinkedDependencyMixin implements idl.LinkedDependency {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _LinkedDependencyImpl(this._bc, this._bcOffset);
+
+  List<String> _parts;
+  String _uri;
+
+  @override
+  List<String> get parts {
+    _parts ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 1, const <String>[]);
+    return _parts;
+  }
+
+  @override
+  String get uri {
+    _uri ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _uri;
+  }
+}
+
+abstract class _LinkedDependencyMixin implements idl.LinkedDependency {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (parts.isNotEmpty) _result["parts"] = parts;
+    if (uri != '') _result["uri"] = uri;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "parts": parts,
+    "uri": uri,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class LinkedExportNameBuilder extends Object with _LinkedExportNameMixin implements idl.LinkedExportName {
+  int _dependency;
+  idl.ReferenceKind _kind;
+  String _name;
+  int _unit;
+
+  @override
+  int get dependency => _dependency ??= 0;
+
+  /**
+   * Index into [LinkedLibrary.dependencies] for the library in which the
+   * entity is defined.
+   */
+  void set dependency(int value) {
+    assert(value == null || value >= 0);
+    this._dependency = value;
+  }
+
+  @override
+  idl.ReferenceKind get kind => _kind ??= idl.ReferenceKind.classOrEnum;
+
+  /**
+   * The kind of the entity being referred to.
+   */
+  void set kind(idl.ReferenceKind value) {
+    this._kind = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the exported entity.  For an exported setter, this name includes
+   * the trailing '='.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get unit => _unit ??= 0;
+
+  /**
+   * Integer index indicating which unit in the exported library contains the
+   * definition of the entity.  As with indices into [LinkedLibrary.units],
+   * zero represents the defining compilation unit, and nonzero values
+   * represent parts in the order of the corresponding `part` declarations.
+   */
+  void set unit(int value) {
+    assert(value == null || value >= 0);
+    this._unit = value;
+  }
+
+  LinkedExportNameBuilder({int dependency, idl.ReferenceKind kind, String name, int unit})
+    : _dependency = dependency,
+      _kind = kind,
+      _name = name,
+      _unit = unit;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addInt(this._dependency ?? 0);
+    signature.addString(this._name ?? '');
+    signature.addInt(this._unit ?? 0);
+    signature.addInt(this._kind == null ? 0 : this._kind.index);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_name;
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    fbBuilder.startTable();
+    if (_dependency != null && _dependency != 0) {
+      fbBuilder.addUint32(0, _dependency);
+    }
+    if (_kind != null && _kind != idl.ReferenceKind.classOrEnum) {
+      fbBuilder.addUint8(3, _kind.index);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(1, offset_name);
+    }
+    if (_unit != null && _unit != 0) {
+      fbBuilder.addUint32(2, _unit);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _LinkedExportNameReader extends fb.TableReader<_LinkedExportNameImpl> {
+  const _LinkedExportNameReader();
+
+  @override
+  _LinkedExportNameImpl createObject(fb.BufferContext bc, int offset) => new _LinkedExportNameImpl(bc, offset);
+}
+
+class _LinkedExportNameImpl extends Object with _LinkedExportNameMixin implements idl.LinkedExportName {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _LinkedExportNameImpl(this._bc, this._bcOffset);
+
+  int _dependency;
+  idl.ReferenceKind _kind;
+  String _name;
+  int _unit;
+
+  @override
+  int get dependency {
+    _dependency ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 0, 0);
+    return _dependency;
+  }
+
+  @override
+  idl.ReferenceKind get kind {
+    _kind ??= const _ReferenceKindReader().vTableGet(_bc, _bcOffset, 3, idl.ReferenceKind.classOrEnum);
+    return _kind;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 1, '');
+    return _name;
+  }
+
+  @override
+  int get unit {
+    _unit ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 2, 0);
+    return _unit;
+  }
+}
+
+abstract class _LinkedExportNameMixin implements idl.LinkedExportName {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (dependency != 0) _result["dependency"] = dependency;
+    if (kind != idl.ReferenceKind.classOrEnum) _result["kind"] = kind.toString().split('.')[1];
+    if (name != '') _result["name"] = name;
+    if (unit != 0) _result["unit"] = unit;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "dependency": dependency,
+    "kind": kind,
+    "name": name,
+    "unit": unit,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class LinkedLibraryBuilder extends Object with _LinkedLibraryMixin implements idl.LinkedLibrary {
+  List<LinkedDependencyBuilder> _dependencies;
+  List<int> _exportDependencies;
+  List<LinkedExportNameBuilder> _exportNames;
+  bool _fallbackMode;
+  List<int> _importDependencies;
+  int _numPrelinkedDependencies;
+  List<LinkedUnitBuilder> _units;
+
+  @override
+  List<LinkedDependencyBuilder> get dependencies => _dependencies ??= <LinkedDependencyBuilder>[];
+
+  /**
+   * The libraries that this library depends on (either via an explicit import
+   * statement or via the implicit dependencies on `dart:core` and
+   * `dart:async`).  The first element of this array is a pseudo-dependency
+   * representing the library itself (it is also used for `dynamic` and
+   * `void`).  This is followed by elements representing "prelinked"
+   * dependencies (direct imports and the transitive closure of exports).
+   * After the prelinked dependencies are elements representing "linked"
+   * dependencies.
+   *
+   * A library is only included as a "linked" dependency if it is a true
+   * dependency (e.g. a propagated or inferred type or constant value
+   * implicitly refers to an element declared in the library) or
+   * anti-dependency (e.g. the result of type propagation or type inference
+   * depends on the lack of a certain declaration in the library).
+   */
+  void set dependencies(List<LinkedDependencyBuilder> value) {
+    this._dependencies = value;
+  }
+
+  @override
+  List<int> get exportDependencies => _exportDependencies ??= <int>[];
+
+  /**
+   * For each export in [UnlinkedUnit.exports], an index into [dependencies]
+   * of the library being exported.
+   */
+  void set exportDependencies(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._exportDependencies = value;
+  }
+
+  @override
+  List<LinkedExportNameBuilder> get exportNames => _exportNames ??= <LinkedExportNameBuilder>[];
+
+  /**
+   * Information about entities in the export namespace of the library that are
+   * not in the public namespace of the library (that is, entities that are
+   * brought into the namespace via `export` directives).
+   *
+   * Sorted by name.
+   */
+  void set exportNames(List<LinkedExportNameBuilder> value) {
+    this._exportNames = value;
+  }
+
+  @override
+  bool get fallbackMode => _fallbackMode ??= false;
+
+  /**
+   * Indicates whether this library was summarized in "fallback mode".  If
+   * true, all other fields in the data structure have their default values.
+   */
+  void set fallbackMode(bool value) {
+    this._fallbackMode = value;
+  }
+
+  @override
+  List<int> get importDependencies => _importDependencies ??= <int>[];
+
+  /**
+   * For each import in [UnlinkedUnit.imports], an index into [dependencies]
+   * of the library being imported.
+   */
+  void set importDependencies(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._importDependencies = value;
+  }
+
+  @override
+  int get numPrelinkedDependencies => _numPrelinkedDependencies ??= 0;
+
+  /**
+   * The number of elements in [dependencies] which are not "linked"
+   * dependencies (that is, the number of libraries in the direct imports plus
+   * the transitive closure of exports, plus the library itself).
+   */
+  void set numPrelinkedDependencies(int value) {
+    assert(value == null || value >= 0);
+    this._numPrelinkedDependencies = value;
+  }
+
+  @override
+  List<LinkedUnitBuilder> get units => _units ??= <LinkedUnitBuilder>[];
+
+  /**
+   * The linked summary of all the compilation units constituting the
+   * library.  The summary of the defining compilation unit is listed first,
+   * followed by the summary of each part, in the order of the `part`
+   * declarations in the defining compilation unit.
+   */
+  void set units(List<LinkedUnitBuilder> value) {
+    this._units = value;
+  }
+
+  LinkedLibraryBuilder({List<LinkedDependencyBuilder> dependencies, List<int> exportDependencies, List<LinkedExportNameBuilder> exportNames, bool fallbackMode, List<int> importDependencies, int numPrelinkedDependencies, List<LinkedUnitBuilder> units})
+    : _dependencies = dependencies,
+      _exportDependencies = exportDependencies,
+      _exportNames = exportNames,
+      _fallbackMode = fallbackMode,
+      _importDependencies = importDependencies,
+      _numPrelinkedDependencies = numPrelinkedDependencies,
+      _units = units;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _dependencies?.forEach((b) => b.flushInformative());
+    _exportNames?.forEach((b) => b.flushInformative());
+    _units?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    if (this._dependencies == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._dependencies.length);
+      for (var x in this._dependencies) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._importDependencies == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._importDependencies.length);
+      for (var x in this._importDependencies) {
+        signature.addInt(x);
+      }
+    }
+    signature.addInt(this._numPrelinkedDependencies ?? 0);
+    if (this._units == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._units.length);
+      for (var x in this._units) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._exportNames == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._exportNames.length);
+      for (var x in this._exportNames) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addBool(this._fallbackMode == true);
+    if (this._exportDependencies == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._exportDependencies.length);
+      for (var x in this._exportDependencies) {
+        signature.addInt(x);
+      }
+    }
+  }
+
+  List<int> toBuffer() {
+    fb.Builder fbBuilder = new fb.Builder();
+    return fbBuilder.finish(finish(fbBuilder), "LLib");
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_dependencies;
+    fb.Offset offset_exportDependencies;
+    fb.Offset offset_exportNames;
+    fb.Offset offset_importDependencies;
+    fb.Offset offset_units;
+    if (!(_dependencies == null || _dependencies.isEmpty)) {
+      offset_dependencies = fbBuilder.writeList(_dependencies.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_exportDependencies == null || _exportDependencies.isEmpty)) {
+      offset_exportDependencies = fbBuilder.writeListUint32(_exportDependencies);
+    }
+    if (!(_exportNames == null || _exportNames.isEmpty)) {
+      offset_exportNames = fbBuilder.writeList(_exportNames.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_importDependencies == null || _importDependencies.isEmpty)) {
+      offset_importDependencies = fbBuilder.writeListUint32(_importDependencies);
+    }
+    if (!(_units == null || _units.isEmpty)) {
+      offset_units = fbBuilder.writeList(_units.map((b) => b.finish(fbBuilder)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_dependencies != null) {
+      fbBuilder.addOffset(0, offset_dependencies);
+    }
+    if (offset_exportDependencies != null) {
+      fbBuilder.addOffset(6, offset_exportDependencies);
+    }
+    if (offset_exportNames != null) {
+      fbBuilder.addOffset(4, offset_exportNames);
+    }
+    if (_fallbackMode == true) {
+      fbBuilder.addBool(5, true);
+    }
+    if (offset_importDependencies != null) {
+      fbBuilder.addOffset(1, offset_importDependencies);
+    }
+    if (_numPrelinkedDependencies != null && _numPrelinkedDependencies != 0) {
+      fbBuilder.addUint32(2, _numPrelinkedDependencies);
+    }
+    if (offset_units != null) {
+      fbBuilder.addOffset(3, offset_units);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+idl.LinkedLibrary readLinkedLibrary(List<int> buffer) {
+  fb.BufferContext rootRef = new fb.BufferContext.fromBytes(buffer);
+  return const _LinkedLibraryReader().read(rootRef, 0);
+}
+
+class _LinkedLibraryReader extends fb.TableReader<_LinkedLibraryImpl> {
+  const _LinkedLibraryReader();
+
+  @override
+  _LinkedLibraryImpl createObject(fb.BufferContext bc, int offset) => new _LinkedLibraryImpl(bc, offset);
+}
+
+class _LinkedLibraryImpl extends Object with _LinkedLibraryMixin implements idl.LinkedLibrary {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _LinkedLibraryImpl(this._bc, this._bcOffset);
+
+  List<idl.LinkedDependency> _dependencies;
+  List<int> _exportDependencies;
+  List<idl.LinkedExportName> _exportNames;
+  bool _fallbackMode;
+  List<int> _importDependencies;
+  int _numPrelinkedDependencies;
+  List<idl.LinkedUnit> _units;
+
+  @override
+  List<idl.LinkedDependency> get dependencies {
+    _dependencies ??= const fb.ListReader<idl.LinkedDependency>(const _LinkedDependencyReader()).vTableGet(_bc, _bcOffset, 0, const <idl.LinkedDependency>[]);
+    return _dependencies;
+  }
+
+  @override
+  List<int> get exportDependencies {
+    _exportDependencies ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 6, const <int>[]);
+    return _exportDependencies;
+  }
+
+  @override
+  List<idl.LinkedExportName> get exportNames {
+    _exportNames ??= const fb.ListReader<idl.LinkedExportName>(const _LinkedExportNameReader()).vTableGet(_bc, _bcOffset, 4, const <idl.LinkedExportName>[]);
+    return _exportNames;
+  }
+
+  @override
+  bool get fallbackMode {
+    _fallbackMode ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 5, false);
+    return _fallbackMode;
+  }
+
+  @override
+  List<int> get importDependencies {
+    _importDependencies ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 1, const <int>[]);
+    return _importDependencies;
+  }
+
+  @override
+  int get numPrelinkedDependencies {
+    _numPrelinkedDependencies ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 2, 0);
+    return _numPrelinkedDependencies;
+  }
+
+  @override
+  List<idl.LinkedUnit> get units {
+    _units ??= const fb.ListReader<idl.LinkedUnit>(const _LinkedUnitReader()).vTableGet(_bc, _bcOffset, 3, const <idl.LinkedUnit>[]);
+    return _units;
+  }
+}
+
+abstract class _LinkedLibraryMixin implements idl.LinkedLibrary {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (dependencies.isNotEmpty) _result["dependencies"] = dependencies.map((_value) => _value.toJson()).toList();
+    if (exportDependencies.isNotEmpty) _result["exportDependencies"] = exportDependencies;
+    if (exportNames.isNotEmpty) _result["exportNames"] = exportNames.map((_value) => _value.toJson()).toList();
+    if (fallbackMode != false) _result["fallbackMode"] = fallbackMode;
+    if (importDependencies.isNotEmpty) _result["importDependencies"] = importDependencies;
+    if (numPrelinkedDependencies != 0) _result["numPrelinkedDependencies"] = numPrelinkedDependencies;
+    if (units.isNotEmpty) _result["units"] = units.map((_value) => _value.toJson()).toList();
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "dependencies": dependencies,
+    "exportDependencies": exportDependencies,
+    "exportNames": exportNames,
+    "fallbackMode": fallbackMode,
+    "importDependencies": importDependencies,
+    "numPrelinkedDependencies": numPrelinkedDependencies,
+    "units": units,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class LinkedReferenceBuilder extends Object with _LinkedReferenceMixin implements idl.LinkedReference {
+  int _containingReference;
+  int _dependency;
+  idl.ReferenceKind _kind;
+  int _localIndex;
+  String _name;
+  int _numTypeParameters;
+  int _unit;
+
+  @override
+  int get containingReference => _containingReference ??= 0;
+
+  /**
+   * If this [LinkedReference] doesn't have an associated [UnlinkedReference],
+   * and the entity being referred to is contained within another entity, index
+   * of the containing entity.  This behaves similarly to
+   * [UnlinkedReference.prefixReference], however it is only used for class
+   * members, not for prefixed imports.
+   *
+   * Containing references must always point backward; that is, for all i, if
+   * LinkedUnit.references[i].containingReference != 0, then
+   * LinkedUnit.references[i].containingReference < i.
+   */
+  void set containingReference(int value) {
+    assert(value == null || value >= 0);
+    this._containingReference = value;
+  }
+
+  @override
+  int get dependency => _dependency ??= 0;
+
+  /**
+   * Index into [LinkedLibrary.dependencies] indicating which imported library
+   * declares the entity being referred to.
+   *
+   * Zero if this entity is contained within another entity (e.g. a class
+   * member), or if [kind] is [ReferenceKind.prefix].
+   */
+  void set dependency(int value) {
+    assert(value == null || value >= 0);
+    this._dependency = value;
+  }
+
+  @override
+  idl.ReferenceKind get kind => _kind ??= idl.ReferenceKind.classOrEnum;
+
+  /**
+   * The kind of the entity being referred to.  For the pseudo-types `dynamic`
+   * and `void`, the kind is [ReferenceKind.classOrEnum].
+   */
+  void set kind(idl.ReferenceKind value) {
+    this._kind = value;
+  }
+
+  @override
+  int get localIndex => _localIndex ??= 0;
+
+  /**
+   * If [kind] is [ReferenceKind.function] (that is, the entity being referred
+   * to is a local function), the index of the function within
+   * [UnlinkedExecutable.localFunctions].  If [kind] is
+   * [ReferenceKind.variable], the index of the variable within
+   * [UnlinkedExecutable.localVariables].  Otherwise zero.
+   */
+  void set localIndex(int value) {
+    assert(value == null || value >= 0);
+    this._localIndex = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * If this [LinkedReference] doesn't have an associated [UnlinkedReference],
+   * name of the entity being referred to.  For the pseudo-type `dynamic`, the
+   * string is "dynamic".  For the pseudo-type `void`, the string is "void".
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get numTypeParameters => _numTypeParameters ??= 0;
+
+  /**
+   * If the entity being referred to is generic, the number of type parameters
+   * it declares (does not include type parameters of enclosing entities).
+   * Otherwise zero.
+   */
+  void set numTypeParameters(int value) {
+    assert(value == null || value >= 0);
+    this._numTypeParameters = value;
+  }
+
+  @override
+  int get unit => _unit ??= 0;
+
+  /**
+   * Integer index indicating which unit in the imported library contains the
+   * definition of the entity.  As with indices into [LinkedLibrary.units],
+   * zero represents the defining compilation unit, and nonzero values
+   * represent parts in the order of the corresponding `part` declarations.
+   *
+   * Zero if this entity is contained within another entity (e.g. a class
+   * member).
+   */
+  void set unit(int value) {
+    assert(value == null || value >= 0);
+    this._unit = value;
+  }
+
+  LinkedReferenceBuilder({int containingReference, int dependency, idl.ReferenceKind kind, int localIndex, String name, int numTypeParameters, int unit})
+    : _containingReference = containingReference,
+      _dependency = dependency,
+      _kind = kind,
+      _localIndex = localIndex,
+      _name = name,
+      _numTypeParameters = numTypeParameters,
+      _unit = unit;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addInt(this._unit ?? 0);
+    signature.addInt(this._dependency ?? 0);
+    signature.addInt(this._kind == null ? 0 : this._kind.index);
+    signature.addString(this._name ?? '');
+    signature.addInt(this._numTypeParameters ?? 0);
+    signature.addInt(this._containingReference ?? 0);
+    signature.addInt(this._localIndex ?? 0);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_name;
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    fbBuilder.startTable();
+    if (_containingReference != null && _containingReference != 0) {
+      fbBuilder.addUint32(5, _containingReference);
+    }
+    if (_dependency != null && _dependency != 0) {
+      fbBuilder.addUint32(1, _dependency);
+    }
+    if (_kind != null && _kind != idl.ReferenceKind.classOrEnum) {
+      fbBuilder.addUint8(2, _kind.index);
+    }
+    if (_localIndex != null && _localIndex != 0) {
+      fbBuilder.addUint32(6, _localIndex);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(3, offset_name);
+    }
+    if (_numTypeParameters != null && _numTypeParameters != 0) {
+      fbBuilder.addUint32(4, _numTypeParameters);
+    }
+    if (_unit != null && _unit != 0) {
+      fbBuilder.addUint32(0, _unit);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _LinkedReferenceReader extends fb.TableReader<_LinkedReferenceImpl> {
+  const _LinkedReferenceReader();
+
+  @override
+  _LinkedReferenceImpl createObject(fb.BufferContext bc, int offset) => new _LinkedReferenceImpl(bc, offset);
+}
+
+class _LinkedReferenceImpl extends Object with _LinkedReferenceMixin implements idl.LinkedReference {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _LinkedReferenceImpl(this._bc, this._bcOffset);
+
+  int _containingReference;
+  int _dependency;
+  idl.ReferenceKind _kind;
+  int _localIndex;
+  String _name;
+  int _numTypeParameters;
+  int _unit;
+
+  @override
+  int get containingReference {
+    _containingReference ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 5, 0);
+    return _containingReference;
+  }
+
+  @override
+  int get dependency {
+    _dependency ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _dependency;
+  }
+
+  @override
+  idl.ReferenceKind get kind {
+    _kind ??= const _ReferenceKindReader().vTableGet(_bc, _bcOffset, 2, idl.ReferenceKind.classOrEnum);
+    return _kind;
+  }
+
+  @override
+  int get localIndex {
+    _localIndex ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 6, 0);
+    return _localIndex;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 3, '');
+    return _name;
+  }
+
+  @override
+  int get numTypeParameters {
+    _numTypeParameters ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 4, 0);
+    return _numTypeParameters;
+  }
+
+  @override
+  int get unit {
+    _unit ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 0, 0);
+    return _unit;
+  }
+}
+
+abstract class _LinkedReferenceMixin implements idl.LinkedReference {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (containingReference != 0) _result["containingReference"] = containingReference;
+    if (dependency != 0) _result["dependency"] = dependency;
+    if (kind != idl.ReferenceKind.classOrEnum) _result["kind"] = kind.toString().split('.')[1];
+    if (localIndex != 0) _result["localIndex"] = localIndex;
+    if (name != '') _result["name"] = name;
+    if (numTypeParameters != 0) _result["numTypeParameters"] = numTypeParameters;
+    if (unit != 0) _result["unit"] = unit;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "containingReference": containingReference,
+    "dependency": dependency,
+    "kind": kind,
+    "localIndex": localIndex,
+    "name": name,
+    "numTypeParameters": numTypeParameters,
+    "unit": unit,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class LinkedUnitBuilder extends Object with _LinkedUnitMixin implements idl.LinkedUnit {
+  List<int> _constCycles;
+  List<int> _parametersInheritingCovariant;
+  List<LinkedReferenceBuilder> _references;
+  List<EntityRefBuilder> _types;
+
+  @override
+  List<int> get constCycles => _constCycles ??= <int>[];
+
+  /**
+   * List of slot ids (referring to [UnlinkedExecutable.constCycleSlot])
+   * corresponding to const constructors that are part of cycles.
+   */
+  void set constCycles(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._constCycles = value;
+  }
+
+  @override
+  List<int> get parametersInheritingCovariant => _parametersInheritingCovariant ??= <int>[];
+
+  /**
+   * List of slot ids (referring to [UnlinkedParam.inheritsCovariantSlot])
+   * corresponding to parameters that inherit `@covariant` behavior from a base
+   * class.
+   */
+  void set parametersInheritingCovariant(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._parametersInheritingCovariant = value;
+  }
+
+  @override
+  List<LinkedReferenceBuilder> get references => _references ??= <LinkedReferenceBuilder>[];
+
+  /**
+   * Information about the resolution of references within the compilation
+   * unit.  Each element of [UnlinkedUnit.references] has a corresponding
+   * element in this list (at the same index).  If this list has additional
+   * elements beyond the number of elements in [UnlinkedUnit.references], those
+   * additional elements are references that are only referred to implicitly
+   * (e.g. elements involved in inferred or propagated types).
+   */
+  void set references(List<LinkedReferenceBuilder> value) {
+    this._references = value;
+  }
+
+  @override
+  List<EntityRefBuilder> get types => _types ??= <EntityRefBuilder>[];
+
+  /**
+   * List associating slot ids found inside the unlinked summary for the
+   * compilation unit with propagated and inferred types.
+   */
+  void set types(List<EntityRefBuilder> value) {
+    this._types = value;
+  }
+
+  LinkedUnitBuilder({List<int> constCycles, List<int> parametersInheritingCovariant, List<LinkedReferenceBuilder> references, List<EntityRefBuilder> types})
+    : _constCycles = constCycles,
+      _parametersInheritingCovariant = parametersInheritingCovariant,
+      _references = references,
+      _types = types;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _references?.forEach((b) => b.flushInformative());
+    _types?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    if (this._references == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._references.length);
+      for (var x in this._references) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._types == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._types.length);
+      for (var x in this._types) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._constCycles == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._constCycles.length);
+      for (var x in this._constCycles) {
+        signature.addInt(x);
+      }
+    }
+    if (this._parametersInheritingCovariant == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._parametersInheritingCovariant.length);
+      for (var x in this._parametersInheritingCovariant) {
+        signature.addInt(x);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_constCycles;
+    fb.Offset offset_parametersInheritingCovariant;
+    fb.Offset offset_references;
+    fb.Offset offset_types;
+    if (!(_constCycles == null || _constCycles.isEmpty)) {
+      offset_constCycles = fbBuilder.writeListUint32(_constCycles);
+    }
+    if (!(_parametersInheritingCovariant == null || _parametersInheritingCovariant.isEmpty)) {
+      offset_parametersInheritingCovariant = fbBuilder.writeListUint32(_parametersInheritingCovariant);
+    }
+    if (!(_references == null || _references.isEmpty)) {
+      offset_references = fbBuilder.writeList(_references.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_types == null || _types.isEmpty)) {
+      offset_types = fbBuilder.writeList(_types.map((b) => b.finish(fbBuilder)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_constCycles != null) {
+      fbBuilder.addOffset(2, offset_constCycles);
+    }
+    if (offset_parametersInheritingCovariant != null) {
+      fbBuilder.addOffset(3, offset_parametersInheritingCovariant);
+    }
+    if (offset_references != null) {
+      fbBuilder.addOffset(0, offset_references);
+    }
+    if (offset_types != null) {
+      fbBuilder.addOffset(1, offset_types);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _LinkedUnitReader extends fb.TableReader<_LinkedUnitImpl> {
+  const _LinkedUnitReader();
+
+  @override
+  _LinkedUnitImpl createObject(fb.BufferContext bc, int offset) => new _LinkedUnitImpl(bc, offset);
+}
+
+class _LinkedUnitImpl extends Object with _LinkedUnitMixin implements idl.LinkedUnit {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _LinkedUnitImpl(this._bc, this._bcOffset);
+
+  List<int> _constCycles;
+  List<int> _parametersInheritingCovariant;
+  List<idl.LinkedReference> _references;
+  List<idl.EntityRef> _types;
+
+  @override
+  List<int> get constCycles {
+    _constCycles ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 2, const <int>[]);
+    return _constCycles;
+  }
+
+  @override
+  List<int> get parametersInheritingCovariant {
+    _parametersInheritingCovariant ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 3, const <int>[]);
+    return _parametersInheritingCovariant;
+  }
+
+  @override
+  List<idl.LinkedReference> get references {
+    _references ??= const fb.ListReader<idl.LinkedReference>(const _LinkedReferenceReader()).vTableGet(_bc, _bcOffset, 0, const <idl.LinkedReference>[]);
+    return _references;
+  }
+
+  @override
+  List<idl.EntityRef> get types {
+    _types ??= const fb.ListReader<idl.EntityRef>(const _EntityRefReader()).vTableGet(_bc, _bcOffset, 1, const <idl.EntityRef>[]);
+    return _types;
+  }
+}
+
+abstract class _LinkedUnitMixin implements idl.LinkedUnit {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (constCycles.isNotEmpty) _result["constCycles"] = constCycles;
+    if (parametersInheritingCovariant.isNotEmpty) _result["parametersInheritingCovariant"] = parametersInheritingCovariant;
+    if (references.isNotEmpty) _result["references"] = references.map((_value) => _value.toJson()).toList();
+    if (types.isNotEmpty) _result["types"] = types.map((_value) => _value.toJson()).toList();
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "constCycles": constCycles,
+    "parametersInheritingCovariant": parametersInheritingCovariant,
+    "references": references,
+    "types": types,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class PackageBundleBuilder extends Object with _PackageBundleMixin implements idl.PackageBundle {
+  String _apiSignature;
+  List<PackageDependencyInfoBuilder> _dependencies;
+  List<LinkedLibraryBuilder> _linkedLibraries;
+  List<String> _linkedLibraryUris;
+  int _majorVersion;
+  int _minorVersion;
+  List<String> _unlinkedUnitHashes;
+  List<UnlinkedUnitBuilder> _unlinkedUnits;
+  List<String> _unlinkedUnitUris;
+
+  @override
+  String get apiSignature => _apiSignature ??= '';
+
+  /**
+   * MD5 hash of the non-informative fields of the [PackageBundle] (not
+   * including this one).  This can be used to identify when the API of a
+   * package may have changed.
+   */
+  void set apiSignature(String value) {
+    this._apiSignature = value;
+  }
+
+  @override
+  List<PackageDependencyInfoBuilder> get dependencies => _dependencies ??= <PackageDependencyInfoBuilder>[];
+
+  /**
+   * Information about the packages this package depends on, if known.
+   */
+  void set dependencies(List<PackageDependencyInfoBuilder> value) {
+    this._dependencies = value;
+  }
+
+  @override
+  List<LinkedLibraryBuilder> get linkedLibraries => _linkedLibraries ??= <LinkedLibraryBuilder>[];
+
+  /**
+   * Linked libraries.
+   */
+  void set linkedLibraries(List<LinkedLibraryBuilder> value) {
+    this._linkedLibraries = value;
+  }
+
+  @override
+  List<String> get linkedLibraryUris => _linkedLibraryUris ??= <String>[];
+
+  /**
+   * The list of URIs of items in [linkedLibraries], e.g. `dart:core` or
+   * `package:foo/bar.dart`.
+   */
+  void set linkedLibraryUris(List<String> value) {
+    this._linkedLibraryUris = value;
+  }
+
+  @override
+  int get majorVersion => _majorVersion ??= 0;
+
+  /**
+   * Major version of the summary format.  See
+   * [PackageBundleAssembler.currentMajorVersion].
+   */
+  void set majorVersion(int value) {
+    assert(value == null || value >= 0);
+    this._majorVersion = value;
+  }
+
+  @override
+  int get minorVersion => _minorVersion ??= 0;
+
+  /**
+   * Minor version of the summary format.  See
+   * [PackageBundleAssembler.currentMinorVersion].
+   */
+  void set minorVersion(int value) {
+    assert(value == null || value >= 0);
+    this._minorVersion = value;
+  }
+
+  @override
+  List<String> get unlinkedUnitHashes => _unlinkedUnitHashes ??= <String>[];
+
+  /**
+   * List of MD5 hashes of the files listed in [unlinkedUnitUris].  Each hash
+   * is encoded as a hexadecimal string using lower case letters.
+   */
+  void set unlinkedUnitHashes(List<String> value) {
+    this._unlinkedUnitHashes = value;
+  }
+
+  @override
+  List<UnlinkedUnitBuilder> get unlinkedUnits => _unlinkedUnits ??= <UnlinkedUnitBuilder>[];
+
+  /**
+   * Unlinked information for the compilation units constituting the package.
+   */
+  void set unlinkedUnits(List<UnlinkedUnitBuilder> value) {
+    this._unlinkedUnits = value;
+  }
+
+  @override
+  List<String> get unlinkedUnitUris => _unlinkedUnitUris ??= <String>[];
+
+  /**
+   * The list of URIs of items in [unlinkedUnits], e.g. `dart:core/bool.dart`.
+   */
+  void set unlinkedUnitUris(List<String> value) {
+    this._unlinkedUnitUris = value;
+  }
+
+  PackageBundleBuilder({String apiSignature, List<PackageDependencyInfoBuilder> dependencies, List<LinkedLibraryBuilder> linkedLibraries, List<String> linkedLibraryUris, int majorVersion, int minorVersion, List<String> unlinkedUnitHashes, List<UnlinkedUnitBuilder> unlinkedUnits, List<String> unlinkedUnitUris})
+    : _apiSignature = apiSignature,
+      _dependencies = dependencies,
+      _linkedLibraries = linkedLibraries,
+      _linkedLibraryUris = linkedLibraryUris,
+      _majorVersion = majorVersion,
+      _minorVersion = minorVersion,
+      _unlinkedUnitHashes = unlinkedUnitHashes,
+      _unlinkedUnits = unlinkedUnits,
+      _unlinkedUnitUris = unlinkedUnitUris;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _dependencies = null;
+    _linkedLibraries?.forEach((b) => b.flushInformative());
+    _unlinkedUnitHashes = null;
+    _unlinkedUnits?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    if (this._linkedLibraries == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._linkedLibraries.length);
+      for (var x in this._linkedLibraries) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._linkedLibraryUris == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._linkedLibraryUris.length);
+      for (var x in this._linkedLibraryUris) {
+        signature.addString(x);
+      }
+    }
+    if (this._unlinkedUnits == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._unlinkedUnits.length);
+      for (var x in this._unlinkedUnits) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._unlinkedUnitUris == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._unlinkedUnitUris.length);
+      for (var x in this._unlinkedUnitUris) {
+        signature.addString(x);
+      }
+    }
+    signature.addInt(this._majorVersion ?? 0);
+    signature.addInt(this._minorVersion ?? 0);
+    signature.addString(this._apiSignature ?? '');
+  }
+
+  List<int> toBuffer() {
+    fb.Builder fbBuilder = new fb.Builder();
+    return fbBuilder.finish(finish(fbBuilder), "PBdl");
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_apiSignature;
+    fb.Offset offset_dependencies;
+    fb.Offset offset_linkedLibraries;
+    fb.Offset offset_linkedLibraryUris;
+    fb.Offset offset_unlinkedUnitHashes;
+    fb.Offset offset_unlinkedUnits;
+    fb.Offset offset_unlinkedUnitUris;
+    if (_apiSignature != null) {
+      offset_apiSignature = fbBuilder.writeString(_apiSignature);
+    }
+    if (!(_dependencies == null || _dependencies.isEmpty)) {
+      offset_dependencies = fbBuilder.writeList(_dependencies.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_linkedLibraries == null || _linkedLibraries.isEmpty)) {
+      offset_linkedLibraries = fbBuilder.writeList(_linkedLibraries.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_linkedLibraryUris == null || _linkedLibraryUris.isEmpty)) {
+      offset_linkedLibraryUris = fbBuilder.writeList(_linkedLibraryUris.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    if (!(_unlinkedUnitHashes == null || _unlinkedUnitHashes.isEmpty)) {
+      offset_unlinkedUnitHashes = fbBuilder.writeList(_unlinkedUnitHashes.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    if (!(_unlinkedUnits == null || _unlinkedUnits.isEmpty)) {
+      offset_unlinkedUnits = fbBuilder.writeList(_unlinkedUnits.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_unlinkedUnitUris == null || _unlinkedUnitUris.isEmpty)) {
+      offset_unlinkedUnitUris = fbBuilder.writeList(_unlinkedUnitUris.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_apiSignature != null) {
+      fbBuilder.addOffset(7, offset_apiSignature);
+    }
+    if (offset_dependencies != null) {
+      fbBuilder.addOffset(8, offset_dependencies);
+    }
+    if (offset_linkedLibraries != null) {
+      fbBuilder.addOffset(0, offset_linkedLibraries);
+    }
+    if (offset_linkedLibraryUris != null) {
+      fbBuilder.addOffset(1, offset_linkedLibraryUris);
+    }
+    if (_majorVersion != null && _majorVersion != 0) {
+      fbBuilder.addUint32(5, _majorVersion);
+    }
+    if (_minorVersion != null && _minorVersion != 0) {
+      fbBuilder.addUint32(6, _minorVersion);
+    }
+    if (offset_unlinkedUnitHashes != null) {
+      fbBuilder.addOffset(4, offset_unlinkedUnitHashes);
+    }
+    if (offset_unlinkedUnits != null) {
+      fbBuilder.addOffset(2, offset_unlinkedUnits);
+    }
+    if (offset_unlinkedUnitUris != null) {
+      fbBuilder.addOffset(3, offset_unlinkedUnitUris);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+idl.PackageBundle readPackageBundle(List<int> buffer) {
+  fb.BufferContext rootRef = new fb.BufferContext.fromBytes(buffer);
+  return const _PackageBundleReader().read(rootRef, 0);
+}
+
+class _PackageBundleReader extends fb.TableReader<_PackageBundleImpl> {
+  const _PackageBundleReader();
+
+  @override
+  _PackageBundleImpl createObject(fb.BufferContext bc, int offset) => new _PackageBundleImpl(bc, offset);
+}
+
+class _PackageBundleImpl extends Object with _PackageBundleMixin implements idl.PackageBundle {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _PackageBundleImpl(this._bc, this._bcOffset);
+
+  String _apiSignature;
+  List<idl.PackageDependencyInfo> _dependencies;
+  List<idl.LinkedLibrary> _linkedLibraries;
+  List<String> _linkedLibraryUris;
+  int _majorVersion;
+  int _minorVersion;
+  List<String> _unlinkedUnitHashes;
+  List<idl.UnlinkedUnit> _unlinkedUnits;
+  List<String> _unlinkedUnitUris;
+
+  @override
+  String get apiSignature {
+    _apiSignature ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 7, '');
+    return _apiSignature;
+  }
+
+  @override
+  List<idl.PackageDependencyInfo> get dependencies {
+    _dependencies ??= const fb.ListReader<idl.PackageDependencyInfo>(const _PackageDependencyInfoReader()).vTableGet(_bc, _bcOffset, 8, const <idl.PackageDependencyInfo>[]);
+    return _dependencies;
+  }
+
+  @override
+  List<idl.LinkedLibrary> get linkedLibraries {
+    _linkedLibraries ??= const fb.ListReader<idl.LinkedLibrary>(const _LinkedLibraryReader()).vTableGet(_bc, _bcOffset, 0, const <idl.LinkedLibrary>[]);
+    return _linkedLibraries;
+  }
+
+  @override
+  List<String> get linkedLibraryUris {
+    _linkedLibraryUris ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 1, const <String>[]);
+    return _linkedLibraryUris;
+  }
+
+  @override
+  int get majorVersion {
+    _majorVersion ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 5, 0);
+    return _majorVersion;
+  }
+
+  @override
+  int get minorVersion {
+    _minorVersion ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 6, 0);
+    return _minorVersion;
+  }
+
+  @override
+  List<String> get unlinkedUnitHashes {
+    _unlinkedUnitHashes ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 4, const <String>[]);
+    return _unlinkedUnitHashes;
+  }
+
+  @override
+  List<idl.UnlinkedUnit> get unlinkedUnits {
+    _unlinkedUnits ??= const fb.ListReader<idl.UnlinkedUnit>(const _UnlinkedUnitReader()).vTableGet(_bc, _bcOffset, 2, const <idl.UnlinkedUnit>[]);
+    return _unlinkedUnits;
+  }
+
+  @override
+  List<String> get unlinkedUnitUris {
+    _unlinkedUnitUris ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 3, const <String>[]);
+    return _unlinkedUnitUris;
+  }
+}
+
+abstract class _PackageBundleMixin implements idl.PackageBundle {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (apiSignature != '') _result["apiSignature"] = apiSignature;
+    if (dependencies.isNotEmpty) _result["dependencies"] = dependencies.map((_value) => _value.toJson()).toList();
+    if (linkedLibraries.isNotEmpty) _result["linkedLibraries"] = linkedLibraries.map((_value) => _value.toJson()).toList();
+    if (linkedLibraryUris.isNotEmpty) _result["linkedLibraryUris"] = linkedLibraryUris;
+    if (majorVersion != 0) _result["majorVersion"] = majorVersion;
+    if (minorVersion != 0) _result["minorVersion"] = minorVersion;
+    if (unlinkedUnitHashes.isNotEmpty) _result["unlinkedUnitHashes"] = unlinkedUnitHashes;
+    if (unlinkedUnits.isNotEmpty) _result["unlinkedUnits"] = unlinkedUnits.map((_value) => _value.toJson()).toList();
+    if (unlinkedUnitUris.isNotEmpty) _result["unlinkedUnitUris"] = unlinkedUnitUris;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "apiSignature": apiSignature,
+    "dependencies": dependencies,
+    "linkedLibraries": linkedLibraries,
+    "linkedLibraryUris": linkedLibraryUris,
+    "majorVersion": majorVersion,
+    "minorVersion": minorVersion,
+    "unlinkedUnitHashes": unlinkedUnitHashes,
+    "unlinkedUnits": unlinkedUnits,
+    "unlinkedUnitUris": unlinkedUnitUris,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class PackageDependencyInfoBuilder extends Object with _PackageDependencyInfoMixin implements idl.PackageDependencyInfo {
+  String _apiSignature;
+  List<String> _includedPackageNames;
+  bool _includesDartUris;
+  bool _includesFileUris;
+  String _summaryPath;
+
+  @override
+  String get apiSignature => _apiSignature ??= '';
+
+  /**
+   * API signature of this dependency.
+   */
+  void set apiSignature(String value) {
+    this._apiSignature = value;
+  }
+
+  @override
+  List<String> get includedPackageNames => _includedPackageNames ??= <String>[];
+
+  /**
+   * If this dependency summarizes any files whose URI takes the form
+   * "package:<package_name>/...", a list of all such package names, sorted
+   * lexicographically.  Otherwise empty.
+   */
+  void set includedPackageNames(List<String> value) {
+    this._includedPackageNames = value;
+  }
+
+  @override
+  bool get includesDartUris => _includesDartUris ??= false;
+
+  /**
+   * Indicates whether this dependency summarizes any files whose URI takes the
+   * form "dart:...".
+   */
+  void set includesDartUris(bool value) {
+    this._includesDartUris = value;
+  }
+
+  @override
+  bool get includesFileUris => _includesFileUris ??= false;
+
+  /**
+   * Indicates whether this dependency summarizes any files whose URI takes the
+   * form "file:...".
+   */
+  void set includesFileUris(bool value) {
+    this._includesFileUris = value;
+  }
+
+  @override
+  String get summaryPath => _summaryPath ??= '';
+
+  /**
+   * Relative path to the summary file for this dependency.  This is intended as
+   * a hint to help the analysis server locate summaries of dependencies.  We
+   * don't specify precisely what this path is relative to, but we expect it to
+   * be relative to a directory the analysis server can find (e.g. for projects
+   * built using Bazel, it would be relative to the "bazel-bin" directory).
+   *
+   * Absent if the path is not known.
+   */
+  void set summaryPath(String value) {
+    this._summaryPath = value;
+  }
+
+  PackageDependencyInfoBuilder({String apiSignature, List<String> includedPackageNames, bool includesDartUris, bool includesFileUris, String summaryPath})
+    : _apiSignature = apiSignature,
+      _includedPackageNames = includedPackageNames,
+      _includesDartUris = includesDartUris,
+      _includesFileUris = includesFileUris,
+      _summaryPath = summaryPath;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._apiSignature ?? '');
+    signature.addString(this._summaryPath ?? '');
+    if (this._includedPackageNames == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._includedPackageNames.length);
+      for (var x in this._includedPackageNames) {
+        signature.addString(x);
+      }
+    }
+    signature.addBool(this._includesFileUris == true);
+    signature.addBool(this._includesDartUris == true);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_apiSignature;
+    fb.Offset offset_includedPackageNames;
+    fb.Offset offset_summaryPath;
+    if (_apiSignature != null) {
+      offset_apiSignature = fbBuilder.writeString(_apiSignature);
+    }
+    if (!(_includedPackageNames == null || _includedPackageNames.isEmpty)) {
+      offset_includedPackageNames = fbBuilder.writeList(_includedPackageNames.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    if (_summaryPath != null) {
+      offset_summaryPath = fbBuilder.writeString(_summaryPath);
+    }
+    fbBuilder.startTable();
+    if (offset_apiSignature != null) {
+      fbBuilder.addOffset(0, offset_apiSignature);
+    }
+    if (offset_includedPackageNames != null) {
+      fbBuilder.addOffset(2, offset_includedPackageNames);
+    }
+    if (_includesDartUris == true) {
+      fbBuilder.addBool(4, true);
+    }
+    if (_includesFileUris == true) {
+      fbBuilder.addBool(3, true);
+    }
+    if (offset_summaryPath != null) {
+      fbBuilder.addOffset(1, offset_summaryPath);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _PackageDependencyInfoReader extends fb.TableReader<_PackageDependencyInfoImpl> {
+  const _PackageDependencyInfoReader();
+
+  @override
+  _PackageDependencyInfoImpl createObject(fb.BufferContext bc, int offset) => new _PackageDependencyInfoImpl(bc, offset);
+}
+
+class _PackageDependencyInfoImpl extends Object with _PackageDependencyInfoMixin implements idl.PackageDependencyInfo {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _PackageDependencyInfoImpl(this._bc, this._bcOffset);
+
+  String _apiSignature;
+  List<String> _includedPackageNames;
+  bool _includesDartUris;
+  bool _includesFileUris;
+  String _summaryPath;
+
+  @override
+  String get apiSignature {
+    _apiSignature ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _apiSignature;
+  }
+
+  @override
+  List<String> get includedPackageNames {
+    _includedPackageNames ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 2, const <String>[]);
+    return _includedPackageNames;
+  }
+
+  @override
+  bool get includesDartUris {
+    _includesDartUris ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 4, false);
+    return _includesDartUris;
+  }
+
+  @override
+  bool get includesFileUris {
+    _includesFileUris ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 3, false);
+    return _includesFileUris;
+  }
+
+  @override
+  String get summaryPath {
+    _summaryPath ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 1, '');
+    return _summaryPath;
+  }
+}
+
+abstract class _PackageDependencyInfoMixin implements idl.PackageDependencyInfo {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (apiSignature != '') _result["apiSignature"] = apiSignature;
+    if (includedPackageNames.isNotEmpty) _result["includedPackageNames"] = includedPackageNames;
+    if (includesDartUris != false) _result["includesDartUris"] = includesDartUris;
+    if (includesFileUris != false) _result["includesFileUris"] = includesFileUris;
+    if (summaryPath != '') _result["summaryPath"] = summaryPath;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "apiSignature": apiSignature,
+    "includedPackageNames": includedPackageNames,
+    "includesDartUris": includesDartUris,
+    "includesFileUris": includesFileUris,
+    "summaryPath": summaryPath,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class PackageIndexBuilder extends Object with _PackageIndexMixin implements idl.PackageIndex {
+  List<idl.IndexSyntheticElementKind> _elementKinds;
+  List<int> _elementNameClassMemberIds;
+  List<int> _elementNameParameterIds;
+  List<int> _elementNameUnitMemberIds;
+  List<int> _elementUnits;
+  List<String> _strings;
+  List<int> _unitLibraryUris;
+  List<UnitIndexBuilder> _units;
+  List<int> _unitUnitUris;
+
+  @override
+  List<idl.IndexSyntheticElementKind> get elementKinds => _elementKinds ??= <idl.IndexSyntheticElementKind>[];
+
+  /**
+   * Each item of this list corresponds to a unique referenced element.  It is
+   * the kind of the synthetic element.
+   */
+  void set elementKinds(List<idl.IndexSyntheticElementKind> value) {
+    this._elementKinds = value;
+  }
+
+  @override
+  List<int> get elementNameClassMemberIds => _elementNameClassMemberIds ??= <int>[];
+
+  /**
+   * Each item of this list corresponds to a unique referenced element.  It is
+   * the identifier of the class member element name, or `null` if the element is
+   * a top-level element.  The list is sorted in ascending order, so that the
+   * client can quickly check whether an element is referenced in this
+   * [PackageIndex].
+   */
+  void set elementNameClassMemberIds(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._elementNameClassMemberIds = value;
+  }
+
+  @override
+  List<int> get elementNameParameterIds => _elementNameParameterIds ??= <int>[];
+
+  /**
+   * Each item of this list corresponds to a unique referenced element.  It is
+   * the identifier of the named parameter name, or `null` if the element is not
+   * a named parameter.  The list is sorted in ascending order, so that the
+   * client can quickly check whether an element is referenced in this
+   * [PackageIndex].
+   */
+  void set elementNameParameterIds(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._elementNameParameterIds = value;
+  }
+
+  @override
+  List<int> get elementNameUnitMemberIds => _elementNameUnitMemberIds ??= <int>[];
+
+  /**
+   * Each item of this list corresponds to a unique referenced element.  It is
+   * the identifier of the top-level element name, or `null` if the element is
+   * the unit.  The list is sorted in ascending order, so that the client can
+   * quickly check whether an element is referenced in this [PackageIndex].
+   */
+  void set elementNameUnitMemberIds(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._elementNameUnitMemberIds = value;
+  }
+
+  @override
+  List<int> get elementUnits => _elementUnits ??= <int>[];
+
+  /**
+   * Each item of this list corresponds to a unique referenced element.  It is
+   * the index into [unitLibraryUris] and [unitUnitUris] for the library
+   * specific unit where the element is declared.
+   */
+  void set elementUnits(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._elementUnits = value;
+  }
+
+  @override
+  List<String> get strings => _strings ??= <String>[];
+
+  /**
+   * List of unique element strings used in this [PackageIndex].  The list is
+   * sorted in ascending order, so that the client can quickly check the
+   * presence of a string in this [PackageIndex].
+   */
+  void set strings(List<String> value) {
+    this._strings = value;
+  }
+
+  @override
+  List<int> get unitLibraryUris => _unitLibraryUris ??= <int>[];
+
+  /**
+   * Each item of this list corresponds to the library URI of a unique library
+   * specific unit referenced in the [PackageIndex].  It is an index into
+   * [strings] list.
+   */
+  void set unitLibraryUris(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._unitLibraryUris = value;
+  }
+
+  @override
+  List<UnitIndexBuilder> get units => _units ??= <UnitIndexBuilder>[];
+
+  /**
+   * List of indexes of each unit in this [PackageIndex].
+   */
+  void set units(List<UnitIndexBuilder> value) {
+    this._units = value;
+  }
+
+  @override
+  List<int> get unitUnitUris => _unitUnitUris ??= <int>[];
+
+  /**
+   * Each item of this list corresponds to the unit URI of a unique library
+   * specific unit referenced in the [PackageIndex].  It is an index into
+   * [strings] list.
+   */
+  void set unitUnitUris(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._unitUnitUris = value;
+  }
+
+  PackageIndexBuilder({List<idl.IndexSyntheticElementKind> elementKinds, List<int> elementNameClassMemberIds, List<int> elementNameParameterIds, List<int> elementNameUnitMemberIds, List<int> elementUnits, List<String> strings, List<int> unitLibraryUris, List<UnitIndexBuilder> units, List<int> unitUnitUris})
+    : _elementKinds = elementKinds,
+      _elementNameClassMemberIds = elementNameClassMemberIds,
+      _elementNameParameterIds = elementNameParameterIds,
+      _elementNameUnitMemberIds = elementNameUnitMemberIds,
+      _elementUnits = elementUnits,
+      _strings = strings,
+      _unitLibraryUris = unitLibraryUris,
+      _units = units,
+      _unitUnitUris = unitUnitUris;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _units?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    if (this._elementUnits == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._elementUnits.length);
+      for (var x in this._elementUnits) {
+        signature.addInt(x);
+      }
+    }
+    if (this._elementNameUnitMemberIds == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._elementNameUnitMemberIds.length);
+      for (var x in this._elementNameUnitMemberIds) {
+        signature.addInt(x);
+      }
+    }
+    if (this._unitLibraryUris == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._unitLibraryUris.length);
+      for (var x in this._unitLibraryUris) {
+        signature.addInt(x);
+      }
+    }
+    if (this._unitUnitUris == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._unitUnitUris.length);
+      for (var x in this._unitUnitUris) {
+        signature.addInt(x);
+      }
+    }
+    if (this._units == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._units.length);
+      for (var x in this._units) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._elementKinds == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._elementKinds.length);
+      for (var x in this._elementKinds) {
+        signature.addInt(x.index);
+      }
+    }
+    if (this._strings == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._strings.length);
+      for (var x in this._strings) {
+        signature.addString(x);
+      }
+    }
+    if (this._elementNameClassMemberIds == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._elementNameClassMemberIds.length);
+      for (var x in this._elementNameClassMemberIds) {
+        signature.addInt(x);
+      }
+    }
+    if (this._elementNameParameterIds == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._elementNameParameterIds.length);
+      for (var x in this._elementNameParameterIds) {
+        signature.addInt(x);
+      }
+    }
+  }
+
+  List<int> toBuffer() {
+    fb.Builder fbBuilder = new fb.Builder();
+    return fbBuilder.finish(finish(fbBuilder), "Indx");
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_elementKinds;
+    fb.Offset offset_elementNameClassMemberIds;
+    fb.Offset offset_elementNameParameterIds;
+    fb.Offset offset_elementNameUnitMemberIds;
+    fb.Offset offset_elementUnits;
+    fb.Offset offset_strings;
+    fb.Offset offset_unitLibraryUris;
+    fb.Offset offset_units;
+    fb.Offset offset_unitUnitUris;
+    if (!(_elementKinds == null || _elementKinds.isEmpty)) {
+      offset_elementKinds = fbBuilder.writeListUint8(_elementKinds.map((b) => b.index).toList());
+    }
+    if (!(_elementNameClassMemberIds == null || _elementNameClassMemberIds.isEmpty)) {
+      offset_elementNameClassMemberIds = fbBuilder.writeListUint32(_elementNameClassMemberIds);
+    }
+    if (!(_elementNameParameterIds == null || _elementNameParameterIds.isEmpty)) {
+      offset_elementNameParameterIds = fbBuilder.writeListUint32(_elementNameParameterIds);
+    }
+    if (!(_elementNameUnitMemberIds == null || _elementNameUnitMemberIds.isEmpty)) {
+      offset_elementNameUnitMemberIds = fbBuilder.writeListUint32(_elementNameUnitMemberIds);
+    }
+    if (!(_elementUnits == null || _elementUnits.isEmpty)) {
+      offset_elementUnits = fbBuilder.writeListUint32(_elementUnits);
+    }
+    if (!(_strings == null || _strings.isEmpty)) {
+      offset_strings = fbBuilder.writeList(_strings.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    if (!(_unitLibraryUris == null || _unitLibraryUris.isEmpty)) {
+      offset_unitLibraryUris = fbBuilder.writeListUint32(_unitLibraryUris);
+    }
+    if (!(_units == null || _units.isEmpty)) {
+      offset_units = fbBuilder.writeList(_units.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_unitUnitUris == null || _unitUnitUris.isEmpty)) {
+      offset_unitUnitUris = fbBuilder.writeListUint32(_unitUnitUris);
+    }
+    fbBuilder.startTable();
+    if (offset_elementKinds != null) {
+      fbBuilder.addOffset(5, offset_elementKinds);
+    }
+    if (offset_elementNameClassMemberIds != null) {
+      fbBuilder.addOffset(7, offset_elementNameClassMemberIds);
+    }
+    if (offset_elementNameParameterIds != null) {
+      fbBuilder.addOffset(8, offset_elementNameParameterIds);
+    }
+    if (offset_elementNameUnitMemberIds != null) {
+      fbBuilder.addOffset(1, offset_elementNameUnitMemberIds);
+    }
+    if (offset_elementUnits != null) {
+      fbBuilder.addOffset(0, offset_elementUnits);
+    }
+    if (offset_strings != null) {
+      fbBuilder.addOffset(6, offset_strings);
+    }
+    if (offset_unitLibraryUris != null) {
+      fbBuilder.addOffset(2, offset_unitLibraryUris);
+    }
+    if (offset_units != null) {
+      fbBuilder.addOffset(4, offset_units);
+    }
+    if (offset_unitUnitUris != null) {
+      fbBuilder.addOffset(3, offset_unitUnitUris);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+idl.PackageIndex readPackageIndex(List<int> buffer) {
+  fb.BufferContext rootRef = new fb.BufferContext.fromBytes(buffer);
+  return const _PackageIndexReader().read(rootRef, 0);
+}
+
+class _PackageIndexReader extends fb.TableReader<_PackageIndexImpl> {
+  const _PackageIndexReader();
+
+  @override
+  _PackageIndexImpl createObject(fb.BufferContext bc, int offset) => new _PackageIndexImpl(bc, offset);
+}
+
+class _PackageIndexImpl extends Object with _PackageIndexMixin implements idl.PackageIndex {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _PackageIndexImpl(this._bc, this._bcOffset);
+
+  List<idl.IndexSyntheticElementKind> _elementKinds;
+  List<int> _elementNameClassMemberIds;
+  List<int> _elementNameParameterIds;
+  List<int> _elementNameUnitMemberIds;
+  List<int> _elementUnits;
+  List<String> _strings;
+  List<int> _unitLibraryUris;
+  List<idl.UnitIndex> _units;
+  List<int> _unitUnitUris;
+
+  @override
+  List<idl.IndexSyntheticElementKind> get elementKinds {
+    _elementKinds ??= const fb.ListReader<idl.IndexSyntheticElementKind>(const _IndexSyntheticElementKindReader()).vTableGet(_bc, _bcOffset, 5, const <idl.IndexSyntheticElementKind>[]);
+    return _elementKinds;
+  }
+
+  @override
+  List<int> get elementNameClassMemberIds {
+    _elementNameClassMemberIds ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 7, const <int>[]);
+    return _elementNameClassMemberIds;
+  }
+
+  @override
+  List<int> get elementNameParameterIds {
+    _elementNameParameterIds ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 8, const <int>[]);
+    return _elementNameParameterIds;
+  }
+
+  @override
+  List<int> get elementNameUnitMemberIds {
+    _elementNameUnitMemberIds ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 1, const <int>[]);
+    return _elementNameUnitMemberIds;
+  }
+
+  @override
+  List<int> get elementUnits {
+    _elementUnits ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 0, const <int>[]);
+    return _elementUnits;
+  }
+
+  @override
+  List<String> get strings {
+    _strings ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 6, const <String>[]);
+    return _strings;
+  }
+
+  @override
+  List<int> get unitLibraryUris {
+    _unitLibraryUris ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 2, const <int>[]);
+    return _unitLibraryUris;
+  }
+
+  @override
+  List<idl.UnitIndex> get units {
+    _units ??= const fb.ListReader<idl.UnitIndex>(const _UnitIndexReader()).vTableGet(_bc, _bcOffset, 4, const <idl.UnitIndex>[]);
+    return _units;
+  }
+
+  @override
+  List<int> get unitUnitUris {
+    _unitUnitUris ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 3, const <int>[]);
+    return _unitUnitUris;
+  }
+}
+
+abstract class _PackageIndexMixin implements idl.PackageIndex {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (elementKinds.isNotEmpty) _result["elementKinds"] = elementKinds.map((_value) => _value.toString().split('.')[1]).toList();
+    if (elementNameClassMemberIds.isNotEmpty) _result["elementNameClassMemberIds"] = elementNameClassMemberIds;
+    if (elementNameParameterIds.isNotEmpty) _result["elementNameParameterIds"] = elementNameParameterIds;
+    if (elementNameUnitMemberIds.isNotEmpty) _result["elementNameUnitMemberIds"] = elementNameUnitMemberIds;
+    if (elementUnits.isNotEmpty) _result["elementUnits"] = elementUnits;
+    if (strings.isNotEmpty) _result["strings"] = strings;
+    if (unitLibraryUris.isNotEmpty) _result["unitLibraryUris"] = unitLibraryUris;
+    if (units.isNotEmpty) _result["units"] = units.map((_value) => _value.toJson()).toList();
+    if (unitUnitUris.isNotEmpty) _result["unitUnitUris"] = unitUnitUris;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "elementKinds": elementKinds,
+    "elementNameClassMemberIds": elementNameClassMemberIds,
+    "elementNameParameterIds": elementNameParameterIds,
+    "elementNameUnitMemberIds": elementNameUnitMemberIds,
+    "elementUnits": elementUnits,
+    "strings": strings,
+    "unitLibraryUris": unitLibraryUris,
+    "units": units,
+    "unitUnitUris": unitUnitUris,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnitIndexBuilder extends Object with _UnitIndexMixin implements idl.UnitIndex {
+  List<idl.IndexNameKind> _definedNameKinds;
+  List<int> _definedNameOffsets;
+  List<int> _definedNames;
+  int _unit;
+  List<bool> _usedElementIsQualifiedFlags;
+  List<idl.IndexRelationKind> _usedElementKinds;
+  List<int> _usedElementLengths;
+  List<int> _usedElementOffsets;
+  List<int> _usedElements;
+  List<bool> _usedNameIsQualifiedFlags;
+  List<idl.IndexRelationKind> _usedNameKinds;
+  List<int> _usedNameOffsets;
+  List<int> _usedNames;
+
+  @override
+  List<idl.IndexNameKind> get definedNameKinds => _definedNameKinds ??= <idl.IndexNameKind>[];
+
+  /**
+   * Each item of this list is the kind of an element defined in this unit.
+   */
+  void set definedNameKinds(List<idl.IndexNameKind> value) {
+    this._definedNameKinds = value;
+  }
+
+  @override
+  List<int> get definedNameOffsets => _definedNameOffsets ??= <int>[];
+
+  /**
+   * Each item of this list is the name offset of an element defined in this
+   * unit relative to the beginning of the file.
+   */
+  void set definedNameOffsets(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._definedNameOffsets = value;
+  }
+
+  @override
+  List<int> get definedNames => _definedNames ??= <int>[];
+
+  /**
+   * Each item of this list corresponds to an element defined in this unit.  It
+   * is an index into [PackageIndex.strings] list.  The list is sorted in
+   * ascending order, so that the client can quickly find name definitions in
+   * this [UnitIndex].
+   */
+  void set definedNames(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._definedNames = value;
+  }
+
+  @override
+  int get unit => _unit ??= 0;
+
+  /**
+   * Index into [PackageIndex.unitLibraryUris] and [PackageIndex.unitUnitUris]
+   * for the library specific unit that corresponds to this [UnitIndex].
+   */
+  void set unit(int value) {
+    assert(value == null || value >= 0);
+    this._unit = value;
+  }
+
+  @override
+  List<bool> get usedElementIsQualifiedFlags => _usedElementIsQualifiedFlags ??= <bool>[];
+
+  /**
+   * Each item of this list is the `true` if the corresponding element usage
+   * is qualified with some prefix.
+   */
+  void set usedElementIsQualifiedFlags(List<bool> value) {
+    this._usedElementIsQualifiedFlags = value;
+  }
+
+  @override
+  List<idl.IndexRelationKind> get usedElementKinds => _usedElementKinds ??= <idl.IndexRelationKind>[];
+
+  /**
+   * Each item of this list is the kind of the element usage.
+   */
+  void set usedElementKinds(List<idl.IndexRelationKind> value) {
+    this._usedElementKinds = value;
+  }
+
+  @override
+  List<int> get usedElementLengths => _usedElementLengths ??= <int>[];
+
+  /**
+   * Each item of this list is the length of the element usage.
+   */
+  void set usedElementLengths(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._usedElementLengths = value;
+  }
+
+  @override
+  List<int> get usedElementOffsets => _usedElementOffsets ??= <int>[];
+
+  /**
+   * Each item of this list is the offset of the element usage relative to the
+   * beginning of the file.
+   */
+  void set usedElementOffsets(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._usedElementOffsets = value;
+  }
+
+  @override
+  List<int> get usedElements => _usedElements ??= <int>[];
+
+  /**
+   * Each item of this list is the index into [PackageIndex.elementUnits] and
+   * [PackageIndex.elementOffsets].  The list is sorted in ascending order, so
+   * that the client can quickly find element references in this [UnitIndex].
+   */
+  void set usedElements(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._usedElements = value;
+  }
+
+  @override
+  List<bool> get usedNameIsQualifiedFlags => _usedNameIsQualifiedFlags ??= <bool>[];
+
+  /**
+   * Each item of this list is the `true` if the corresponding name usage
+   * is qualified with some prefix.
+   */
+  void set usedNameIsQualifiedFlags(List<bool> value) {
+    this._usedNameIsQualifiedFlags = value;
+  }
+
+  @override
+  List<idl.IndexRelationKind> get usedNameKinds => _usedNameKinds ??= <idl.IndexRelationKind>[];
+
+  /**
+   * Each item of this list is the kind of the name usage.
+   */
+  void set usedNameKinds(List<idl.IndexRelationKind> value) {
+    this._usedNameKinds = value;
+  }
+
+  @override
+  List<int> get usedNameOffsets => _usedNameOffsets ??= <int>[];
+
+  /**
+   * Each item of this list is the offset of the name usage relative to the
+   * beginning of the file.
+   */
+  void set usedNameOffsets(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._usedNameOffsets = value;
+  }
+
+  @override
+  List<int> get usedNames => _usedNames ??= <int>[];
+
+  /**
+   * Each item of this list is the index into [PackageIndex.strings] for a
+   * used name.  The list is sorted in ascending order, so that the client can
+   * quickly find name uses in this [UnitIndex].
+   */
+  void set usedNames(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._usedNames = value;
+  }
+
+  UnitIndexBuilder({List<idl.IndexNameKind> definedNameKinds, List<int> definedNameOffsets, List<int> definedNames, int unit, List<bool> usedElementIsQualifiedFlags, List<idl.IndexRelationKind> usedElementKinds, List<int> usedElementLengths, List<int> usedElementOffsets, List<int> usedElements, List<bool> usedNameIsQualifiedFlags, List<idl.IndexRelationKind> usedNameKinds, List<int> usedNameOffsets, List<int> usedNames})
+    : _definedNameKinds = definedNameKinds,
+      _definedNameOffsets = definedNameOffsets,
+      _definedNames = definedNames,
+      _unit = unit,
+      _usedElementIsQualifiedFlags = usedElementIsQualifiedFlags,
+      _usedElementKinds = usedElementKinds,
+      _usedElementLengths = usedElementLengths,
+      _usedElementOffsets = usedElementOffsets,
+      _usedElements = usedElements,
+      _usedNameIsQualifiedFlags = usedNameIsQualifiedFlags,
+      _usedNameKinds = usedNameKinds,
+      _usedNameOffsets = usedNameOffsets,
+      _usedNames = usedNames;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addInt(this._unit ?? 0);
+    if (this._usedElementLengths == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._usedElementLengths.length);
+      for (var x in this._usedElementLengths) {
+        signature.addInt(x);
+      }
+    }
+    if (this._usedElementOffsets == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._usedElementOffsets.length);
+      for (var x in this._usedElementOffsets) {
+        signature.addInt(x);
+      }
+    }
+    if (this._usedElements == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._usedElements.length);
+      for (var x in this._usedElements) {
+        signature.addInt(x);
+      }
+    }
+    if (this._usedElementKinds == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._usedElementKinds.length);
+      for (var x in this._usedElementKinds) {
+        signature.addInt(x.index);
+      }
+    }
+    if (this._definedNames == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._definedNames.length);
+      for (var x in this._definedNames) {
+        signature.addInt(x);
+      }
+    }
+    if (this._definedNameKinds == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._definedNameKinds.length);
+      for (var x in this._definedNameKinds) {
+        signature.addInt(x.index);
+      }
+    }
+    if (this._definedNameOffsets == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._definedNameOffsets.length);
+      for (var x in this._definedNameOffsets) {
+        signature.addInt(x);
+      }
+    }
+    if (this._usedNames == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._usedNames.length);
+      for (var x in this._usedNames) {
+        signature.addInt(x);
+      }
+    }
+    if (this._usedNameOffsets == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._usedNameOffsets.length);
+      for (var x in this._usedNameOffsets) {
+        signature.addInt(x);
+      }
+    }
+    if (this._usedNameKinds == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._usedNameKinds.length);
+      for (var x in this._usedNameKinds) {
+        signature.addInt(x.index);
+      }
+    }
+    if (this._usedElementIsQualifiedFlags == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._usedElementIsQualifiedFlags.length);
+      for (var x in this._usedElementIsQualifiedFlags) {
+        signature.addBool(x);
+      }
+    }
+    if (this._usedNameIsQualifiedFlags == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._usedNameIsQualifiedFlags.length);
+      for (var x in this._usedNameIsQualifiedFlags) {
+        signature.addBool(x);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_definedNameKinds;
+    fb.Offset offset_definedNameOffsets;
+    fb.Offset offset_definedNames;
+    fb.Offset offset_usedElementIsQualifiedFlags;
+    fb.Offset offset_usedElementKinds;
+    fb.Offset offset_usedElementLengths;
+    fb.Offset offset_usedElementOffsets;
+    fb.Offset offset_usedElements;
+    fb.Offset offset_usedNameIsQualifiedFlags;
+    fb.Offset offset_usedNameKinds;
+    fb.Offset offset_usedNameOffsets;
+    fb.Offset offset_usedNames;
+    if (!(_definedNameKinds == null || _definedNameKinds.isEmpty)) {
+      offset_definedNameKinds = fbBuilder.writeListUint8(_definedNameKinds.map((b) => b.index).toList());
+    }
+    if (!(_definedNameOffsets == null || _definedNameOffsets.isEmpty)) {
+      offset_definedNameOffsets = fbBuilder.writeListUint32(_definedNameOffsets);
+    }
+    if (!(_definedNames == null || _definedNames.isEmpty)) {
+      offset_definedNames = fbBuilder.writeListUint32(_definedNames);
+    }
+    if (!(_usedElementIsQualifiedFlags == null || _usedElementIsQualifiedFlags.isEmpty)) {
+      offset_usedElementIsQualifiedFlags = fbBuilder.writeListBool(_usedElementIsQualifiedFlags);
+    }
+    if (!(_usedElementKinds == null || _usedElementKinds.isEmpty)) {
+      offset_usedElementKinds = fbBuilder.writeListUint8(_usedElementKinds.map((b) => b.index).toList());
+    }
+    if (!(_usedElementLengths == null || _usedElementLengths.isEmpty)) {
+      offset_usedElementLengths = fbBuilder.writeListUint32(_usedElementLengths);
+    }
+    if (!(_usedElementOffsets == null || _usedElementOffsets.isEmpty)) {
+      offset_usedElementOffsets = fbBuilder.writeListUint32(_usedElementOffsets);
+    }
+    if (!(_usedElements == null || _usedElements.isEmpty)) {
+      offset_usedElements = fbBuilder.writeListUint32(_usedElements);
+    }
+    if (!(_usedNameIsQualifiedFlags == null || _usedNameIsQualifiedFlags.isEmpty)) {
+      offset_usedNameIsQualifiedFlags = fbBuilder.writeListBool(_usedNameIsQualifiedFlags);
+    }
+    if (!(_usedNameKinds == null || _usedNameKinds.isEmpty)) {
+      offset_usedNameKinds = fbBuilder.writeListUint8(_usedNameKinds.map((b) => b.index).toList());
+    }
+    if (!(_usedNameOffsets == null || _usedNameOffsets.isEmpty)) {
+      offset_usedNameOffsets = fbBuilder.writeListUint32(_usedNameOffsets);
+    }
+    if (!(_usedNames == null || _usedNames.isEmpty)) {
+      offset_usedNames = fbBuilder.writeListUint32(_usedNames);
+    }
+    fbBuilder.startTable();
+    if (offset_definedNameKinds != null) {
+      fbBuilder.addOffset(6, offset_definedNameKinds);
+    }
+    if (offset_definedNameOffsets != null) {
+      fbBuilder.addOffset(7, offset_definedNameOffsets);
+    }
+    if (offset_definedNames != null) {
+      fbBuilder.addOffset(5, offset_definedNames);
+    }
+    if (_unit != null && _unit != 0) {
+      fbBuilder.addUint32(0, _unit);
+    }
+    if (offset_usedElementIsQualifiedFlags != null) {
+      fbBuilder.addOffset(11, offset_usedElementIsQualifiedFlags);
+    }
+    if (offset_usedElementKinds != null) {
+      fbBuilder.addOffset(4, offset_usedElementKinds);
+    }
+    if (offset_usedElementLengths != null) {
+      fbBuilder.addOffset(1, offset_usedElementLengths);
+    }
+    if (offset_usedElementOffsets != null) {
+      fbBuilder.addOffset(2, offset_usedElementOffsets);
+    }
+    if (offset_usedElements != null) {
+      fbBuilder.addOffset(3, offset_usedElements);
+    }
+    if (offset_usedNameIsQualifiedFlags != null) {
+      fbBuilder.addOffset(12, offset_usedNameIsQualifiedFlags);
+    }
+    if (offset_usedNameKinds != null) {
+      fbBuilder.addOffset(10, offset_usedNameKinds);
+    }
+    if (offset_usedNameOffsets != null) {
+      fbBuilder.addOffset(9, offset_usedNameOffsets);
+    }
+    if (offset_usedNames != null) {
+      fbBuilder.addOffset(8, offset_usedNames);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnitIndexReader extends fb.TableReader<_UnitIndexImpl> {
+  const _UnitIndexReader();
+
+  @override
+  _UnitIndexImpl createObject(fb.BufferContext bc, int offset) => new _UnitIndexImpl(bc, offset);
+}
+
+class _UnitIndexImpl extends Object with _UnitIndexMixin implements idl.UnitIndex {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnitIndexImpl(this._bc, this._bcOffset);
+
+  List<idl.IndexNameKind> _definedNameKinds;
+  List<int> _definedNameOffsets;
+  List<int> _definedNames;
+  int _unit;
+  List<bool> _usedElementIsQualifiedFlags;
+  List<idl.IndexRelationKind> _usedElementKinds;
+  List<int> _usedElementLengths;
+  List<int> _usedElementOffsets;
+  List<int> _usedElements;
+  List<bool> _usedNameIsQualifiedFlags;
+  List<idl.IndexRelationKind> _usedNameKinds;
+  List<int> _usedNameOffsets;
+  List<int> _usedNames;
+
+  @override
+  List<idl.IndexNameKind> get definedNameKinds {
+    _definedNameKinds ??= const fb.ListReader<idl.IndexNameKind>(const _IndexNameKindReader()).vTableGet(_bc, _bcOffset, 6, const <idl.IndexNameKind>[]);
+    return _definedNameKinds;
+  }
+
+  @override
+  List<int> get definedNameOffsets {
+    _definedNameOffsets ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 7, const <int>[]);
+    return _definedNameOffsets;
+  }
+
+  @override
+  List<int> get definedNames {
+    _definedNames ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 5, const <int>[]);
+    return _definedNames;
+  }
+
+  @override
+  int get unit {
+    _unit ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 0, 0);
+    return _unit;
+  }
+
+  @override
+  List<bool> get usedElementIsQualifiedFlags {
+    _usedElementIsQualifiedFlags ??= const fb.BoolListReader().vTableGet(_bc, _bcOffset, 11, const <bool>[]);
+    return _usedElementIsQualifiedFlags;
+  }
+
+  @override
+  List<idl.IndexRelationKind> get usedElementKinds {
+    _usedElementKinds ??= const fb.ListReader<idl.IndexRelationKind>(const _IndexRelationKindReader()).vTableGet(_bc, _bcOffset, 4, const <idl.IndexRelationKind>[]);
+    return _usedElementKinds;
+  }
+
+  @override
+  List<int> get usedElementLengths {
+    _usedElementLengths ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 1, const <int>[]);
+    return _usedElementLengths;
+  }
+
+  @override
+  List<int> get usedElementOffsets {
+    _usedElementOffsets ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 2, const <int>[]);
+    return _usedElementOffsets;
+  }
+
+  @override
+  List<int> get usedElements {
+    _usedElements ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 3, const <int>[]);
+    return _usedElements;
+  }
+
+  @override
+  List<bool> get usedNameIsQualifiedFlags {
+    _usedNameIsQualifiedFlags ??= const fb.BoolListReader().vTableGet(_bc, _bcOffset, 12, const <bool>[]);
+    return _usedNameIsQualifiedFlags;
+  }
+
+  @override
+  List<idl.IndexRelationKind> get usedNameKinds {
+    _usedNameKinds ??= const fb.ListReader<idl.IndexRelationKind>(const _IndexRelationKindReader()).vTableGet(_bc, _bcOffset, 10, const <idl.IndexRelationKind>[]);
+    return _usedNameKinds;
+  }
+
+  @override
+  List<int> get usedNameOffsets {
+    _usedNameOffsets ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 9, const <int>[]);
+    return _usedNameOffsets;
+  }
+
+  @override
+  List<int> get usedNames {
+    _usedNames ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 8, const <int>[]);
+    return _usedNames;
+  }
+}
+
+abstract class _UnitIndexMixin implements idl.UnitIndex {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (definedNameKinds.isNotEmpty) _result["definedNameKinds"] = definedNameKinds.map((_value) => _value.toString().split('.')[1]).toList();
+    if (definedNameOffsets.isNotEmpty) _result["definedNameOffsets"] = definedNameOffsets;
+    if (definedNames.isNotEmpty) _result["definedNames"] = definedNames;
+    if (unit != 0) _result["unit"] = unit;
+    if (usedElementIsQualifiedFlags.isNotEmpty) _result["usedElementIsQualifiedFlags"] = usedElementIsQualifiedFlags;
+    if (usedElementKinds.isNotEmpty) _result["usedElementKinds"] = usedElementKinds.map((_value) => _value.toString().split('.')[1]).toList();
+    if (usedElementLengths.isNotEmpty) _result["usedElementLengths"] = usedElementLengths;
+    if (usedElementOffsets.isNotEmpty) _result["usedElementOffsets"] = usedElementOffsets;
+    if (usedElements.isNotEmpty) _result["usedElements"] = usedElements;
+    if (usedNameIsQualifiedFlags.isNotEmpty) _result["usedNameIsQualifiedFlags"] = usedNameIsQualifiedFlags;
+    if (usedNameKinds.isNotEmpty) _result["usedNameKinds"] = usedNameKinds.map((_value) => _value.toString().split('.')[1]).toList();
+    if (usedNameOffsets.isNotEmpty) _result["usedNameOffsets"] = usedNameOffsets;
+    if (usedNames.isNotEmpty) _result["usedNames"] = usedNames;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "definedNameKinds": definedNameKinds,
+    "definedNameOffsets": definedNameOffsets,
+    "definedNames": definedNames,
+    "unit": unit,
+    "usedElementIsQualifiedFlags": usedElementIsQualifiedFlags,
+    "usedElementKinds": usedElementKinds,
+    "usedElementLengths": usedElementLengths,
+    "usedElementOffsets": usedElementOffsets,
+    "usedElements": usedElements,
+    "usedNameIsQualifiedFlags": usedNameIsQualifiedFlags,
+    "usedNameKinds": usedNameKinds,
+    "usedNameOffsets": usedNameOffsets,
+    "usedNames": usedNames,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedClassBuilder extends Object with _UnlinkedClassMixin implements idl.UnlinkedClass {
+  List<UnlinkedConstBuilder> _annotations;
+  CodeRangeBuilder _codeRange;
+  UnlinkedDocumentationCommentBuilder _documentationComment;
+  List<UnlinkedExecutableBuilder> _executables;
+  List<UnlinkedVariableBuilder> _fields;
+  bool _hasNoSupertype;
+  List<EntityRefBuilder> _interfaces;
+  bool _isAbstract;
+  bool _isMixinApplication;
+  List<EntityRefBuilder> _mixins;
+  String _name;
+  int _nameOffset;
+  EntityRefBuilder _supertype;
+  List<UnlinkedTypeParamBuilder> _typeParameters;
+
+  @override
+  List<UnlinkedConstBuilder> get annotations => _annotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for this class.
+   */
+  void set annotations(List<UnlinkedConstBuilder> value) {
+    this._annotations = value;
+  }
+
+  @override
+  CodeRangeBuilder get codeRange => _codeRange;
+
+  /**
+   * Code range of the class.
+   */
+  void set codeRange(CodeRangeBuilder value) {
+    this._codeRange = value;
+  }
+
+  @override
+  UnlinkedDocumentationCommentBuilder get documentationComment => _documentationComment;
+
+  /**
+   * Documentation comment for the class, or `null` if there is no
+   * documentation comment.
+   */
+  void set documentationComment(UnlinkedDocumentationCommentBuilder value) {
+    this._documentationComment = value;
+  }
+
+  @override
+  List<UnlinkedExecutableBuilder> get executables => _executables ??= <UnlinkedExecutableBuilder>[];
+
+  /**
+   * Executable objects (methods, getters, and setters) contained in the class.
+   */
+  void set executables(List<UnlinkedExecutableBuilder> value) {
+    this._executables = value;
+  }
+
+  @override
+  List<UnlinkedVariableBuilder> get fields => _fields ??= <UnlinkedVariableBuilder>[];
+
+  /**
+   * Field declarations contained in the class.
+   */
+  void set fields(List<UnlinkedVariableBuilder> value) {
+    this._fields = value;
+  }
+
+  @override
+  bool get hasNoSupertype => _hasNoSupertype ??= false;
+
+  /**
+   * Indicates whether this class is the core "Object" class (and hence has no
+   * supertype)
+   */
+  void set hasNoSupertype(bool value) {
+    this._hasNoSupertype = value;
+  }
+
+  @override
+  List<EntityRefBuilder> get interfaces => _interfaces ??= <EntityRefBuilder>[];
+
+  /**
+   * Interfaces appearing in an `implements` clause, if any.
+   */
+  void set interfaces(List<EntityRefBuilder> value) {
+    this._interfaces = value;
+  }
+
+  @override
+  bool get isAbstract => _isAbstract ??= false;
+
+  /**
+   * Indicates whether the class is declared with the `abstract` keyword.
+   */
+  void set isAbstract(bool value) {
+    this._isAbstract = value;
+  }
+
+  @override
+  bool get isMixinApplication => _isMixinApplication ??= false;
+
+  /**
+   * Indicates whether the class is declared using mixin application syntax.
+   */
+  void set isMixinApplication(bool value) {
+    this._isMixinApplication = value;
+  }
+
+  @override
+  List<EntityRefBuilder> get mixins => _mixins ??= <EntityRefBuilder>[];
+
+  /**
+   * Mixins appearing in a `with` clause, if any.
+   */
+  void set mixins(List<EntityRefBuilder> value) {
+    this._mixins = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the class.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get nameOffset => _nameOffset ??= 0;
+
+  /**
+   * Offset of the class name relative to the beginning of the file.
+   */
+  void set nameOffset(int value) {
+    assert(value == null || value >= 0);
+    this._nameOffset = value;
+  }
+
+  @override
+  EntityRefBuilder get supertype => _supertype;
+
+  /**
+   * Supertype of the class, or `null` if either (a) the class doesn't
+   * explicitly declare a supertype (and hence has supertype `Object`), or (b)
+   * the class *is* `Object` (and hence has no supertype).
+   */
+  void set supertype(EntityRefBuilder value) {
+    this._supertype = value;
+  }
+
+  @override
+  List<UnlinkedTypeParamBuilder> get typeParameters => _typeParameters ??= <UnlinkedTypeParamBuilder>[];
+
+  /**
+   * Type parameters of the class, if any.
+   */
+  void set typeParameters(List<UnlinkedTypeParamBuilder> value) {
+    this._typeParameters = value;
+  }
+
+  UnlinkedClassBuilder({List<UnlinkedConstBuilder> annotations, CodeRangeBuilder codeRange, UnlinkedDocumentationCommentBuilder documentationComment, List<UnlinkedExecutableBuilder> executables, List<UnlinkedVariableBuilder> fields, bool hasNoSupertype, List<EntityRefBuilder> interfaces, bool isAbstract, bool isMixinApplication, List<EntityRefBuilder> mixins, String name, int nameOffset, EntityRefBuilder supertype, List<UnlinkedTypeParamBuilder> typeParameters})
+    : _annotations = annotations,
+      _codeRange = codeRange,
+      _documentationComment = documentationComment,
+      _executables = executables,
+      _fields = fields,
+      _hasNoSupertype = hasNoSupertype,
+      _interfaces = interfaces,
+      _isAbstract = isAbstract,
+      _isMixinApplication = isMixinApplication,
+      _mixins = mixins,
+      _name = name,
+      _nameOffset = nameOffset,
+      _supertype = supertype,
+      _typeParameters = typeParameters;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _annotations?.forEach((b) => b.flushInformative());
+    _codeRange = null;
+    _documentationComment = null;
+    _executables?.forEach((b) => b.flushInformative());
+    _fields?.forEach((b) => b.flushInformative());
+    _interfaces?.forEach((b) => b.flushInformative());
+    _mixins?.forEach((b) => b.flushInformative());
+    _nameOffset = null;
+    _supertype?.flushInformative();
+    _typeParameters?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    if (this._executables == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._executables.length);
+      for (var x in this._executables) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addBool(this._supertype != null);
+    this._supertype?.collectApiSignature(signature);
+    if (this._fields == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._fields.length);
+      for (var x in this._fields) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._annotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._annotations.length);
+      for (var x in this._annotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._interfaces == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._interfaces.length);
+      for (var x in this._interfaces) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addBool(this._isAbstract == true);
+    if (this._typeParameters == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._typeParameters.length);
+      for (var x in this._typeParameters) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._mixins == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._mixins.length);
+      for (var x in this._mixins) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addBool(this._isMixinApplication == true);
+    signature.addBool(this._hasNoSupertype == true);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_annotations;
+    fb.Offset offset_codeRange;
+    fb.Offset offset_documentationComment;
+    fb.Offset offset_executables;
+    fb.Offset offset_fields;
+    fb.Offset offset_interfaces;
+    fb.Offset offset_mixins;
+    fb.Offset offset_name;
+    fb.Offset offset_supertype;
+    fb.Offset offset_typeParameters;
+    if (!(_annotations == null || _annotations.isEmpty)) {
+      offset_annotations = fbBuilder.writeList(_annotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_codeRange != null) {
+      offset_codeRange = _codeRange.finish(fbBuilder);
+    }
+    if (_documentationComment != null) {
+      offset_documentationComment = _documentationComment.finish(fbBuilder);
+    }
+    if (!(_executables == null || _executables.isEmpty)) {
+      offset_executables = fbBuilder.writeList(_executables.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_fields == null || _fields.isEmpty)) {
+      offset_fields = fbBuilder.writeList(_fields.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_interfaces == null || _interfaces.isEmpty)) {
+      offset_interfaces = fbBuilder.writeList(_interfaces.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_mixins == null || _mixins.isEmpty)) {
+      offset_mixins = fbBuilder.writeList(_mixins.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    if (_supertype != null) {
+      offset_supertype = _supertype.finish(fbBuilder);
+    }
+    if (!(_typeParameters == null || _typeParameters.isEmpty)) {
+      offset_typeParameters = fbBuilder.writeList(_typeParameters.map((b) => b.finish(fbBuilder)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_annotations != null) {
+      fbBuilder.addOffset(5, offset_annotations);
+    }
+    if (offset_codeRange != null) {
+      fbBuilder.addOffset(13, offset_codeRange);
+    }
+    if (offset_documentationComment != null) {
+      fbBuilder.addOffset(6, offset_documentationComment);
+    }
+    if (offset_executables != null) {
+      fbBuilder.addOffset(2, offset_executables);
+    }
+    if (offset_fields != null) {
+      fbBuilder.addOffset(4, offset_fields);
+    }
+    if (_hasNoSupertype == true) {
+      fbBuilder.addBool(12, true);
+    }
+    if (offset_interfaces != null) {
+      fbBuilder.addOffset(7, offset_interfaces);
+    }
+    if (_isAbstract == true) {
+      fbBuilder.addBool(8, true);
+    }
+    if (_isMixinApplication == true) {
+      fbBuilder.addBool(11, true);
+    }
+    if (offset_mixins != null) {
+      fbBuilder.addOffset(10, offset_mixins);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (_nameOffset != null && _nameOffset != 0) {
+      fbBuilder.addUint32(1, _nameOffset);
+    }
+    if (offset_supertype != null) {
+      fbBuilder.addOffset(3, offset_supertype);
+    }
+    if (offset_typeParameters != null) {
+      fbBuilder.addOffset(9, offset_typeParameters);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedClassReader extends fb.TableReader<_UnlinkedClassImpl> {
+  const _UnlinkedClassReader();
+
+  @override
+  _UnlinkedClassImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedClassImpl(bc, offset);
+}
+
+class _UnlinkedClassImpl extends Object with _UnlinkedClassMixin implements idl.UnlinkedClass {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedClassImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedConst> _annotations;
+  idl.CodeRange _codeRange;
+  idl.UnlinkedDocumentationComment _documentationComment;
+  List<idl.UnlinkedExecutable> _executables;
+  List<idl.UnlinkedVariable> _fields;
+  bool _hasNoSupertype;
+  List<idl.EntityRef> _interfaces;
+  bool _isAbstract;
+  bool _isMixinApplication;
+  List<idl.EntityRef> _mixins;
+  String _name;
+  int _nameOffset;
+  idl.EntityRef _supertype;
+  List<idl.UnlinkedTypeParam> _typeParameters;
+
+  @override
+  List<idl.UnlinkedConst> get annotations {
+    _annotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 5, const <idl.UnlinkedConst>[]);
+    return _annotations;
+  }
+
+  @override
+  idl.CodeRange get codeRange {
+    _codeRange ??= const _CodeRangeReader().vTableGet(_bc, _bcOffset, 13, null);
+    return _codeRange;
+  }
+
+  @override
+  idl.UnlinkedDocumentationComment get documentationComment {
+    _documentationComment ??= const _UnlinkedDocumentationCommentReader().vTableGet(_bc, _bcOffset, 6, null);
+    return _documentationComment;
+  }
+
+  @override
+  List<idl.UnlinkedExecutable> get executables {
+    _executables ??= const fb.ListReader<idl.UnlinkedExecutable>(const _UnlinkedExecutableReader()).vTableGet(_bc, _bcOffset, 2, const <idl.UnlinkedExecutable>[]);
+    return _executables;
+  }
+
+  @override
+  List<idl.UnlinkedVariable> get fields {
+    _fields ??= const fb.ListReader<idl.UnlinkedVariable>(const _UnlinkedVariableReader()).vTableGet(_bc, _bcOffset, 4, const <idl.UnlinkedVariable>[]);
+    return _fields;
+  }
+
+  @override
+  bool get hasNoSupertype {
+    _hasNoSupertype ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 12, false);
+    return _hasNoSupertype;
+  }
+
+  @override
+  List<idl.EntityRef> get interfaces {
+    _interfaces ??= const fb.ListReader<idl.EntityRef>(const _EntityRefReader()).vTableGet(_bc, _bcOffset, 7, const <idl.EntityRef>[]);
+    return _interfaces;
+  }
+
+  @override
+  bool get isAbstract {
+    _isAbstract ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 8, false);
+    return _isAbstract;
+  }
+
+  @override
+  bool get isMixinApplication {
+    _isMixinApplication ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 11, false);
+    return _isMixinApplication;
+  }
+
+  @override
+  List<idl.EntityRef> get mixins {
+    _mixins ??= const fb.ListReader<idl.EntityRef>(const _EntityRefReader()).vTableGet(_bc, _bcOffset, 10, const <idl.EntityRef>[]);
+    return _mixins;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  int get nameOffset {
+    _nameOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _nameOffset;
+  }
+
+  @override
+  idl.EntityRef get supertype {
+    _supertype ??= const _EntityRefReader().vTableGet(_bc, _bcOffset, 3, null);
+    return _supertype;
+  }
+
+  @override
+  List<idl.UnlinkedTypeParam> get typeParameters {
+    _typeParameters ??= const fb.ListReader<idl.UnlinkedTypeParam>(const _UnlinkedTypeParamReader()).vTableGet(_bc, _bcOffset, 9, const <idl.UnlinkedTypeParam>[]);
+    return _typeParameters;
+  }
+}
+
+abstract class _UnlinkedClassMixin implements idl.UnlinkedClass {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (annotations.isNotEmpty) _result["annotations"] = annotations.map((_value) => _value.toJson()).toList();
+    if (codeRange != null) _result["codeRange"] = codeRange.toJson();
+    if (documentationComment != null) _result["documentationComment"] = documentationComment.toJson();
+    if (executables.isNotEmpty) _result["executables"] = executables.map((_value) => _value.toJson()).toList();
+    if (fields.isNotEmpty) _result["fields"] = fields.map((_value) => _value.toJson()).toList();
+    if (hasNoSupertype != false) _result["hasNoSupertype"] = hasNoSupertype;
+    if (interfaces.isNotEmpty) _result["interfaces"] = interfaces.map((_value) => _value.toJson()).toList();
+    if (isAbstract != false) _result["isAbstract"] = isAbstract;
+    if (isMixinApplication != false) _result["isMixinApplication"] = isMixinApplication;
+    if (mixins.isNotEmpty) _result["mixins"] = mixins.map((_value) => _value.toJson()).toList();
+    if (name != '') _result["name"] = name;
+    if (nameOffset != 0) _result["nameOffset"] = nameOffset;
+    if (supertype != null) _result["supertype"] = supertype.toJson();
+    if (typeParameters.isNotEmpty) _result["typeParameters"] = typeParameters.map((_value) => _value.toJson()).toList();
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "annotations": annotations,
+    "codeRange": codeRange,
+    "documentationComment": documentationComment,
+    "executables": executables,
+    "fields": fields,
+    "hasNoSupertype": hasNoSupertype,
+    "interfaces": interfaces,
+    "isAbstract": isAbstract,
+    "isMixinApplication": isMixinApplication,
+    "mixins": mixins,
+    "name": name,
+    "nameOffset": nameOffset,
+    "supertype": supertype,
+    "typeParameters": typeParameters,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedCombinatorBuilder extends Object with _UnlinkedCombinatorMixin implements idl.UnlinkedCombinator {
+  int _end;
+  List<String> _hides;
+  int _offset;
+  List<String> _shows;
+
+  @override
+  int get end => _end ??= 0;
+
+  /**
+   * If this is a `show` combinator, offset of the end of the list of shown
+   * names.  Otherwise zero.
+   */
+  void set end(int value) {
+    assert(value == null || value >= 0);
+    this._end = value;
+  }
+
+  @override
+  List<String> get hides => _hides ??= <String>[];
+
+  /**
+   * List of names which are hidden.  Empty if this is a `show` combinator.
+   */
+  void set hides(List<String> value) {
+    this._hides = value;
+  }
+
+  @override
+  int get offset => _offset ??= 0;
+
+  /**
+   * If this is a `show` combinator, offset of the `show` keyword.  Otherwise
+   * zero.
+   */
+  void set offset(int value) {
+    assert(value == null || value >= 0);
+    this._offset = value;
+  }
+
+  @override
+  List<String> get shows => _shows ??= <String>[];
+
+  /**
+   * List of names which are shown.  Empty if this is a `hide` combinator.
+   */
+  void set shows(List<String> value) {
+    this._shows = value;
+  }
+
+  UnlinkedCombinatorBuilder({int end, List<String> hides, int offset, List<String> shows})
+    : _end = end,
+      _hides = hides,
+      _offset = offset,
+      _shows = shows;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _end = null;
+    _offset = null;
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    if (this._shows == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._shows.length);
+      for (var x in this._shows) {
+        signature.addString(x);
+      }
+    }
+    if (this._hides == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._hides.length);
+      for (var x in this._hides) {
+        signature.addString(x);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_hides;
+    fb.Offset offset_shows;
+    if (!(_hides == null || _hides.isEmpty)) {
+      offset_hides = fbBuilder.writeList(_hides.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    if (!(_shows == null || _shows.isEmpty)) {
+      offset_shows = fbBuilder.writeList(_shows.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    fbBuilder.startTable();
+    if (_end != null && _end != 0) {
+      fbBuilder.addUint32(3, _end);
+    }
+    if (offset_hides != null) {
+      fbBuilder.addOffset(1, offset_hides);
+    }
+    if (_offset != null && _offset != 0) {
+      fbBuilder.addUint32(2, _offset);
+    }
+    if (offset_shows != null) {
+      fbBuilder.addOffset(0, offset_shows);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedCombinatorReader extends fb.TableReader<_UnlinkedCombinatorImpl> {
+  const _UnlinkedCombinatorReader();
+
+  @override
+  _UnlinkedCombinatorImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedCombinatorImpl(bc, offset);
+}
+
+class _UnlinkedCombinatorImpl extends Object with _UnlinkedCombinatorMixin implements idl.UnlinkedCombinator {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedCombinatorImpl(this._bc, this._bcOffset);
+
+  int _end;
+  List<String> _hides;
+  int _offset;
+  List<String> _shows;
+
+  @override
+  int get end {
+    _end ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 3, 0);
+    return _end;
+  }
+
+  @override
+  List<String> get hides {
+    _hides ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 1, const <String>[]);
+    return _hides;
+  }
+
+  @override
+  int get offset {
+    _offset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 2, 0);
+    return _offset;
+  }
+
+  @override
+  List<String> get shows {
+    _shows ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 0, const <String>[]);
+    return _shows;
+  }
+}
+
+abstract class _UnlinkedCombinatorMixin implements idl.UnlinkedCombinator {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (end != 0) _result["end"] = end;
+    if (hides.isNotEmpty) _result["hides"] = hides;
+    if (offset != 0) _result["offset"] = offset;
+    if (shows.isNotEmpty) _result["shows"] = shows;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "end": end,
+    "hides": hides,
+    "offset": offset,
+    "shows": shows,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedConfigurationBuilder extends Object with _UnlinkedConfigurationMixin implements idl.UnlinkedConfiguration {
+  String _name;
+  String _uri;
+  String _value;
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * The name of the declared variable whose value is being used in the
+   * condition.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  String get uri => _uri ??= '';
+
+  /**
+   * The URI of the implementation library to be used if the condition is true.
+   */
+  void set uri(String value) {
+    this._uri = value;
+  }
+
+  @override
+  String get value => _value ??= '';
+
+  /**
+   * The value to which the value of the declared variable will be compared,
+   * or `true` if the condition does not include an equality test.
+   */
+  void set value(String value) {
+    this._value = value;
+  }
+
+  UnlinkedConfigurationBuilder({String name, String uri, String value})
+    : _name = name,
+      _uri = uri,
+      _value = value;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    signature.addString(this._value ?? '');
+    signature.addString(this._uri ?? '');
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_name;
+    fb.Offset offset_uri;
+    fb.Offset offset_value;
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    if (_uri != null) {
+      offset_uri = fbBuilder.writeString(_uri);
+    }
+    if (_value != null) {
+      offset_value = fbBuilder.writeString(_value);
+    }
+    fbBuilder.startTable();
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (offset_uri != null) {
+      fbBuilder.addOffset(2, offset_uri);
+    }
+    if (offset_value != null) {
+      fbBuilder.addOffset(1, offset_value);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedConfigurationReader extends fb.TableReader<_UnlinkedConfigurationImpl> {
+  const _UnlinkedConfigurationReader();
+
+  @override
+  _UnlinkedConfigurationImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedConfigurationImpl(bc, offset);
+}
+
+class _UnlinkedConfigurationImpl extends Object with _UnlinkedConfigurationMixin implements idl.UnlinkedConfiguration {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedConfigurationImpl(this._bc, this._bcOffset);
+
+  String _name;
+  String _uri;
+  String _value;
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  String get uri {
+    _uri ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 2, '');
+    return _uri;
+  }
+
+  @override
+  String get value {
+    _value ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 1, '');
+    return _value;
+  }
+}
+
+abstract class _UnlinkedConfigurationMixin implements idl.UnlinkedConfiguration {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (name != '') _result["name"] = name;
+    if (uri != '') _result["uri"] = uri;
+    if (value != '') _result["value"] = value;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "name": name,
+    "uri": uri,
+    "value": value,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedConstBuilder extends Object with _UnlinkedConstMixin implements idl.UnlinkedConst {
+  List<idl.UnlinkedExprAssignOperator> _assignmentOperators;
+  List<double> _doubles;
+  List<int> _ints;
+  bool _isValidConst;
+  List<idl.UnlinkedConstOperation> _operations;
+  List<EntityRefBuilder> _references;
+  List<String> _strings;
+
+  @override
+  List<idl.UnlinkedExprAssignOperator> get assignmentOperators => _assignmentOperators ??= <idl.UnlinkedExprAssignOperator>[];
+
+  /**
+   * Sequence of operators used by assignment operations.
+   */
+  void set assignmentOperators(List<idl.UnlinkedExprAssignOperator> value) {
+    this._assignmentOperators = value;
+  }
+
+  @override
+  List<double> get doubles => _doubles ??= <double>[];
+
+  /**
+   * Sequence of 64-bit doubles consumed by the operation `pushDouble`.
+   */
+  void set doubles(List<double> value) {
+    this._doubles = value;
+  }
+
+  @override
+  List<int> get ints => _ints ??= <int>[];
+
+  /**
+   * Sequence of unsigned 32-bit integers consumed by the operations
+   * `pushArgument`, `pushInt`, `shiftOr`, `concatenate`, `invokeConstructor`,
+   * `makeList`, and `makeMap`.
+   */
+  void set ints(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._ints = value;
+  }
+
+  @override
+  bool get isValidConst => _isValidConst ??= false;
+
+  /**
+   * Indicates whether the expression is a valid potentially constant
+   * expression.
+   */
+  void set isValidConst(bool value) {
+    this._isValidConst = value;
+  }
+
+  @override
+  List<idl.UnlinkedConstOperation> get operations => _operations ??= <idl.UnlinkedConstOperation>[];
+
+  /**
+   * Sequence of operations to execute (starting with an empty stack) to form
+   * the constant value.
+   */
+  void set operations(List<idl.UnlinkedConstOperation> value) {
+    this._operations = value;
+  }
+
+  @override
+  List<EntityRefBuilder> get references => _references ??= <EntityRefBuilder>[];
+
+  /**
+   * Sequence of language constructs consumed by the operations
+   * `pushReference`, `invokeConstructor`, `makeList`, and `makeMap`.  Note
+   * that in the case of `pushReference` (and sometimes `invokeConstructor` the
+   * actual entity being referred to may be something other than a type.
+   */
+  void set references(List<EntityRefBuilder> value) {
+    this._references = value;
+  }
+
+  @override
+  List<String> get strings => _strings ??= <String>[];
+
+  /**
+   * Sequence of strings consumed by the operations `pushString` and
+   * `invokeConstructor`.
+   */
+  void set strings(List<String> value) {
+    this._strings = value;
+  }
+
+  UnlinkedConstBuilder({List<idl.UnlinkedExprAssignOperator> assignmentOperators, List<double> doubles, List<int> ints, bool isValidConst, List<idl.UnlinkedConstOperation> operations, List<EntityRefBuilder> references, List<String> strings})
+    : _assignmentOperators = assignmentOperators,
+      _doubles = doubles,
+      _ints = ints,
+      _isValidConst = isValidConst,
+      _operations = operations,
+      _references = references,
+      _strings = strings;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _references?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    if (this._operations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._operations.length);
+      for (var x in this._operations) {
+        signature.addInt(x.index);
+      }
+    }
+    if (this._ints == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._ints.length);
+      for (var x in this._ints) {
+        signature.addInt(x);
+      }
+    }
+    if (this._references == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._references.length);
+      for (var x in this._references) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._strings == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._strings.length);
+      for (var x in this._strings) {
+        signature.addString(x);
+      }
+    }
+    if (this._doubles == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._doubles.length);
+      for (var x in this._doubles) {
+        signature.addDouble(x);
+      }
+    }
+    signature.addBool(this._isValidConst == true);
+    if (this._assignmentOperators == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._assignmentOperators.length);
+      for (var x in this._assignmentOperators) {
+        signature.addInt(x.index);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_assignmentOperators;
+    fb.Offset offset_doubles;
+    fb.Offset offset_ints;
+    fb.Offset offset_operations;
+    fb.Offset offset_references;
+    fb.Offset offset_strings;
+    if (!(_assignmentOperators == null || _assignmentOperators.isEmpty)) {
+      offset_assignmentOperators = fbBuilder.writeListUint8(_assignmentOperators.map((b) => b.index).toList());
+    }
+    if (!(_doubles == null || _doubles.isEmpty)) {
+      offset_doubles = fbBuilder.writeListFloat64(_doubles);
+    }
+    if (!(_ints == null || _ints.isEmpty)) {
+      offset_ints = fbBuilder.writeListUint32(_ints);
+    }
+    if (!(_operations == null || _operations.isEmpty)) {
+      offset_operations = fbBuilder.writeListUint8(_operations.map((b) => b.index).toList());
+    }
+    if (!(_references == null || _references.isEmpty)) {
+      offset_references = fbBuilder.writeList(_references.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_strings == null || _strings.isEmpty)) {
+      offset_strings = fbBuilder.writeList(_strings.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_assignmentOperators != null) {
+      fbBuilder.addOffset(6, offset_assignmentOperators);
+    }
+    if (offset_doubles != null) {
+      fbBuilder.addOffset(4, offset_doubles);
+    }
+    if (offset_ints != null) {
+      fbBuilder.addOffset(1, offset_ints);
+    }
+    if (_isValidConst == true) {
+      fbBuilder.addBool(5, true);
+    }
+    if (offset_operations != null) {
+      fbBuilder.addOffset(0, offset_operations);
+    }
+    if (offset_references != null) {
+      fbBuilder.addOffset(2, offset_references);
+    }
+    if (offset_strings != null) {
+      fbBuilder.addOffset(3, offset_strings);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedConstReader extends fb.TableReader<_UnlinkedConstImpl> {
+  const _UnlinkedConstReader();
+
+  @override
+  _UnlinkedConstImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedConstImpl(bc, offset);
+}
+
+class _UnlinkedConstImpl extends Object with _UnlinkedConstMixin implements idl.UnlinkedConst {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedConstImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedExprAssignOperator> _assignmentOperators;
+  List<double> _doubles;
+  List<int> _ints;
+  bool _isValidConst;
+  List<idl.UnlinkedConstOperation> _operations;
+  List<idl.EntityRef> _references;
+  List<String> _strings;
+
+  @override
+  List<idl.UnlinkedExprAssignOperator> get assignmentOperators {
+    _assignmentOperators ??= const fb.ListReader<idl.UnlinkedExprAssignOperator>(const _UnlinkedExprAssignOperatorReader()).vTableGet(_bc, _bcOffset, 6, const <idl.UnlinkedExprAssignOperator>[]);
+    return _assignmentOperators;
+  }
+
+  @override
+  List<double> get doubles {
+    _doubles ??= const fb.Float64ListReader().vTableGet(_bc, _bcOffset, 4, const <double>[]);
+    return _doubles;
+  }
+
+  @override
+  List<int> get ints {
+    _ints ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 1, const <int>[]);
+    return _ints;
+  }
+
+  @override
+  bool get isValidConst {
+    _isValidConst ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 5, false);
+    return _isValidConst;
+  }
+
+  @override
+  List<idl.UnlinkedConstOperation> get operations {
+    _operations ??= const fb.ListReader<idl.UnlinkedConstOperation>(const _UnlinkedConstOperationReader()).vTableGet(_bc, _bcOffset, 0, const <idl.UnlinkedConstOperation>[]);
+    return _operations;
+  }
+
+  @override
+  List<idl.EntityRef> get references {
+    _references ??= const fb.ListReader<idl.EntityRef>(const _EntityRefReader()).vTableGet(_bc, _bcOffset, 2, const <idl.EntityRef>[]);
+    return _references;
+  }
+
+  @override
+  List<String> get strings {
+    _strings ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 3, const <String>[]);
+    return _strings;
+  }
+}
+
+abstract class _UnlinkedConstMixin implements idl.UnlinkedConst {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (assignmentOperators.isNotEmpty) _result["assignmentOperators"] = assignmentOperators.map((_value) => _value.toString().split('.')[1]).toList();
+    if (doubles.isNotEmpty) _result["doubles"] = doubles.map((_value) => _value.isFinite ? _value : _value.toString()).toList();
+    if (ints.isNotEmpty) _result["ints"] = ints;
+    if (isValidConst != false) _result["isValidConst"] = isValidConst;
+    if (operations.isNotEmpty) _result["operations"] = operations.map((_value) => _value.toString().split('.')[1]).toList();
+    if (references.isNotEmpty) _result["references"] = references.map((_value) => _value.toJson()).toList();
+    if (strings.isNotEmpty) _result["strings"] = strings;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "assignmentOperators": assignmentOperators,
+    "doubles": doubles,
+    "ints": ints,
+    "isValidConst": isValidConst,
+    "operations": operations,
+    "references": references,
+    "strings": strings,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedConstructorInitializerBuilder extends Object with _UnlinkedConstructorInitializerMixin implements idl.UnlinkedConstructorInitializer {
+  List<String> _argumentNames;
+  List<UnlinkedConstBuilder> _arguments;
+  UnlinkedConstBuilder _expression;
+  idl.UnlinkedConstructorInitializerKind _kind;
+  String _name;
+
+  @override
+  List<String> get argumentNames => _argumentNames ??= <String>[];
+
+  /**
+   * If there are `m` [arguments] and `n` [argumentNames], then each argument
+   * from [arguments] with index `i` such that `n + i - m >= 0`, should be used
+   * with the name at `n + i - m`.
+   */
+  void set argumentNames(List<String> value) {
+    this._argumentNames = value;
+  }
+
+  @override
+  List<UnlinkedConstBuilder> get arguments => _arguments ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * If [kind] is `thisInvocation` or `superInvocation`, the arguments of the
+   * invocation.  Otherwise empty.
+   */
+  void set arguments(List<UnlinkedConstBuilder> value) {
+    this._arguments = value;
+  }
+
+  @override
+  UnlinkedConstBuilder get expression => _expression;
+
+  /**
+   * If [kind] is `field`, the expression of the field initializer.
+   * Otherwise `null`.
+   */
+  void set expression(UnlinkedConstBuilder value) {
+    this._expression = value;
+  }
+
+  @override
+  idl.UnlinkedConstructorInitializerKind get kind => _kind ??= idl.UnlinkedConstructorInitializerKind.field;
+
+  /**
+   * The kind of the constructor initializer (field, redirect, super).
+   */
+  void set kind(idl.UnlinkedConstructorInitializerKind value) {
+    this._kind = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * If [kind] is `field`, the name of the field declared in the class.  If
+   * [kind] is `thisInvocation`, the name of the constructor, declared in this
+   * class, to redirect to.  If [kind] is `superInvocation`, the name of the
+   * constructor, declared in the superclass, to invoke.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  UnlinkedConstructorInitializerBuilder({List<String> argumentNames, List<UnlinkedConstBuilder> arguments, UnlinkedConstBuilder expression, idl.UnlinkedConstructorInitializerKind kind, String name})
+    : _argumentNames = argumentNames,
+      _arguments = arguments,
+      _expression = expression,
+      _kind = kind,
+      _name = name;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _arguments?.forEach((b) => b.flushInformative());
+    _expression?.flushInformative();
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    signature.addBool(this._expression != null);
+    this._expression?.collectApiSignature(signature);
+    signature.addInt(this._kind == null ? 0 : this._kind.index);
+    if (this._arguments == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._arguments.length);
+      for (var x in this._arguments) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._argumentNames == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._argumentNames.length);
+      for (var x in this._argumentNames) {
+        signature.addString(x);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_argumentNames;
+    fb.Offset offset_arguments;
+    fb.Offset offset_expression;
+    fb.Offset offset_name;
+    if (!(_argumentNames == null || _argumentNames.isEmpty)) {
+      offset_argumentNames = fbBuilder.writeList(_argumentNames.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    if (!(_arguments == null || _arguments.isEmpty)) {
+      offset_arguments = fbBuilder.writeList(_arguments.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_expression != null) {
+      offset_expression = _expression.finish(fbBuilder);
+    }
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    fbBuilder.startTable();
+    if (offset_argumentNames != null) {
+      fbBuilder.addOffset(4, offset_argumentNames);
+    }
+    if (offset_arguments != null) {
+      fbBuilder.addOffset(3, offset_arguments);
+    }
+    if (offset_expression != null) {
+      fbBuilder.addOffset(1, offset_expression);
+    }
+    if (_kind != null && _kind != idl.UnlinkedConstructorInitializerKind.field) {
+      fbBuilder.addUint8(2, _kind.index);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedConstructorInitializerReader extends fb.TableReader<_UnlinkedConstructorInitializerImpl> {
+  const _UnlinkedConstructorInitializerReader();
+
+  @override
+  _UnlinkedConstructorInitializerImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedConstructorInitializerImpl(bc, offset);
+}
+
+class _UnlinkedConstructorInitializerImpl extends Object with _UnlinkedConstructorInitializerMixin implements idl.UnlinkedConstructorInitializer {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedConstructorInitializerImpl(this._bc, this._bcOffset);
+
+  List<String> _argumentNames;
+  List<idl.UnlinkedConst> _arguments;
+  idl.UnlinkedConst _expression;
+  idl.UnlinkedConstructorInitializerKind _kind;
+  String _name;
+
+  @override
+  List<String> get argumentNames {
+    _argumentNames ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 4, const <String>[]);
+    return _argumentNames;
+  }
+
+  @override
+  List<idl.UnlinkedConst> get arguments {
+    _arguments ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 3, const <idl.UnlinkedConst>[]);
+    return _arguments;
+  }
+
+  @override
+  idl.UnlinkedConst get expression {
+    _expression ??= const _UnlinkedConstReader().vTableGet(_bc, _bcOffset, 1, null);
+    return _expression;
+  }
+
+  @override
+  idl.UnlinkedConstructorInitializerKind get kind {
+    _kind ??= const _UnlinkedConstructorInitializerKindReader().vTableGet(_bc, _bcOffset, 2, idl.UnlinkedConstructorInitializerKind.field);
+    return _kind;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+}
+
+abstract class _UnlinkedConstructorInitializerMixin implements idl.UnlinkedConstructorInitializer {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (argumentNames.isNotEmpty) _result["argumentNames"] = argumentNames;
+    if (arguments.isNotEmpty) _result["arguments"] = arguments.map((_value) => _value.toJson()).toList();
+    if (expression != null) _result["expression"] = expression.toJson();
+    if (kind != idl.UnlinkedConstructorInitializerKind.field) _result["kind"] = kind.toString().split('.')[1];
+    if (name != '') _result["name"] = name;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "argumentNames": argumentNames,
+    "arguments": arguments,
+    "expression": expression,
+    "kind": kind,
+    "name": name,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedDocumentationCommentBuilder extends Object with _UnlinkedDocumentationCommentMixin implements idl.UnlinkedDocumentationComment {
+  String _text;
+
+  @override
+  int get length => throw new UnimplementedError('attempt to access deprecated field');
+
+  @override
+  int get offset => throw new UnimplementedError('attempt to access deprecated field');
+
+  @override
+  String get text => _text ??= '';
+
+  /**
+   * Text of the documentation comment, with '\r\n' replaced by '\n'.
+   *
+   * References appearing within the doc comment in square brackets are not
+   * specially encoded.
+   */
+  void set text(String value) {
+    this._text = value;
+  }
+
+  UnlinkedDocumentationCommentBuilder({String text})
+    : _text = text;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._text ?? '');
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_text;
+    if (_text != null) {
+      offset_text = fbBuilder.writeString(_text);
+    }
+    fbBuilder.startTable();
+    if (offset_text != null) {
+      fbBuilder.addOffset(1, offset_text);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedDocumentationCommentReader extends fb.TableReader<_UnlinkedDocumentationCommentImpl> {
+  const _UnlinkedDocumentationCommentReader();
+
+  @override
+  _UnlinkedDocumentationCommentImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedDocumentationCommentImpl(bc, offset);
+}
+
+class _UnlinkedDocumentationCommentImpl extends Object with _UnlinkedDocumentationCommentMixin implements idl.UnlinkedDocumentationComment {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedDocumentationCommentImpl(this._bc, this._bcOffset);
+
+  String _text;
+
+  @override
+  int get length => throw new UnimplementedError('attempt to access deprecated field');
+
+  @override
+  int get offset => throw new UnimplementedError('attempt to access deprecated field');
+
+  @override
+  String get text {
+    _text ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 1, '');
+    return _text;
+  }
+}
+
+abstract class _UnlinkedDocumentationCommentMixin implements idl.UnlinkedDocumentationComment {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (text != '') _result["text"] = text;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "text": text,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedEnumBuilder extends Object with _UnlinkedEnumMixin implements idl.UnlinkedEnum {
+  List<UnlinkedConstBuilder> _annotations;
+  CodeRangeBuilder _codeRange;
+  UnlinkedDocumentationCommentBuilder _documentationComment;
+  String _name;
+  int _nameOffset;
+  List<UnlinkedEnumValueBuilder> _values;
+
+  @override
+  List<UnlinkedConstBuilder> get annotations => _annotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for this enum.
+   */
+  void set annotations(List<UnlinkedConstBuilder> value) {
+    this._annotations = value;
+  }
+
+  @override
+  CodeRangeBuilder get codeRange => _codeRange;
+
+  /**
+   * Code range of the enum.
+   */
+  void set codeRange(CodeRangeBuilder value) {
+    this._codeRange = value;
+  }
+
+  @override
+  UnlinkedDocumentationCommentBuilder get documentationComment => _documentationComment;
+
+  /**
+   * Documentation comment for the enum, or `null` if there is no documentation
+   * comment.
+   */
+  void set documentationComment(UnlinkedDocumentationCommentBuilder value) {
+    this._documentationComment = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the enum type.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get nameOffset => _nameOffset ??= 0;
+
+  /**
+   * Offset of the enum name relative to the beginning of the file.
+   */
+  void set nameOffset(int value) {
+    assert(value == null || value >= 0);
+    this._nameOffset = value;
+  }
+
+  @override
+  List<UnlinkedEnumValueBuilder> get values => _values ??= <UnlinkedEnumValueBuilder>[];
+
+  /**
+   * Values listed in the enum declaration, in declaration order.
+   */
+  void set values(List<UnlinkedEnumValueBuilder> value) {
+    this._values = value;
+  }
+
+  UnlinkedEnumBuilder({List<UnlinkedConstBuilder> annotations, CodeRangeBuilder codeRange, UnlinkedDocumentationCommentBuilder documentationComment, String name, int nameOffset, List<UnlinkedEnumValueBuilder> values})
+    : _annotations = annotations,
+      _codeRange = codeRange,
+      _documentationComment = documentationComment,
+      _name = name,
+      _nameOffset = nameOffset,
+      _values = values;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _annotations?.forEach((b) => b.flushInformative());
+    _codeRange = null;
+    _documentationComment = null;
+    _nameOffset = null;
+    _values?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    if (this._values == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._values.length);
+      for (var x in this._values) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._annotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._annotations.length);
+      for (var x in this._annotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_annotations;
+    fb.Offset offset_codeRange;
+    fb.Offset offset_documentationComment;
+    fb.Offset offset_name;
+    fb.Offset offset_values;
+    if (!(_annotations == null || _annotations.isEmpty)) {
+      offset_annotations = fbBuilder.writeList(_annotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_codeRange != null) {
+      offset_codeRange = _codeRange.finish(fbBuilder);
+    }
+    if (_documentationComment != null) {
+      offset_documentationComment = _documentationComment.finish(fbBuilder);
+    }
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    if (!(_values == null || _values.isEmpty)) {
+      offset_values = fbBuilder.writeList(_values.map((b) => b.finish(fbBuilder)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_annotations != null) {
+      fbBuilder.addOffset(4, offset_annotations);
+    }
+    if (offset_codeRange != null) {
+      fbBuilder.addOffset(5, offset_codeRange);
+    }
+    if (offset_documentationComment != null) {
+      fbBuilder.addOffset(3, offset_documentationComment);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (_nameOffset != null && _nameOffset != 0) {
+      fbBuilder.addUint32(1, _nameOffset);
+    }
+    if (offset_values != null) {
+      fbBuilder.addOffset(2, offset_values);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedEnumReader extends fb.TableReader<_UnlinkedEnumImpl> {
+  const _UnlinkedEnumReader();
+
+  @override
+  _UnlinkedEnumImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedEnumImpl(bc, offset);
+}
+
+class _UnlinkedEnumImpl extends Object with _UnlinkedEnumMixin implements idl.UnlinkedEnum {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedEnumImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedConst> _annotations;
+  idl.CodeRange _codeRange;
+  idl.UnlinkedDocumentationComment _documentationComment;
+  String _name;
+  int _nameOffset;
+  List<idl.UnlinkedEnumValue> _values;
+
+  @override
+  List<idl.UnlinkedConst> get annotations {
+    _annotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 4, const <idl.UnlinkedConst>[]);
+    return _annotations;
+  }
+
+  @override
+  idl.CodeRange get codeRange {
+    _codeRange ??= const _CodeRangeReader().vTableGet(_bc, _bcOffset, 5, null);
+    return _codeRange;
+  }
+
+  @override
+  idl.UnlinkedDocumentationComment get documentationComment {
+    _documentationComment ??= const _UnlinkedDocumentationCommentReader().vTableGet(_bc, _bcOffset, 3, null);
+    return _documentationComment;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  int get nameOffset {
+    _nameOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _nameOffset;
+  }
+
+  @override
+  List<idl.UnlinkedEnumValue> get values {
+    _values ??= const fb.ListReader<idl.UnlinkedEnumValue>(const _UnlinkedEnumValueReader()).vTableGet(_bc, _bcOffset, 2, const <idl.UnlinkedEnumValue>[]);
+    return _values;
+  }
+}
+
+abstract class _UnlinkedEnumMixin implements idl.UnlinkedEnum {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (annotations.isNotEmpty) _result["annotations"] = annotations.map((_value) => _value.toJson()).toList();
+    if (codeRange != null) _result["codeRange"] = codeRange.toJson();
+    if (documentationComment != null) _result["documentationComment"] = documentationComment.toJson();
+    if (name != '') _result["name"] = name;
+    if (nameOffset != 0) _result["nameOffset"] = nameOffset;
+    if (values.isNotEmpty) _result["values"] = values.map((_value) => _value.toJson()).toList();
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "annotations": annotations,
+    "codeRange": codeRange,
+    "documentationComment": documentationComment,
+    "name": name,
+    "nameOffset": nameOffset,
+    "values": values,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedEnumValueBuilder extends Object with _UnlinkedEnumValueMixin implements idl.UnlinkedEnumValue {
+  UnlinkedDocumentationCommentBuilder _documentationComment;
+  String _name;
+  int _nameOffset;
+
+  @override
+  UnlinkedDocumentationCommentBuilder get documentationComment => _documentationComment;
+
+  /**
+   * Documentation comment for the enum value, or `null` if there is no
+   * documentation comment.
+   */
+  void set documentationComment(UnlinkedDocumentationCommentBuilder value) {
+    this._documentationComment = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the enumerated value.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get nameOffset => _nameOffset ??= 0;
+
+  /**
+   * Offset of the enum value name relative to the beginning of the file.
+   */
+  void set nameOffset(int value) {
+    assert(value == null || value >= 0);
+    this._nameOffset = value;
+  }
+
+  UnlinkedEnumValueBuilder({UnlinkedDocumentationCommentBuilder documentationComment, String name, int nameOffset})
+    : _documentationComment = documentationComment,
+      _name = name,
+      _nameOffset = nameOffset;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _documentationComment = null;
+    _nameOffset = null;
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_documentationComment;
+    fb.Offset offset_name;
+    if (_documentationComment != null) {
+      offset_documentationComment = _documentationComment.finish(fbBuilder);
+    }
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    fbBuilder.startTable();
+    if (offset_documentationComment != null) {
+      fbBuilder.addOffset(2, offset_documentationComment);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (_nameOffset != null && _nameOffset != 0) {
+      fbBuilder.addUint32(1, _nameOffset);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedEnumValueReader extends fb.TableReader<_UnlinkedEnumValueImpl> {
+  const _UnlinkedEnumValueReader();
+
+  @override
+  _UnlinkedEnumValueImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedEnumValueImpl(bc, offset);
+}
+
+class _UnlinkedEnumValueImpl extends Object with _UnlinkedEnumValueMixin implements idl.UnlinkedEnumValue {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedEnumValueImpl(this._bc, this._bcOffset);
+
+  idl.UnlinkedDocumentationComment _documentationComment;
+  String _name;
+  int _nameOffset;
+
+  @override
+  idl.UnlinkedDocumentationComment get documentationComment {
+    _documentationComment ??= const _UnlinkedDocumentationCommentReader().vTableGet(_bc, _bcOffset, 2, null);
+    return _documentationComment;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  int get nameOffset {
+    _nameOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _nameOffset;
+  }
+}
+
+abstract class _UnlinkedEnumValueMixin implements idl.UnlinkedEnumValue {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (documentationComment != null) _result["documentationComment"] = documentationComment.toJson();
+    if (name != '') _result["name"] = name;
+    if (nameOffset != 0) _result["nameOffset"] = nameOffset;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "documentationComment": documentationComment,
+    "name": name,
+    "nameOffset": nameOffset,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedExecutableBuilder extends Object with _UnlinkedExecutableMixin implements idl.UnlinkedExecutable {
+  List<UnlinkedConstBuilder> _annotations;
+  UnlinkedConstBuilder _bodyExpr;
+  CodeRangeBuilder _codeRange;
+  List<UnlinkedConstructorInitializerBuilder> _constantInitializers;
+  int _constCycleSlot;
+  UnlinkedDocumentationCommentBuilder _documentationComment;
+  int _inferredReturnTypeSlot;
+  bool _isAbstract;
+  bool _isAsynchronous;
+  bool _isConst;
+  bool _isExternal;
+  bool _isFactory;
+  bool _isGenerator;
+  bool _isRedirectedConstructor;
+  bool _isStatic;
+  idl.UnlinkedExecutableKind _kind;
+  List<UnlinkedExecutableBuilder> _localFunctions;
+  List<UnlinkedLabelBuilder> _localLabels;
+  List<UnlinkedVariableBuilder> _localVariables;
+  String _name;
+  int _nameEnd;
+  int _nameOffset;
+  List<UnlinkedParamBuilder> _parameters;
+  int _periodOffset;
+  EntityRefBuilder _redirectedConstructor;
+  String _redirectedConstructorName;
+  EntityRefBuilder _returnType;
+  List<UnlinkedTypeParamBuilder> _typeParameters;
+  int _visibleLength;
+  int _visibleOffset;
+
+  @override
+  List<UnlinkedConstBuilder> get annotations => _annotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for this executable.
+   */
+  void set annotations(List<UnlinkedConstBuilder> value) {
+    this._annotations = value;
+  }
+
+  @override
+  UnlinkedConstBuilder get bodyExpr => _bodyExpr;
+
+  /**
+   * If this executable's function body is declared using `=>`, the expression
+   * to the right of the `=>`.  May be omitted if neither type inference nor
+   * constant evaluation depends on the function body.
+   */
+  void set bodyExpr(UnlinkedConstBuilder value) {
+    this._bodyExpr = value;
+  }
+
+  @override
+  CodeRangeBuilder get codeRange => _codeRange;
+
+  /**
+   * Code range of the executable.
+   */
+  void set codeRange(CodeRangeBuilder value) {
+    this._codeRange = value;
+  }
+
+  @override
+  List<UnlinkedConstructorInitializerBuilder> get constantInitializers => _constantInitializers ??= <UnlinkedConstructorInitializerBuilder>[];
+
+  /**
+   * If a constant [UnlinkedExecutableKind.constructor], the constructor
+   * initializers.  Otherwise empty.
+   */
+  void set constantInitializers(List<UnlinkedConstructorInitializerBuilder> value) {
+    this._constantInitializers = value;
+  }
+
+  @override
+  int get constCycleSlot => _constCycleSlot ??= 0;
+
+  /**
+   * If [kind] is [UnlinkedExecutableKind.constructor] and [isConst] is `true`,
+   * a nonzero slot id which is unique within this compilation unit.  If this id
+   * is found in [LinkedUnit.constCycles], then this constructor is part of a
+   * cycle.
+   *
+   * Otherwise, zero.
+   */
+  void set constCycleSlot(int value) {
+    assert(value == null || value >= 0);
+    this._constCycleSlot = value;
+  }
+
+  @override
+  UnlinkedDocumentationCommentBuilder get documentationComment => _documentationComment;
+
+  /**
+   * Documentation comment for the executable, or `null` if there is no
+   * documentation comment.
+   */
+  void set documentationComment(UnlinkedDocumentationCommentBuilder value) {
+    this._documentationComment = value;
+  }
+
+  @override
+  int get inferredReturnTypeSlot => _inferredReturnTypeSlot ??= 0;
+
+  /**
+   * If this executable's return type is inferable, nonzero slot id
+   * identifying which entry in [LinkedUnit.types] contains the inferred
+   * return type.  If there is no matching entry in [LinkedUnit.types], then
+   * no return type was inferred for this variable, so its static type is
+   * `dynamic`.
+   */
+  void set inferredReturnTypeSlot(int value) {
+    assert(value == null || value >= 0);
+    this._inferredReturnTypeSlot = value;
+  }
+
+  @override
+  bool get isAbstract => _isAbstract ??= false;
+
+  /**
+   * Indicates whether the executable is declared using the `abstract` keyword.
+   */
+  void set isAbstract(bool value) {
+    this._isAbstract = value;
+  }
+
+  @override
+  bool get isAsynchronous => _isAsynchronous ??= false;
+
+  /**
+   * Indicates whether the executable has body marked as being asynchronous.
+   */
+  void set isAsynchronous(bool value) {
+    this._isAsynchronous = value;
+  }
+
+  @override
+  bool get isConst => _isConst ??= false;
+
+  /**
+   * Indicates whether the executable is declared using the `const` keyword.
+   */
+  void set isConst(bool value) {
+    this._isConst = value;
+  }
+
+  @override
+  bool get isExternal => _isExternal ??= false;
+
+  /**
+   * Indicates whether the executable is declared using the `external` keyword.
+   */
+  void set isExternal(bool value) {
+    this._isExternal = value;
+  }
+
+  @override
+  bool get isFactory => _isFactory ??= false;
+
+  /**
+   * Indicates whether the executable is declared using the `factory` keyword.
+   */
+  void set isFactory(bool value) {
+    this._isFactory = value;
+  }
+
+  @override
+  bool get isGenerator => _isGenerator ??= false;
+
+  /**
+   * Indicates whether the executable has body marked as being a generator.
+   */
+  void set isGenerator(bool value) {
+    this._isGenerator = value;
+  }
+
+  @override
+  bool get isRedirectedConstructor => _isRedirectedConstructor ??= false;
+
+  /**
+   * Indicates whether the executable is a redirected constructor.
+   */
+  void set isRedirectedConstructor(bool value) {
+    this._isRedirectedConstructor = value;
+  }
+
+  @override
+  bool get isStatic => _isStatic ??= false;
+
+  /**
+   * Indicates whether the executable is declared using the `static` keyword.
+   *
+   * Note that for top level executables, this flag is false, since they are
+   * not declared using the `static` keyword (even though they are considered
+   * static for semantic purposes).
+   */
+  void set isStatic(bool value) {
+    this._isStatic = value;
+  }
+
+  @override
+  idl.UnlinkedExecutableKind get kind => _kind ??= idl.UnlinkedExecutableKind.functionOrMethod;
+
+  /**
+   * The kind of the executable (function/method, getter, setter, or
+   * constructor).
+   */
+  void set kind(idl.UnlinkedExecutableKind value) {
+    this._kind = value;
+  }
+
+  @override
+  List<UnlinkedExecutableBuilder> get localFunctions => _localFunctions ??= <UnlinkedExecutableBuilder>[];
+
+  /**
+   * The list of local functions.
+   */
+  void set localFunctions(List<UnlinkedExecutableBuilder> value) {
+    this._localFunctions = value;
+  }
+
+  @override
+  List<UnlinkedLabelBuilder> get localLabels => _localLabels ??= <UnlinkedLabelBuilder>[];
+
+  /**
+   * The list of local labels.
+   */
+  void set localLabels(List<UnlinkedLabelBuilder> value) {
+    this._localLabels = value;
+  }
+
+  @override
+  List<UnlinkedVariableBuilder> get localVariables => _localVariables ??= <UnlinkedVariableBuilder>[];
+
+  /**
+   * The list of local variables.
+   */
+  void set localVariables(List<UnlinkedVariableBuilder> value) {
+    this._localVariables = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the executable.  For setters, this includes the trailing "=".  For
+   * named constructors, this excludes the class name and excludes the ".".
+   * For unnamed constructors, this is the empty string.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get nameEnd => _nameEnd ??= 0;
+
+  /**
+   * If [kind] is [UnlinkedExecutableKind.constructor] and [name] is not empty,
+   * the offset of the end of the constructor name.  Otherwise zero.
+   */
+  void set nameEnd(int value) {
+    assert(value == null || value >= 0);
+    this._nameEnd = value;
+  }
+
+  @override
+  int get nameOffset => _nameOffset ??= 0;
+
+  /**
+   * Offset of the executable name relative to the beginning of the file.  For
+   * named constructors, this excludes the class name and excludes the ".".
+   * For unnamed constructors, this is the offset of the class name (i.e. the
+   * offset of the second "C" in "class C { C(); }").
+   */
+  void set nameOffset(int value) {
+    assert(value == null || value >= 0);
+    this._nameOffset = value;
+  }
+
+  @override
+  List<UnlinkedParamBuilder> get parameters => _parameters ??= <UnlinkedParamBuilder>[];
+
+  /**
+   * Parameters of the executable, if any.  Note that getters have no
+   * parameters (hence this will be the empty list), and setters have a single
+   * parameter.
+   */
+  void set parameters(List<UnlinkedParamBuilder> value) {
+    this._parameters = value;
+  }
+
+  @override
+  int get periodOffset => _periodOffset ??= 0;
+
+  /**
+   * If [kind] is [UnlinkedExecutableKind.constructor] and [name] is not empty,
+   * the offset of the period before the constructor name.  Otherwise zero.
+   */
+  void set periodOffset(int value) {
+    assert(value == null || value >= 0);
+    this._periodOffset = value;
+  }
+
+  @override
+  EntityRefBuilder get redirectedConstructor => _redirectedConstructor;
+
+  /**
+   * If [isRedirectedConstructor] and [isFactory] are both `true`, the
+   * constructor to which this constructor redirects; otherwise empty.
+   */
+  void set redirectedConstructor(EntityRefBuilder value) {
+    this._redirectedConstructor = value;
+  }
+
+  @override
+  String get redirectedConstructorName => _redirectedConstructorName ??= '';
+
+  /**
+   * If [isRedirectedConstructor] is `true` and [isFactory] is `false`, the
+   * name of the constructor that this constructor redirects to; otherwise
+   * empty.
+   */
+  void set redirectedConstructorName(String value) {
+    this._redirectedConstructorName = value;
+  }
+
+  @override
+  EntityRefBuilder get returnType => _returnType;
+
+  /**
+   * Declared return type of the executable.  Absent if the executable is a
+   * constructor or the return type is implicit.  Absent for executables
+   * associated with variable initializers and closures, since these
+   * executables may have return types that are not accessible via direct
+   * imports.
+   */
+  void set returnType(EntityRefBuilder value) {
+    this._returnType = value;
+  }
+
+  @override
+  List<UnlinkedTypeParamBuilder> get typeParameters => _typeParameters ??= <UnlinkedTypeParamBuilder>[];
+
+  /**
+   * Type parameters of the executable, if any.  Empty if support for generic
+   * method syntax is disabled.
+   */
+  void set typeParameters(List<UnlinkedTypeParamBuilder> value) {
+    this._typeParameters = value;
+  }
+
+  @override
+  int get visibleLength => _visibleLength ??= 0;
+
+  /**
+   * If a local function, the length of the visible range; zero otherwise.
+   */
+  void set visibleLength(int value) {
+    assert(value == null || value >= 0);
+    this._visibleLength = value;
+  }
+
+  @override
+  int get visibleOffset => _visibleOffset ??= 0;
+
+  /**
+   * If a local function, the beginning of the visible range; zero otherwise.
+   */
+  void set visibleOffset(int value) {
+    assert(value == null || value >= 0);
+    this._visibleOffset = value;
+  }
+
+  UnlinkedExecutableBuilder({List<UnlinkedConstBuilder> annotations, UnlinkedConstBuilder bodyExpr, CodeRangeBuilder codeRange, List<UnlinkedConstructorInitializerBuilder> constantInitializers, int constCycleSlot, UnlinkedDocumentationCommentBuilder documentationComment, int inferredReturnTypeSlot, bool isAbstract, bool isAsynchronous, bool isConst, bool isExternal, bool isFactory, bool isGenerator, bool isRedirectedConstructor, bool isStatic, idl.UnlinkedExecutableKind kind, List<UnlinkedExecutableBuilder> localFunctions, List<UnlinkedLabelBuilder> localLabels, List<UnlinkedVariableBuilder> localVariables, String name, int nameEnd, int nameOffset, List<UnlinkedParamBuilder> parameters, int periodOffset, EntityRefBuilder redirectedConstructor, String redirectedConstructorName, EntityRefBuilder returnType, List<UnlinkedTypeParamBuilder> typeParameters, int visibleLength, int visibleOffset})
+    : _annotations = annotations,
+      _bodyExpr = bodyExpr,
+      _codeRange = codeRange,
+      _constantInitializers = constantInitializers,
+      _constCycleSlot = constCycleSlot,
+      _documentationComment = documentationComment,
+      _inferredReturnTypeSlot = inferredReturnTypeSlot,
+      _isAbstract = isAbstract,
+      _isAsynchronous = isAsynchronous,
+      _isConst = isConst,
+      _isExternal = isExternal,
+      _isFactory = isFactory,
+      _isGenerator = isGenerator,
+      _isRedirectedConstructor = isRedirectedConstructor,
+      _isStatic = isStatic,
+      _kind = kind,
+      _localFunctions = localFunctions,
+      _localLabels = localLabels,
+      _localVariables = localVariables,
+      _name = name,
+      _nameEnd = nameEnd,
+      _nameOffset = nameOffset,
+      _parameters = parameters,
+      _periodOffset = periodOffset,
+      _redirectedConstructor = redirectedConstructor,
+      _redirectedConstructorName = redirectedConstructorName,
+      _returnType = returnType,
+      _typeParameters = typeParameters,
+      _visibleLength = visibleLength,
+      _visibleOffset = visibleOffset;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _annotations?.forEach((b) => b.flushInformative());
+    _bodyExpr?.flushInformative();
+    _codeRange = null;
+    _constantInitializers?.forEach((b) => b.flushInformative());
+    _documentationComment = null;
+    _isAsynchronous = null;
+    _isGenerator = null;
+    _localFunctions?.forEach((b) => b.flushInformative());
+    _localLabels = null;
+    _localVariables = null;
+    _nameEnd = null;
+    _nameOffset = null;
+    _parameters?.forEach((b) => b.flushInformative());
+    _periodOffset = null;
+    _redirectedConstructor?.flushInformative();
+    _returnType?.flushInformative();
+    _typeParameters?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    if (this._parameters == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._parameters.length);
+      for (var x in this._parameters) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addBool(this._returnType != null);
+    this._returnType?.collectApiSignature(signature);
+    signature.addInt(this._kind == null ? 0 : this._kind.index);
+    signature.addInt(this._inferredReturnTypeSlot ?? 0);
+    if (this._annotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._annotations.length);
+      for (var x in this._annotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addBool(this._isFactory == true);
+    signature.addBool(this._isStatic == true);
+    signature.addBool(this._isAbstract == true);
+    signature.addBool(this._isExternal == true);
+    signature.addBool(this._isConst == true);
+    signature.addBool(this._isRedirectedConstructor == true);
+    if (this._constantInitializers == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._constantInitializers.length);
+      for (var x in this._constantInitializers) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addBool(this._redirectedConstructor != null);
+    this._redirectedConstructor?.collectApiSignature(signature);
+    if (this._typeParameters == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._typeParameters.length);
+      for (var x in this._typeParameters) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addString(this._redirectedConstructorName ?? '');
+    if (this._localFunctions == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._localFunctions.length);
+      for (var x in this._localFunctions) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addInt(this._visibleLength ?? 0);
+    signature.addInt(this._visibleOffset ?? 0);
+    signature.addInt(this._constCycleSlot ?? 0);
+    signature.addBool(this._bodyExpr != null);
+    this._bodyExpr?.collectApiSignature(signature);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_annotations;
+    fb.Offset offset_bodyExpr;
+    fb.Offset offset_codeRange;
+    fb.Offset offset_constantInitializers;
+    fb.Offset offset_documentationComment;
+    fb.Offset offset_localFunctions;
+    fb.Offset offset_localLabels;
+    fb.Offset offset_localVariables;
+    fb.Offset offset_name;
+    fb.Offset offset_parameters;
+    fb.Offset offset_redirectedConstructor;
+    fb.Offset offset_redirectedConstructorName;
+    fb.Offset offset_returnType;
+    fb.Offset offset_typeParameters;
+    if (!(_annotations == null || _annotations.isEmpty)) {
+      offset_annotations = fbBuilder.writeList(_annotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_bodyExpr != null) {
+      offset_bodyExpr = _bodyExpr.finish(fbBuilder);
+    }
+    if (_codeRange != null) {
+      offset_codeRange = _codeRange.finish(fbBuilder);
+    }
+    if (!(_constantInitializers == null || _constantInitializers.isEmpty)) {
+      offset_constantInitializers = fbBuilder.writeList(_constantInitializers.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_documentationComment != null) {
+      offset_documentationComment = _documentationComment.finish(fbBuilder);
+    }
+    if (!(_localFunctions == null || _localFunctions.isEmpty)) {
+      offset_localFunctions = fbBuilder.writeList(_localFunctions.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_localLabels == null || _localLabels.isEmpty)) {
+      offset_localLabels = fbBuilder.writeList(_localLabels.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_localVariables == null || _localVariables.isEmpty)) {
+      offset_localVariables = fbBuilder.writeList(_localVariables.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    if (!(_parameters == null || _parameters.isEmpty)) {
+      offset_parameters = fbBuilder.writeList(_parameters.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_redirectedConstructor != null) {
+      offset_redirectedConstructor = _redirectedConstructor.finish(fbBuilder);
+    }
+    if (_redirectedConstructorName != null) {
+      offset_redirectedConstructorName = fbBuilder.writeString(_redirectedConstructorName);
+    }
+    if (_returnType != null) {
+      offset_returnType = _returnType.finish(fbBuilder);
+    }
+    if (!(_typeParameters == null || _typeParameters.isEmpty)) {
+      offset_typeParameters = fbBuilder.writeList(_typeParameters.map((b) => b.finish(fbBuilder)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_annotations != null) {
+      fbBuilder.addOffset(6, offset_annotations);
+    }
+    if (offset_bodyExpr != null) {
+      fbBuilder.addOffset(29, offset_bodyExpr);
+    }
+    if (offset_codeRange != null) {
+      fbBuilder.addOffset(26, offset_codeRange);
+    }
+    if (offset_constantInitializers != null) {
+      fbBuilder.addOffset(14, offset_constantInitializers);
+    }
+    if (_constCycleSlot != null && _constCycleSlot != 0) {
+      fbBuilder.addUint32(25, _constCycleSlot);
+    }
+    if (offset_documentationComment != null) {
+      fbBuilder.addOffset(7, offset_documentationComment);
+    }
+    if (_inferredReturnTypeSlot != null && _inferredReturnTypeSlot != 0) {
+      fbBuilder.addUint32(5, _inferredReturnTypeSlot);
+    }
+    if (_isAbstract == true) {
+      fbBuilder.addBool(10, true);
+    }
+    if (_isAsynchronous == true) {
+      fbBuilder.addBool(27, true);
+    }
+    if (_isConst == true) {
+      fbBuilder.addBool(12, true);
+    }
+    if (_isExternal == true) {
+      fbBuilder.addBool(11, true);
+    }
+    if (_isFactory == true) {
+      fbBuilder.addBool(8, true);
+    }
+    if (_isGenerator == true) {
+      fbBuilder.addBool(28, true);
+    }
+    if (_isRedirectedConstructor == true) {
+      fbBuilder.addBool(13, true);
+    }
+    if (_isStatic == true) {
+      fbBuilder.addBool(9, true);
+    }
+    if (_kind != null && _kind != idl.UnlinkedExecutableKind.functionOrMethod) {
+      fbBuilder.addUint8(4, _kind.index);
+    }
+    if (offset_localFunctions != null) {
+      fbBuilder.addOffset(18, offset_localFunctions);
+    }
+    if (offset_localLabels != null) {
+      fbBuilder.addOffset(22, offset_localLabels);
+    }
+    if (offset_localVariables != null) {
+      fbBuilder.addOffset(19, offset_localVariables);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(1, offset_name);
+    }
+    if (_nameEnd != null && _nameEnd != 0) {
+      fbBuilder.addUint32(23, _nameEnd);
+    }
+    if (_nameOffset != null && _nameOffset != 0) {
+      fbBuilder.addUint32(0, _nameOffset);
+    }
+    if (offset_parameters != null) {
+      fbBuilder.addOffset(2, offset_parameters);
+    }
+    if (_periodOffset != null && _periodOffset != 0) {
+      fbBuilder.addUint32(24, _periodOffset);
+    }
+    if (offset_redirectedConstructor != null) {
+      fbBuilder.addOffset(15, offset_redirectedConstructor);
+    }
+    if (offset_redirectedConstructorName != null) {
+      fbBuilder.addOffset(17, offset_redirectedConstructorName);
+    }
+    if (offset_returnType != null) {
+      fbBuilder.addOffset(3, offset_returnType);
+    }
+    if (offset_typeParameters != null) {
+      fbBuilder.addOffset(16, offset_typeParameters);
+    }
+    if (_visibleLength != null && _visibleLength != 0) {
+      fbBuilder.addUint32(20, _visibleLength);
+    }
+    if (_visibleOffset != null && _visibleOffset != 0) {
+      fbBuilder.addUint32(21, _visibleOffset);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedExecutableReader extends fb.TableReader<_UnlinkedExecutableImpl> {
+  const _UnlinkedExecutableReader();
+
+  @override
+  _UnlinkedExecutableImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedExecutableImpl(bc, offset);
+}
+
+class _UnlinkedExecutableImpl extends Object with _UnlinkedExecutableMixin implements idl.UnlinkedExecutable {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedExecutableImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedConst> _annotations;
+  idl.UnlinkedConst _bodyExpr;
+  idl.CodeRange _codeRange;
+  List<idl.UnlinkedConstructorInitializer> _constantInitializers;
+  int _constCycleSlot;
+  idl.UnlinkedDocumentationComment _documentationComment;
+  int _inferredReturnTypeSlot;
+  bool _isAbstract;
+  bool _isAsynchronous;
+  bool _isConst;
+  bool _isExternal;
+  bool _isFactory;
+  bool _isGenerator;
+  bool _isRedirectedConstructor;
+  bool _isStatic;
+  idl.UnlinkedExecutableKind _kind;
+  List<idl.UnlinkedExecutable> _localFunctions;
+  List<idl.UnlinkedLabel> _localLabels;
+  List<idl.UnlinkedVariable> _localVariables;
+  String _name;
+  int _nameEnd;
+  int _nameOffset;
+  List<idl.UnlinkedParam> _parameters;
+  int _periodOffset;
+  idl.EntityRef _redirectedConstructor;
+  String _redirectedConstructorName;
+  idl.EntityRef _returnType;
+  List<idl.UnlinkedTypeParam> _typeParameters;
+  int _visibleLength;
+  int _visibleOffset;
+
+  @override
+  List<idl.UnlinkedConst> get annotations {
+    _annotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 6, const <idl.UnlinkedConst>[]);
+    return _annotations;
+  }
+
+  @override
+  idl.UnlinkedConst get bodyExpr {
+    _bodyExpr ??= const _UnlinkedConstReader().vTableGet(_bc, _bcOffset, 29, null);
+    return _bodyExpr;
+  }
+
+  @override
+  idl.CodeRange get codeRange {
+    _codeRange ??= const _CodeRangeReader().vTableGet(_bc, _bcOffset, 26, null);
+    return _codeRange;
+  }
+
+  @override
+  List<idl.UnlinkedConstructorInitializer> get constantInitializers {
+    _constantInitializers ??= const fb.ListReader<idl.UnlinkedConstructorInitializer>(const _UnlinkedConstructorInitializerReader()).vTableGet(_bc, _bcOffset, 14, const <idl.UnlinkedConstructorInitializer>[]);
+    return _constantInitializers;
+  }
+
+  @override
+  int get constCycleSlot {
+    _constCycleSlot ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 25, 0);
+    return _constCycleSlot;
+  }
+
+  @override
+  idl.UnlinkedDocumentationComment get documentationComment {
+    _documentationComment ??= const _UnlinkedDocumentationCommentReader().vTableGet(_bc, _bcOffset, 7, null);
+    return _documentationComment;
+  }
+
+  @override
+  int get inferredReturnTypeSlot {
+    _inferredReturnTypeSlot ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 5, 0);
+    return _inferredReturnTypeSlot;
+  }
+
+  @override
+  bool get isAbstract {
+    _isAbstract ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 10, false);
+    return _isAbstract;
+  }
+
+  @override
+  bool get isAsynchronous {
+    _isAsynchronous ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 27, false);
+    return _isAsynchronous;
+  }
+
+  @override
+  bool get isConst {
+    _isConst ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 12, false);
+    return _isConst;
+  }
+
+  @override
+  bool get isExternal {
+    _isExternal ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 11, false);
+    return _isExternal;
+  }
+
+  @override
+  bool get isFactory {
+    _isFactory ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 8, false);
+    return _isFactory;
+  }
+
+  @override
+  bool get isGenerator {
+    _isGenerator ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 28, false);
+    return _isGenerator;
+  }
+
+  @override
+  bool get isRedirectedConstructor {
+    _isRedirectedConstructor ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 13, false);
+    return _isRedirectedConstructor;
+  }
+
+  @override
+  bool get isStatic {
+    _isStatic ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 9, false);
+    return _isStatic;
+  }
+
+  @override
+  idl.UnlinkedExecutableKind get kind {
+    _kind ??= const _UnlinkedExecutableKindReader().vTableGet(_bc, _bcOffset, 4, idl.UnlinkedExecutableKind.functionOrMethod);
+    return _kind;
+  }
+
+  @override
+  List<idl.UnlinkedExecutable> get localFunctions {
+    _localFunctions ??= const fb.ListReader<idl.UnlinkedExecutable>(const _UnlinkedExecutableReader()).vTableGet(_bc, _bcOffset, 18, const <idl.UnlinkedExecutable>[]);
+    return _localFunctions;
+  }
+
+  @override
+  List<idl.UnlinkedLabel> get localLabels {
+    _localLabels ??= const fb.ListReader<idl.UnlinkedLabel>(const _UnlinkedLabelReader()).vTableGet(_bc, _bcOffset, 22, const <idl.UnlinkedLabel>[]);
+    return _localLabels;
+  }
+
+  @override
+  List<idl.UnlinkedVariable> get localVariables {
+    _localVariables ??= const fb.ListReader<idl.UnlinkedVariable>(const _UnlinkedVariableReader()).vTableGet(_bc, _bcOffset, 19, const <idl.UnlinkedVariable>[]);
+    return _localVariables;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 1, '');
+    return _name;
+  }
+
+  @override
+  int get nameEnd {
+    _nameEnd ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 23, 0);
+    return _nameEnd;
+  }
+
+  @override
+  int get nameOffset {
+    _nameOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 0, 0);
+    return _nameOffset;
+  }
+
+  @override
+  List<idl.UnlinkedParam> get parameters {
+    _parameters ??= const fb.ListReader<idl.UnlinkedParam>(const _UnlinkedParamReader()).vTableGet(_bc, _bcOffset, 2, const <idl.UnlinkedParam>[]);
+    return _parameters;
+  }
+
+  @override
+  int get periodOffset {
+    _periodOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 24, 0);
+    return _periodOffset;
+  }
+
+  @override
+  idl.EntityRef get redirectedConstructor {
+    _redirectedConstructor ??= const _EntityRefReader().vTableGet(_bc, _bcOffset, 15, null);
+    return _redirectedConstructor;
+  }
+
+  @override
+  String get redirectedConstructorName {
+    _redirectedConstructorName ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 17, '');
+    return _redirectedConstructorName;
+  }
+
+  @override
+  idl.EntityRef get returnType {
+    _returnType ??= const _EntityRefReader().vTableGet(_bc, _bcOffset, 3, null);
+    return _returnType;
+  }
+
+  @override
+  List<idl.UnlinkedTypeParam> get typeParameters {
+    _typeParameters ??= const fb.ListReader<idl.UnlinkedTypeParam>(const _UnlinkedTypeParamReader()).vTableGet(_bc, _bcOffset, 16, const <idl.UnlinkedTypeParam>[]);
+    return _typeParameters;
+  }
+
+  @override
+  int get visibleLength {
+    _visibleLength ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 20, 0);
+    return _visibleLength;
+  }
+
+  @override
+  int get visibleOffset {
+    _visibleOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 21, 0);
+    return _visibleOffset;
+  }
+}
+
+abstract class _UnlinkedExecutableMixin implements idl.UnlinkedExecutable {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (annotations.isNotEmpty) _result["annotations"] = annotations.map((_value) => _value.toJson()).toList();
+    if (bodyExpr != null) _result["bodyExpr"] = bodyExpr.toJson();
+    if (codeRange != null) _result["codeRange"] = codeRange.toJson();
+    if (constantInitializers.isNotEmpty) _result["constantInitializers"] = constantInitializers.map((_value) => _value.toJson()).toList();
+    if (constCycleSlot != 0) _result["constCycleSlot"] = constCycleSlot;
+    if (documentationComment != null) _result["documentationComment"] = documentationComment.toJson();
+    if (inferredReturnTypeSlot != 0) _result["inferredReturnTypeSlot"] = inferredReturnTypeSlot;
+    if (isAbstract != false) _result["isAbstract"] = isAbstract;
+    if (isAsynchronous != false) _result["isAsynchronous"] = isAsynchronous;
+    if (isConst != false) _result["isConst"] = isConst;
+    if (isExternal != false) _result["isExternal"] = isExternal;
+    if (isFactory != false) _result["isFactory"] = isFactory;
+    if (isGenerator != false) _result["isGenerator"] = isGenerator;
+    if (isRedirectedConstructor != false) _result["isRedirectedConstructor"] = isRedirectedConstructor;
+    if (isStatic != false) _result["isStatic"] = isStatic;
+    if (kind != idl.UnlinkedExecutableKind.functionOrMethod) _result["kind"] = kind.toString().split('.')[1];
+    if (localFunctions.isNotEmpty) _result["localFunctions"] = localFunctions.map((_value) => _value.toJson()).toList();
+    if (localLabels.isNotEmpty) _result["localLabels"] = localLabels.map((_value) => _value.toJson()).toList();
+    if (localVariables.isNotEmpty) _result["localVariables"] = localVariables.map((_value) => _value.toJson()).toList();
+    if (name != '') _result["name"] = name;
+    if (nameEnd != 0) _result["nameEnd"] = nameEnd;
+    if (nameOffset != 0) _result["nameOffset"] = nameOffset;
+    if (parameters.isNotEmpty) _result["parameters"] = parameters.map((_value) => _value.toJson()).toList();
+    if (periodOffset != 0) _result["periodOffset"] = periodOffset;
+    if (redirectedConstructor != null) _result["redirectedConstructor"] = redirectedConstructor.toJson();
+    if (redirectedConstructorName != '') _result["redirectedConstructorName"] = redirectedConstructorName;
+    if (returnType != null) _result["returnType"] = returnType.toJson();
+    if (typeParameters.isNotEmpty) _result["typeParameters"] = typeParameters.map((_value) => _value.toJson()).toList();
+    if (visibleLength != 0) _result["visibleLength"] = visibleLength;
+    if (visibleOffset != 0) _result["visibleOffset"] = visibleOffset;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "annotations": annotations,
+    "bodyExpr": bodyExpr,
+    "codeRange": codeRange,
+    "constantInitializers": constantInitializers,
+    "constCycleSlot": constCycleSlot,
+    "documentationComment": documentationComment,
+    "inferredReturnTypeSlot": inferredReturnTypeSlot,
+    "isAbstract": isAbstract,
+    "isAsynchronous": isAsynchronous,
+    "isConst": isConst,
+    "isExternal": isExternal,
+    "isFactory": isFactory,
+    "isGenerator": isGenerator,
+    "isRedirectedConstructor": isRedirectedConstructor,
+    "isStatic": isStatic,
+    "kind": kind,
+    "localFunctions": localFunctions,
+    "localLabels": localLabels,
+    "localVariables": localVariables,
+    "name": name,
+    "nameEnd": nameEnd,
+    "nameOffset": nameOffset,
+    "parameters": parameters,
+    "periodOffset": periodOffset,
+    "redirectedConstructor": redirectedConstructor,
+    "redirectedConstructorName": redirectedConstructorName,
+    "returnType": returnType,
+    "typeParameters": typeParameters,
+    "visibleLength": visibleLength,
+    "visibleOffset": visibleOffset,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedExportNonPublicBuilder extends Object with _UnlinkedExportNonPublicMixin implements idl.UnlinkedExportNonPublic {
+  List<UnlinkedConstBuilder> _annotations;
+  int _offset;
+  int _uriEnd;
+  int _uriOffset;
+
+  @override
+  List<UnlinkedConstBuilder> get annotations => _annotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for this export directive.
+   */
+  void set annotations(List<UnlinkedConstBuilder> value) {
+    this._annotations = value;
+  }
+
+  @override
+  int get offset => _offset ??= 0;
+
+  /**
+   * Offset of the "export" keyword.
+   */
+  void set offset(int value) {
+    assert(value == null || value >= 0);
+    this._offset = value;
+  }
+
+  @override
+  int get uriEnd => _uriEnd ??= 0;
+
+  /**
+   * End of the URI string (including quotes) relative to the beginning of the
+   * file.
+   */
+  void set uriEnd(int value) {
+    assert(value == null || value >= 0);
+    this._uriEnd = value;
+  }
+
+  @override
+  int get uriOffset => _uriOffset ??= 0;
+
+  /**
+   * Offset of the URI string (including quotes) relative to the beginning of
+   * the file.
+   */
+  void set uriOffset(int value) {
+    assert(value == null || value >= 0);
+    this._uriOffset = value;
+  }
+
+  UnlinkedExportNonPublicBuilder({List<UnlinkedConstBuilder> annotations, int offset, int uriEnd, int uriOffset})
+    : _annotations = annotations,
+      _offset = offset,
+      _uriEnd = uriEnd,
+      _uriOffset = uriOffset;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _annotations?.forEach((b) => b.flushInformative());
+    _offset = null;
+    _uriEnd = null;
+    _uriOffset = null;
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    if (this._annotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._annotations.length);
+      for (var x in this._annotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_annotations;
+    if (!(_annotations == null || _annotations.isEmpty)) {
+      offset_annotations = fbBuilder.writeList(_annotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_annotations != null) {
+      fbBuilder.addOffset(3, offset_annotations);
+    }
+    if (_offset != null && _offset != 0) {
+      fbBuilder.addUint32(0, _offset);
+    }
+    if (_uriEnd != null && _uriEnd != 0) {
+      fbBuilder.addUint32(1, _uriEnd);
+    }
+    if (_uriOffset != null && _uriOffset != 0) {
+      fbBuilder.addUint32(2, _uriOffset);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedExportNonPublicReader extends fb.TableReader<_UnlinkedExportNonPublicImpl> {
+  const _UnlinkedExportNonPublicReader();
+
+  @override
+  _UnlinkedExportNonPublicImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedExportNonPublicImpl(bc, offset);
+}
+
+class _UnlinkedExportNonPublicImpl extends Object with _UnlinkedExportNonPublicMixin implements idl.UnlinkedExportNonPublic {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedExportNonPublicImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedConst> _annotations;
+  int _offset;
+  int _uriEnd;
+  int _uriOffset;
+
+  @override
+  List<idl.UnlinkedConst> get annotations {
+    _annotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 3, const <idl.UnlinkedConst>[]);
+    return _annotations;
+  }
+
+  @override
+  int get offset {
+    _offset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 0, 0);
+    return _offset;
+  }
+
+  @override
+  int get uriEnd {
+    _uriEnd ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _uriEnd;
+  }
+
+  @override
+  int get uriOffset {
+    _uriOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 2, 0);
+    return _uriOffset;
+  }
+}
+
+abstract class _UnlinkedExportNonPublicMixin implements idl.UnlinkedExportNonPublic {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (annotations.isNotEmpty) _result["annotations"] = annotations.map((_value) => _value.toJson()).toList();
+    if (offset != 0) _result["offset"] = offset;
+    if (uriEnd != 0) _result["uriEnd"] = uriEnd;
+    if (uriOffset != 0) _result["uriOffset"] = uriOffset;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "annotations": annotations,
+    "offset": offset,
+    "uriEnd": uriEnd,
+    "uriOffset": uriOffset,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedExportPublicBuilder extends Object with _UnlinkedExportPublicMixin implements idl.UnlinkedExportPublic {
+  List<UnlinkedCombinatorBuilder> _combinators;
+  List<UnlinkedConfigurationBuilder> _configurations;
+  String _uri;
+
+  @override
+  List<UnlinkedCombinatorBuilder> get combinators => _combinators ??= <UnlinkedCombinatorBuilder>[];
+
+  /**
+   * Combinators contained in this export declaration.
+   */
+  void set combinators(List<UnlinkedCombinatorBuilder> value) {
+    this._combinators = value;
+  }
+
+  @override
+  List<UnlinkedConfigurationBuilder> get configurations => _configurations ??= <UnlinkedConfigurationBuilder>[];
+
+  /**
+   * Configurations used to control which library will actually be loaded at
+   * run-time.
+   */
+  void set configurations(List<UnlinkedConfigurationBuilder> value) {
+    this._configurations = value;
+  }
+
+  @override
+  String get uri => _uri ??= '';
+
+  /**
+   * URI used in the source code to reference the exported library.
+   */
+  void set uri(String value) {
+    this._uri = value;
+  }
+
+  UnlinkedExportPublicBuilder({List<UnlinkedCombinatorBuilder> combinators, List<UnlinkedConfigurationBuilder> configurations, String uri})
+    : _combinators = combinators,
+      _configurations = configurations,
+      _uri = uri;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _combinators?.forEach((b) => b.flushInformative());
+    _configurations?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._uri ?? '');
+    if (this._combinators == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._combinators.length);
+      for (var x in this._combinators) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._configurations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._configurations.length);
+      for (var x in this._configurations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_combinators;
+    fb.Offset offset_configurations;
+    fb.Offset offset_uri;
+    if (!(_combinators == null || _combinators.isEmpty)) {
+      offset_combinators = fbBuilder.writeList(_combinators.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_configurations == null || _configurations.isEmpty)) {
+      offset_configurations = fbBuilder.writeList(_configurations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_uri != null) {
+      offset_uri = fbBuilder.writeString(_uri);
+    }
+    fbBuilder.startTable();
+    if (offset_combinators != null) {
+      fbBuilder.addOffset(1, offset_combinators);
+    }
+    if (offset_configurations != null) {
+      fbBuilder.addOffset(2, offset_configurations);
+    }
+    if (offset_uri != null) {
+      fbBuilder.addOffset(0, offset_uri);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedExportPublicReader extends fb.TableReader<_UnlinkedExportPublicImpl> {
+  const _UnlinkedExportPublicReader();
+
+  @override
+  _UnlinkedExportPublicImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedExportPublicImpl(bc, offset);
+}
+
+class _UnlinkedExportPublicImpl extends Object with _UnlinkedExportPublicMixin implements idl.UnlinkedExportPublic {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedExportPublicImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedCombinator> _combinators;
+  List<idl.UnlinkedConfiguration> _configurations;
+  String _uri;
+
+  @override
+  List<idl.UnlinkedCombinator> get combinators {
+    _combinators ??= const fb.ListReader<idl.UnlinkedCombinator>(const _UnlinkedCombinatorReader()).vTableGet(_bc, _bcOffset, 1, const <idl.UnlinkedCombinator>[]);
+    return _combinators;
+  }
+
+  @override
+  List<idl.UnlinkedConfiguration> get configurations {
+    _configurations ??= const fb.ListReader<idl.UnlinkedConfiguration>(const _UnlinkedConfigurationReader()).vTableGet(_bc, _bcOffset, 2, const <idl.UnlinkedConfiguration>[]);
+    return _configurations;
+  }
+
+  @override
+  String get uri {
+    _uri ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _uri;
+  }
+}
+
+abstract class _UnlinkedExportPublicMixin implements idl.UnlinkedExportPublic {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (combinators.isNotEmpty) _result["combinators"] = combinators.map((_value) => _value.toJson()).toList();
+    if (configurations.isNotEmpty) _result["configurations"] = configurations.map((_value) => _value.toJson()).toList();
+    if (uri != '') _result["uri"] = uri;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "combinators": combinators,
+    "configurations": configurations,
+    "uri": uri,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedImportBuilder extends Object with _UnlinkedImportMixin implements idl.UnlinkedImport {
+  List<UnlinkedConstBuilder> _annotations;
+  List<UnlinkedCombinatorBuilder> _combinators;
+  List<UnlinkedConfigurationBuilder> _configurations;
+  bool _isDeferred;
+  bool _isImplicit;
+  int _offset;
+  int _prefixOffset;
+  int _prefixReference;
+  String _uri;
+  int _uriEnd;
+  int _uriOffset;
+
+  @override
+  List<UnlinkedConstBuilder> get annotations => _annotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for this import declaration.
+   */
+  void set annotations(List<UnlinkedConstBuilder> value) {
+    this._annotations = value;
+  }
+
+  @override
+  List<UnlinkedCombinatorBuilder> get combinators => _combinators ??= <UnlinkedCombinatorBuilder>[];
+
+  /**
+   * Combinators contained in this import declaration.
+   */
+  void set combinators(List<UnlinkedCombinatorBuilder> value) {
+    this._combinators = value;
+  }
+
+  @override
+  List<UnlinkedConfigurationBuilder> get configurations => _configurations ??= <UnlinkedConfigurationBuilder>[];
+
+  /**
+   * Configurations used to control which library will actually be loaded at
+   * run-time.
+   */
+  void set configurations(List<UnlinkedConfigurationBuilder> value) {
+    this._configurations = value;
+  }
+
+  @override
+  bool get isDeferred => _isDeferred ??= false;
+
+  /**
+   * Indicates whether the import declaration uses the `deferred` keyword.
+   */
+  void set isDeferred(bool value) {
+    this._isDeferred = value;
+  }
+
+  @override
+  bool get isImplicit => _isImplicit ??= false;
+
+  /**
+   * Indicates whether the import declaration is implicit.
+   */
+  void set isImplicit(bool value) {
+    this._isImplicit = value;
+  }
+
+  @override
+  int get offset => _offset ??= 0;
+
+  /**
+   * If [isImplicit] is false, offset of the "import" keyword.  If [isImplicit]
+   * is true, zero.
+   */
+  void set offset(int value) {
+    assert(value == null || value >= 0);
+    this._offset = value;
+  }
+
+  @override
+  int get prefixOffset => _prefixOffset ??= 0;
+
+  /**
+   * Offset of the prefix name relative to the beginning of the file, or zero
+   * if there is no prefix.
+   */
+  void set prefixOffset(int value) {
+    assert(value == null || value >= 0);
+    this._prefixOffset = value;
+  }
+
+  @override
+  int get prefixReference => _prefixReference ??= 0;
+
+  /**
+   * Index into [UnlinkedUnit.references] of the prefix declared by this
+   * import declaration, or zero if this import declaration declares no prefix.
+   *
+   * Note that multiple imports can declare the same prefix.
+   */
+  void set prefixReference(int value) {
+    assert(value == null || value >= 0);
+    this._prefixReference = value;
+  }
+
+  @override
+  String get uri => _uri ??= '';
+
+  /**
+   * URI used in the source code to reference the imported library.
+   */
+  void set uri(String value) {
+    this._uri = value;
+  }
+
+  @override
+  int get uriEnd => _uriEnd ??= 0;
+
+  /**
+   * End of the URI string (including quotes) relative to the beginning of the
+   * file.  If [isImplicit] is true, zero.
+   */
+  void set uriEnd(int value) {
+    assert(value == null || value >= 0);
+    this._uriEnd = value;
+  }
+
+  @override
+  int get uriOffset => _uriOffset ??= 0;
+
+  /**
+   * Offset of the URI string (including quotes) relative to the beginning of
+   * the file.  If [isImplicit] is true, zero.
+   */
+  void set uriOffset(int value) {
+    assert(value == null || value >= 0);
+    this._uriOffset = value;
+  }
+
+  UnlinkedImportBuilder({List<UnlinkedConstBuilder> annotations, List<UnlinkedCombinatorBuilder> combinators, List<UnlinkedConfigurationBuilder> configurations, bool isDeferred, bool isImplicit, int offset, int prefixOffset, int prefixReference, String uri, int uriEnd, int uriOffset})
+    : _annotations = annotations,
+      _combinators = combinators,
+      _configurations = configurations,
+      _isDeferred = isDeferred,
+      _isImplicit = isImplicit,
+      _offset = offset,
+      _prefixOffset = prefixOffset,
+      _prefixReference = prefixReference,
+      _uri = uri,
+      _uriEnd = uriEnd,
+      _uriOffset = uriOffset;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _annotations?.forEach((b) => b.flushInformative());
+    _combinators?.forEach((b) => b.flushInformative());
+    _configurations?.forEach((b) => b.flushInformative());
+    _offset = null;
+    _prefixOffset = null;
+    _uriEnd = null;
+    _uriOffset = null;
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._uri ?? '');
+    if (this._combinators == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._combinators.length);
+      for (var x in this._combinators) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addBool(this._isImplicit == true);
+    signature.addInt(this._prefixReference ?? 0);
+    if (this._annotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._annotations.length);
+      for (var x in this._annotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addBool(this._isDeferred == true);
+    if (this._configurations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._configurations.length);
+      for (var x in this._configurations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_annotations;
+    fb.Offset offset_combinators;
+    fb.Offset offset_configurations;
+    fb.Offset offset_uri;
+    if (!(_annotations == null || _annotations.isEmpty)) {
+      offset_annotations = fbBuilder.writeList(_annotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_combinators == null || _combinators.isEmpty)) {
+      offset_combinators = fbBuilder.writeList(_combinators.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_configurations == null || _configurations.isEmpty)) {
+      offset_configurations = fbBuilder.writeList(_configurations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_uri != null) {
+      offset_uri = fbBuilder.writeString(_uri);
+    }
+    fbBuilder.startTable();
+    if (offset_annotations != null) {
+      fbBuilder.addOffset(8, offset_annotations);
+    }
+    if (offset_combinators != null) {
+      fbBuilder.addOffset(4, offset_combinators);
+    }
+    if (offset_configurations != null) {
+      fbBuilder.addOffset(10, offset_configurations);
+    }
+    if (_isDeferred == true) {
+      fbBuilder.addBool(9, true);
+    }
+    if (_isImplicit == true) {
+      fbBuilder.addBool(5, true);
+    }
+    if (_offset != null && _offset != 0) {
+      fbBuilder.addUint32(0, _offset);
+    }
+    if (_prefixOffset != null && _prefixOffset != 0) {
+      fbBuilder.addUint32(6, _prefixOffset);
+    }
+    if (_prefixReference != null && _prefixReference != 0) {
+      fbBuilder.addUint32(7, _prefixReference);
+    }
+    if (offset_uri != null) {
+      fbBuilder.addOffset(1, offset_uri);
+    }
+    if (_uriEnd != null && _uriEnd != 0) {
+      fbBuilder.addUint32(2, _uriEnd);
+    }
+    if (_uriOffset != null && _uriOffset != 0) {
+      fbBuilder.addUint32(3, _uriOffset);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedImportReader extends fb.TableReader<_UnlinkedImportImpl> {
+  const _UnlinkedImportReader();
+
+  @override
+  _UnlinkedImportImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedImportImpl(bc, offset);
+}
+
+class _UnlinkedImportImpl extends Object with _UnlinkedImportMixin implements idl.UnlinkedImport {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedImportImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedConst> _annotations;
+  List<idl.UnlinkedCombinator> _combinators;
+  List<idl.UnlinkedConfiguration> _configurations;
+  bool _isDeferred;
+  bool _isImplicit;
+  int _offset;
+  int _prefixOffset;
+  int _prefixReference;
+  String _uri;
+  int _uriEnd;
+  int _uriOffset;
+
+  @override
+  List<idl.UnlinkedConst> get annotations {
+    _annotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 8, const <idl.UnlinkedConst>[]);
+    return _annotations;
+  }
+
+  @override
+  List<idl.UnlinkedCombinator> get combinators {
+    _combinators ??= const fb.ListReader<idl.UnlinkedCombinator>(const _UnlinkedCombinatorReader()).vTableGet(_bc, _bcOffset, 4, const <idl.UnlinkedCombinator>[]);
+    return _combinators;
+  }
+
+  @override
+  List<idl.UnlinkedConfiguration> get configurations {
+    _configurations ??= const fb.ListReader<idl.UnlinkedConfiguration>(const _UnlinkedConfigurationReader()).vTableGet(_bc, _bcOffset, 10, const <idl.UnlinkedConfiguration>[]);
+    return _configurations;
+  }
+
+  @override
+  bool get isDeferred {
+    _isDeferred ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 9, false);
+    return _isDeferred;
+  }
+
+  @override
+  bool get isImplicit {
+    _isImplicit ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 5, false);
+    return _isImplicit;
+  }
+
+  @override
+  int get offset {
+    _offset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 0, 0);
+    return _offset;
+  }
+
+  @override
+  int get prefixOffset {
+    _prefixOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 6, 0);
+    return _prefixOffset;
+  }
+
+  @override
+  int get prefixReference {
+    _prefixReference ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 7, 0);
+    return _prefixReference;
+  }
+
+  @override
+  String get uri {
+    _uri ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 1, '');
+    return _uri;
+  }
+
+  @override
+  int get uriEnd {
+    _uriEnd ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 2, 0);
+    return _uriEnd;
+  }
+
+  @override
+  int get uriOffset {
+    _uriOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 3, 0);
+    return _uriOffset;
+  }
+}
+
+abstract class _UnlinkedImportMixin implements idl.UnlinkedImport {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (annotations.isNotEmpty) _result["annotations"] = annotations.map((_value) => _value.toJson()).toList();
+    if (combinators.isNotEmpty) _result["combinators"] = combinators.map((_value) => _value.toJson()).toList();
+    if (configurations.isNotEmpty) _result["configurations"] = configurations.map((_value) => _value.toJson()).toList();
+    if (isDeferred != false) _result["isDeferred"] = isDeferred;
+    if (isImplicit != false) _result["isImplicit"] = isImplicit;
+    if (offset != 0) _result["offset"] = offset;
+    if (prefixOffset != 0) _result["prefixOffset"] = prefixOffset;
+    if (prefixReference != 0) _result["prefixReference"] = prefixReference;
+    if (uri != '') _result["uri"] = uri;
+    if (uriEnd != 0) _result["uriEnd"] = uriEnd;
+    if (uriOffset != 0) _result["uriOffset"] = uriOffset;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "annotations": annotations,
+    "combinators": combinators,
+    "configurations": configurations,
+    "isDeferred": isDeferred,
+    "isImplicit": isImplicit,
+    "offset": offset,
+    "prefixOffset": prefixOffset,
+    "prefixReference": prefixReference,
+    "uri": uri,
+    "uriEnd": uriEnd,
+    "uriOffset": uriOffset,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedLabelBuilder extends Object with _UnlinkedLabelMixin implements idl.UnlinkedLabel {
+  bool _isOnSwitchMember;
+  bool _isOnSwitchStatement;
+  String _name;
+  int _nameOffset;
+
+  @override
+  bool get isOnSwitchMember => _isOnSwitchMember ??= false;
+
+  /**
+   * Return `true` if this label is associated with a `switch` member (`case` or
+   * `default`).
+   */
+  void set isOnSwitchMember(bool value) {
+    this._isOnSwitchMember = value;
+  }
+
+  @override
+  bool get isOnSwitchStatement => _isOnSwitchStatement ??= false;
+
+  /**
+   * Return `true` if this label is associated with a `switch` statement.
+   */
+  void set isOnSwitchStatement(bool value) {
+    this._isOnSwitchStatement = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the label.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get nameOffset => _nameOffset ??= 0;
+
+  /**
+   * Offset of the label relative to the beginning of the file.
+   */
+  void set nameOffset(int value) {
+    assert(value == null || value >= 0);
+    this._nameOffset = value;
+  }
+
+  UnlinkedLabelBuilder({bool isOnSwitchMember, bool isOnSwitchStatement, String name, int nameOffset})
+    : _isOnSwitchMember = isOnSwitchMember,
+      _isOnSwitchStatement = isOnSwitchStatement,
+      _name = name,
+      _nameOffset = nameOffset;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _nameOffset = null;
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    signature.addBool(this._isOnSwitchMember == true);
+    signature.addBool(this._isOnSwitchStatement == true);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_name;
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    fbBuilder.startTable();
+    if (_isOnSwitchMember == true) {
+      fbBuilder.addBool(2, true);
+    }
+    if (_isOnSwitchStatement == true) {
+      fbBuilder.addBool(3, true);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (_nameOffset != null && _nameOffset != 0) {
+      fbBuilder.addUint32(1, _nameOffset);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedLabelReader extends fb.TableReader<_UnlinkedLabelImpl> {
+  const _UnlinkedLabelReader();
+
+  @override
+  _UnlinkedLabelImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedLabelImpl(bc, offset);
+}
+
+class _UnlinkedLabelImpl extends Object with _UnlinkedLabelMixin implements idl.UnlinkedLabel {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedLabelImpl(this._bc, this._bcOffset);
+
+  bool _isOnSwitchMember;
+  bool _isOnSwitchStatement;
+  String _name;
+  int _nameOffset;
+
+  @override
+  bool get isOnSwitchMember {
+    _isOnSwitchMember ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 2, false);
+    return _isOnSwitchMember;
+  }
+
+  @override
+  bool get isOnSwitchStatement {
+    _isOnSwitchStatement ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 3, false);
+    return _isOnSwitchStatement;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  int get nameOffset {
+    _nameOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _nameOffset;
+  }
+}
+
+abstract class _UnlinkedLabelMixin implements idl.UnlinkedLabel {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (isOnSwitchMember != false) _result["isOnSwitchMember"] = isOnSwitchMember;
+    if (isOnSwitchStatement != false) _result["isOnSwitchStatement"] = isOnSwitchStatement;
+    if (name != '') _result["name"] = name;
+    if (nameOffset != 0) _result["nameOffset"] = nameOffset;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "isOnSwitchMember": isOnSwitchMember,
+    "isOnSwitchStatement": isOnSwitchStatement,
+    "name": name,
+    "nameOffset": nameOffset,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedParamBuilder extends Object with _UnlinkedParamMixin implements idl.UnlinkedParam {
+  List<UnlinkedConstBuilder> _annotations;
+  CodeRangeBuilder _codeRange;
+  String _defaultValueCode;
+  int _inferredTypeSlot;
+  int _inheritsCovariantSlot;
+  UnlinkedExecutableBuilder _initializer;
+  bool _isFunctionTyped;
+  bool _isInitializingFormal;
+  idl.UnlinkedParamKind _kind;
+  String _name;
+  int _nameOffset;
+  List<UnlinkedParamBuilder> _parameters;
+  EntityRefBuilder _type;
+  int _visibleLength;
+  int _visibleOffset;
+
+  @override
+  List<UnlinkedConstBuilder> get annotations => _annotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for this parameter.
+   */
+  void set annotations(List<UnlinkedConstBuilder> value) {
+    this._annotations = value;
+  }
+
+  @override
+  CodeRangeBuilder get codeRange => _codeRange;
+
+  /**
+   * Code range of the parameter.
+   */
+  void set codeRange(CodeRangeBuilder value) {
+    this._codeRange = value;
+  }
+
+  @override
+  String get defaultValueCode => _defaultValueCode ??= '';
+
+  /**
+   * If the parameter has a default value, the source text of the constant
+   * expression in the default value.  Otherwise the empty string.
+   */
+  void set defaultValueCode(String value) {
+    this._defaultValueCode = value;
+  }
+
+  @override
+  int get inferredTypeSlot => _inferredTypeSlot ??= 0;
+
+  /**
+   * If this parameter's type is inferable, nonzero slot id identifying which
+   * entry in [LinkedLibrary.types] contains the inferred type.  If there is no
+   * matching entry in [LinkedLibrary.types], then no type was inferred for
+   * this variable, so its static type is `dynamic`.
+   *
+   * Note that although strong mode considers initializing formals to be
+   * inferable, they are not marked as such in the summary; if their type is
+   * not specified, they always inherit the static type of the corresponding
+   * field.
+   */
+  void set inferredTypeSlot(int value) {
+    assert(value == null || value >= 0);
+    this._inferredTypeSlot = value;
+  }
+
+  @override
+  int get inheritsCovariantSlot => _inheritsCovariantSlot ??= 0;
+
+  /**
+   * If this is a parameter of an instance method, a nonzero slot id which is
+   * unique within this compilation unit.  If this id is found in
+   * [LinkedUnit.parametersInheritingCovariant], then this parameter inherits
+   * `@covariant` behavior from a base class.
+   *
+   * Otherwise, zero.
+   */
+  void set inheritsCovariantSlot(int value) {
+    assert(value == null || value >= 0);
+    this._inheritsCovariantSlot = value;
+  }
+
+  @override
+  UnlinkedExecutableBuilder get initializer => _initializer;
+
+  /**
+   * The synthetic initializer function of the parameter.  Absent if the variable
+   * does not have an initializer.
+   */
+  void set initializer(UnlinkedExecutableBuilder value) {
+    this._initializer = value;
+  }
+
+  @override
+  bool get isFunctionTyped => _isFunctionTyped ??= false;
+
+  /**
+   * Indicates whether this is a function-typed parameter.
+   */
+  void set isFunctionTyped(bool value) {
+    this._isFunctionTyped = value;
+  }
+
+  @override
+  bool get isInitializingFormal => _isInitializingFormal ??= false;
+
+  /**
+   * Indicates whether this is an initializing formal parameter (i.e. it is
+   * declared using `this.` syntax).
+   */
+  void set isInitializingFormal(bool value) {
+    this._isInitializingFormal = value;
+  }
+
+  @override
+  idl.UnlinkedParamKind get kind => _kind ??= idl.UnlinkedParamKind.required;
+
+  /**
+   * Kind of the parameter.
+   */
+  void set kind(idl.UnlinkedParamKind value) {
+    this._kind = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the parameter.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get nameOffset => _nameOffset ??= 0;
+
+  /**
+   * Offset of the parameter name relative to the beginning of the file.
+   */
+  void set nameOffset(int value) {
+    assert(value == null || value >= 0);
+    this._nameOffset = value;
+  }
+
+  @override
+  List<UnlinkedParamBuilder> get parameters => _parameters ??= <UnlinkedParamBuilder>[];
+
+  /**
+   * If [isFunctionTyped] is `true`, the parameters of the function type.
+   */
+  void set parameters(List<UnlinkedParamBuilder> value) {
+    this._parameters = value;
+  }
+
+  @override
+  EntityRefBuilder get type => _type;
+
+  /**
+   * If [isFunctionTyped] is `true`, the declared return type.  If
+   * [isFunctionTyped] is `false`, the declared type.  Absent if the type is
+   * implicit.
+   */
+  void set type(EntityRefBuilder value) {
+    this._type = value;
+  }
+
+  @override
+  int get visibleLength => _visibleLength ??= 0;
+
+  /**
+   * The length of the visible range.
+   */
+  void set visibleLength(int value) {
+    assert(value == null || value >= 0);
+    this._visibleLength = value;
+  }
+
+  @override
+  int get visibleOffset => _visibleOffset ??= 0;
+
+  /**
+   * The beginning of the visible range.
+   */
+  void set visibleOffset(int value) {
+    assert(value == null || value >= 0);
+    this._visibleOffset = value;
+  }
+
+  UnlinkedParamBuilder({List<UnlinkedConstBuilder> annotations, CodeRangeBuilder codeRange, String defaultValueCode, int inferredTypeSlot, int inheritsCovariantSlot, UnlinkedExecutableBuilder initializer, bool isFunctionTyped, bool isInitializingFormal, idl.UnlinkedParamKind kind, String name, int nameOffset, List<UnlinkedParamBuilder> parameters, EntityRefBuilder type, int visibleLength, int visibleOffset})
+    : _annotations = annotations,
+      _codeRange = codeRange,
+      _defaultValueCode = defaultValueCode,
+      _inferredTypeSlot = inferredTypeSlot,
+      _inheritsCovariantSlot = inheritsCovariantSlot,
+      _initializer = initializer,
+      _isFunctionTyped = isFunctionTyped,
+      _isInitializingFormal = isInitializingFormal,
+      _kind = kind,
+      _name = name,
+      _nameOffset = nameOffset,
+      _parameters = parameters,
+      _type = type,
+      _visibleLength = visibleLength,
+      _visibleOffset = visibleOffset;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _annotations?.forEach((b) => b.flushInformative());
+    _codeRange = null;
+    _defaultValueCode = null;
+    _initializer?.flushInformative();
+    _nameOffset = null;
+    _parameters?.forEach((b) => b.flushInformative());
+    _type?.flushInformative();
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    signature.addInt(this._inferredTypeSlot ?? 0);
+    signature.addBool(this._type != null);
+    this._type?.collectApiSignature(signature);
+    signature.addInt(this._kind == null ? 0 : this._kind.index);
+    signature.addBool(this._isFunctionTyped == true);
+    signature.addBool(this._isInitializingFormal == true);
+    if (this._parameters == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._parameters.length);
+      for (var x in this._parameters) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._annotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._annotations.length);
+      for (var x in this._annotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addInt(this._visibleLength ?? 0);
+    signature.addInt(this._visibleOffset ?? 0);
+    signature.addBool(this._initializer != null);
+    this._initializer?.collectApiSignature(signature);
+    signature.addInt(this._inheritsCovariantSlot ?? 0);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_annotations;
+    fb.Offset offset_codeRange;
+    fb.Offset offset_defaultValueCode;
+    fb.Offset offset_initializer;
+    fb.Offset offset_name;
+    fb.Offset offset_parameters;
+    fb.Offset offset_type;
+    if (!(_annotations == null || _annotations.isEmpty)) {
+      offset_annotations = fbBuilder.writeList(_annotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_codeRange != null) {
+      offset_codeRange = _codeRange.finish(fbBuilder);
+    }
+    if (_defaultValueCode != null) {
+      offset_defaultValueCode = fbBuilder.writeString(_defaultValueCode);
+    }
+    if (_initializer != null) {
+      offset_initializer = _initializer.finish(fbBuilder);
+    }
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    if (!(_parameters == null || _parameters.isEmpty)) {
+      offset_parameters = fbBuilder.writeList(_parameters.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_type != null) {
+      offset_type = _type.finish(fbBuilder);
+    }
+    fbBuilder.startTable();
+    if (offset_annotations != null) {
+      fbBuilder.addOffset(9, offset_annotations);
+    }
+    if (offset_codeRange != null) {
+      fbBuilder.addOffset(7, offset_codeRange);
+    }
+    if (offset_defaultValueCode != null) {
+      fbBuilder.addOffset(13, offset_defaultValueCode);
+    }
+    if (_inferredTypeSlot != null && _inferredTypeSlot != 0) {
+      fbBuilder.addUint32(2, _inferredTypeSlot);
+    }
+    if (_inheritsCovariantSlot != null && _inheritsCovariantSlot != 0) {
+      fbBuilder.addUint32(14, _inheritsCovariantSlot);
+    }
+    if (offset_initializer != null) {
+      fbBuilder.addOffset(12, offset_initializer);
+    }
+    if (_isFunctionTyped == true) {
+      fbBuilder.addBool(5, true);
+    }
+    if (_isInitializingFormal == true) {
+      fbBuilder.addBool(6, true);
+    }
+    if (_kind != null && _kind != idl.UnlinkedParamKind.required) {
+      fbBuilder.addUint8(4, _kind.index);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (_nameOffset != null && _nameOffset != 0) {
+      fbBuilder.addUint32(1, _nameOffset);
+    }
+    if (offset_parameters != null) {
+      fbBuilder.addOffset(8, offset_parameters);
+    }
+    if (offset_type != null) {
+      fbBuilder.addOffset(3, offset_type);
+    }
+    if (_visibleLength != null && _visibleLength != 0) {
+      fbBuilder.addUint32(10, _visibleLength);
+    }
+    if (_visibleOffset != null && _visibleOffset != 0) {
+      fbBuilder.addUint32(11, _visibleOffset);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedParamReader extends fb.TableReader<_UnlinkedParamImpl> {
+  const _UnlinkedParamReader();
+
+  @override
+  _UnlinkedParamImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedParamImpl(bc, offset);
+}
+
+class _UnlinkedParamImpl extends Object with _UnlinkedParamMixin implements idl.UnlinkedParam {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedParamImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedConst> _annotations;
+  idl.CodeRange _codeRange;
+  String _defaultValueCode;
+  int _inferredTypeSlot;
+  int _inheritsCovariantSlot;
+  idl.UnlinkedExecutable _initializer;
+  bool _isFunctionTyped;
+  bool _isInitializingFormal;
+  idl.UnlinkedParamKind _kind;
+  String _name;
+  int _nameOffset;
+  List<idl.UnlinkedParam> _parameters;
+  idl.EntityRef _type;
+  int _visibleLength;
+  int _visibleOffset;
+
+  @override
+  List<idl.UnlinkedConst> get annotations {
+    _annotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 9, const <idl.UnlinkedConst>[]);
+    return _annotations;
+  }
+
+  @override
+  idl.CodeRange get codeRange {
+    _codeRange ??= const _CodeRangeReader().vTableGet(_bc, _bcOffset, 7, null);
+    return _codeRange;
+  }
+
+  @override
+  String get defaultValueCode {
+    _defaultValueCode ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 13, '');
+    return _defaultValueCode;
+  }
+
+  @override
+  int get inferredTypeSlot {
+    _inferredTypeSlot ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 2, 0);
+    return _inferredTypeSlot;
+  }
+
+  @override
+  int get inheritsCovariantSlot {
+    _inheritsCovariantSlot ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 14, 0);
+    return _inheritsCovariantSlot;
+  }
+
+  @override
+  idl.UnlinkedExecutable get initializer {
+    _initializer ??= const _UnlinkedExecutableReader().vTableGet(_bc, _bcOffset, 12, null);
+    return _initializer;
+  }
+
+  @override
+  bool get isFunctionTyped {
+    _isFunctionTyped ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 5, false);
+    return _isFunctionTyped;
+  }
+
+  @override
+  bool get isInitializingFormal {
+    _isInitializingFormal ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 6, false);
+    return _isInitializingFormal;
+  }
+
+  @override
+  idl.UnlinkedParamKind get kind {
+    _kind ??= const _UnlinkedParamKindReader().vTableGet(_bc, _bcOffset, 4, idl.UnlinkedParamKind.required);
+    return _kind;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  int get nameOffset {
+    _nameOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _nameOffset;
+  }
+
+  @override
+  List<idl.UnlinkedParam> get parameters {
+    _parameters ??= const fb.ListReader<idl.UnlinkedParam>(const _UnlinkedParamReader()).vTableGet(_bc, _bcOffset, 8, const <idl.UnlinkedParam>[]);
+    return _parameters;
+  }
+
+  @override
+  idl.EntityRef get type {
+    _type ??= const _EntityRefReader().vTableGet(_bc, _bcOffset, 3, null);
+    return _type;
+  }
+
+  @override
+  int get visibleLength {
+    _visibleLength ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 10, 0);
+    return _visibleLength;
+  }
+
+  @override
+  int get visibleOffset {
+    _visibleOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 11, 0);
+    return _visibleOffset;
+  }
+}
+
+abstract class _UnlinkedParamMixin implements idl.UnlinkedParam {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (annotations.isNotEmpty) _result["annotations"] = annotations.map((_value) => _value.toJson()).toList();
+    if (codeRange != null) _result["codeRange"] = codeRange.toJson();
+    if (defaultValueCode != '') _result["defaultValueCode"] = defaultValueCode;
+    if (inferredTypeSlot != 0) _result["inferredTypeSlot"] = inferredTypeSlot;
+    if (inheritsCovariantSlot != 0) _result["inheritsCovariantSlot"] = inheritsCovariantSlot;
+    if (initializer != null) _result["initializer"] = initializer.toJson();
+    if (isFunctionTyped != false) _result["isFunctionTyped"] = isFunctionTyped;
+    if (isInitializingFormal != false) _result["isInitializingFormal"] = isInitializingFormal;
+    if (kind != idl.UnlinkedParamKind.required) _result["kind"] = kind.toString().split('.')[1];
+    if (name != '') _result["name"] = name;
+    if (nameOffset != 0) _result["nameOffset"] = nameOffset;
+    if (parameters.isNotEmpty) _result["parameters"] = parameters.map((_value) => _value.toJson()).toList();
+    if (type != null) _result["type"] = type.toJson();
+    if (visibleLength != 0) _result["visibleLength"] = visibleLength;
+    if (visibleOffset != 0) _result["visibleOffset"] = visibleOffset;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "annotations": annotations,
+    "codeRange": codeRange,
+    "defaultValueCode": defaultValueCode,
+    "inferredTypeSlot": inferredTypeSlot,
+    "inheritsCovariantSlot": inheritsCovariantSlot,
+    "initializer": initializer,
+    "isFunctionTyped": isFunctionTyped,
+    "isInitializingFormal": isInitializingFormal,
+    "kind": kind,
+    "name": name,
+    "nameOffset": nameOffset,
+    "parameters": parameters,
+    "type": type,
+    "visibleLength": visibleLength,
+    "visibleOffset": visibleOffset,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedPartBuilder extends Object with _UnlinkedPartMixin implements idl.UnlinkedPart {
+  List<UnlinkedConstBuilder> _annotations;
+  int _uriEnd;
+  int _uriOffset;
+
+  @override
+  List<UnlinkedConstBuilder> get annotations => _annotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for this part declaration.
+   */
+  void set annotations(List<UnlinkedConstBuilder> value) {
+    this._annotations = value;
+  }
+
+  @override
+  int get uriEnd => _uriEnd ??= 0;
+
+  /**
+   * End of the URI string (including quotes) relative to the beginning of the
+   * file.
+   */
+  void set uriEnd(int value) {
+    assert(value == null || value >= 0);
+    this._uriEnd = value;
+  }
+
+  @override
+  int get uriOffset => _uriOffset ??= 0;
+
+  /**
+   * Offset of the URI string (including quotes) relative to the beginning of
+   * the file.
+   */
+  void set uriOffset(int value) {
+    assert(value == null || value >= 0);
+    this._uriOffset = value;
+  }
+
+  UnlinkedPartBuilder({List<UnlinkedConstBuilder> annotations, int uriEnd, int uriOffset})
+    : _annotations = annotations,
+      _uriEnd = uriEnd,
+      _uriOffset = uriOffset;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _annotations?.forEach((b) => b.flushInformative());
+    _uriEnd = null;
+    _uriOffset = null;
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    if (this._annotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._annotations.length);
+      for (var x in this._annotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_annotations;
+    if (!(_annotations == null || _annotations.isEmpty)) {
+      offset_annotations = fbBuilder.writeList(_annotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_annotations != null) {
+      fbBuilder.addOffset(2, offset_annotations);
+    }
+    if (_uriEnd != null && _uriEnd != 0) {
+      fbBuilder.addUint32(0, _uriEnd);
+    }
+    if (_uriOffset != null && _uriOffset != 0) {
+      fbBuilder.addUint32(1, _uriOffset);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedPartReader extends fb.TableReader<_UnlinkedPartImpl> {
+  const _UnlinkedPartReader();
+
+  @override
+  _UnlinkedPartImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedPartImpl(bc, offset);
+}
+
+class _UnlinkedPartImpl extends Object with _UnlinkedPartMixin implements idl.UnlinkedPart {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedPartImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedConst> _annotations;
+  int _uriEnd;
+  int _uriOffset;
+
+  @override
+  List<idl.UnlinkedConst> get annotations {
+    _annotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 2, const <idl.UnlinkedConst>[]);
+    return _annotations;
+  }
+
+  @override
+  int get uriEnd {
+    _uriEnd ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 0, 0);
+    return _uriEnd;
+  }
+
+  @override
+  int get uriOffset {
+    _uriOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _uriOffset;
+  }
+}
+
+abstract class _UnlinkedPartMixin implements idl.UnlinkedPart {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (annotations.isNotEmpty) _result["annotations"] = annotations.map((_value) => _value.toJson()).toList();
+    if (uriEnd != 0) _result["uriEnd"] = uriEnd;
+    if (uriOffset != 0) _result["uriOffset"] = uriOffset;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "annotations": annotations,
+    "uriEnd": uriEnd,
+    "uriOffset": uriOffset,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedPublicNameBuilder extends Object with _UnlinkedPublicNameMixin implements idl.UnlinkedPublicName {
+  idl.ReferenceKind _kind;
+  List<UnlinkedPublicNameBuilder> _members;
+  String _name;
+  int _numTypeParameters;
+
+  @override
+  idl.ReferenceKind get kind => _kind ??= idl.ReferenceKind.classOrEnum;
+
+  /**
+   * The kind of object referred to by the name.
+   */
+  void set kind(idl.ReferenceKind value) {
+    this._kind = value;
+  }
+
+  @override
+  List<UnlinkedPublicNameBuilder> get members => _members ??= <UnlinkedPublicNameBuilder>[];
+
+  /**
+   * If this [UnlinkedPublicName] is a class, the list of members which can be
+   * referenced statically - static fields, static methods, and constructors.
+   * Otherwise empty.
+   *
+   * Unnamed constructors are not included since they do not constitute a
+   * separate name added to any namespace.
+   */
+  void set members(List<UnlinkedPublicNameBuilder> value) {
+    this._members = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * The name itself.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get numTypeParameters => _numTypeParameters ??= 0;
+
+  /**
+   * If the entity being referred to is generic, the number of type parameters
+   * it accepts.  Otherwise zero.
+   */
+  void set numTypeParameters(int value) {
+    assert(value == null || value >= 0);
+    this._numTypeParameters = value;
+  }
+
+  UnlinkedPublicNameBuilder({idl.ReferenceKind kind, List<UnlinkedPublicNameBuilder> members, String name, int numTypeParameters})
+    : _kind = kind,
+      _members = members,
+      _name = name,
+      _numTypeParameters = numTypeParameters;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _members?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    signature.addInt(this._kind == null ? 0 : this._kind.index);
+    if (this._members == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._members.length);
+      for (var x in this._members) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addInt(this._numTypeParameters ?? 0);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_members;
+    fb.Offset offset_name;
+    if (!(_members == null || _members.isEmpty)) {
+      offset_members = fbBuilder.writeList(_members.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    fbBuilder.startTable();
+    if (_kind != null && _kind != idl.ReferenceKind.classOrEnum) {
+      fbBuilder.addUint8(1, _kind.index);
+    }
+    if (offset_members != null) {
+      fbBuilder.addOffset(2, offset_members);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (_numTypeParameters != null && _numTypeParameters != 0) {
+      fbBuilder.addUint32(3, _numTypeParameters);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedPublicNameReader extends fb.TableReader<_UnlinkedPublicNameImpl> {
+  const _UnlinkedPublicNameReader();
+
+  @override
+  _UnlinkedPublicNameImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedPublicNameImpl(bc, offset);
+}
+
+class _UnlinkedPublicNameImpl extends Object with _UnlinkedPublicNameMixin implements idl.UnlinkedPublicName {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedPublicNameImpl(this._bc, this._bcOffset);
+
+  idl.ReferenceKind _kind;
+  List<idl.UnlinkedPublicName> _members;
+  String _name;
+  int _numTypeParameters;
+
+  @override
+  idl.ReferenceKind get kind {
+    _kind ??= const _ReferenceKindReader().vTableGet(_bc, _bcOffset, 1, idl.ReferenceKind.classOrEnum);
+    return _kind;
+  }
+
+  @override
+  List<idl.UnlinkedPublicName> get members {
+    _members ??= const fb.ListReader<idl.UnlinkedPublicName>(const _UnlinkedPublicNameReader()).vTableGet(_bc, _bcOffset, 2, const <idl.UnlinkedPublicName>[]);
+    return _members;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  int get numTypeParameters {
+    _numTypeParameters ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 3, 0);
+    return _numTypeParameters;
+  }
+}
+
+abstract class _UnlinkedPublicNameMixin implements idl.UnlinkedPublicName {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (kind != idl.ReferenceKind.classOrEnum) _result["kind"] = kind.toString().split('.')[1];
+    if (members.isNotEmpty) _result["members"] = members.map((_value) => _value.toJson()).toList();
+    if (name != '') _result["name"] = name;
+    if (numTypeParameters != 0) _result["numTypeParameters"] = numTypeParameters;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "kind": kind,
+    "members": members,
+    "name": name,
+    "numTypeParameters": numTypeParameters,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedPublicNamespaceBuilder extends Object with _UnlinkedPublicNamespaceMixin implements idl.UnlinkedPublicNamespace {
+  List<UnlinkedExportPublicBuilder> _exports;
+  List<UnlinkedPublicNameBuilder> _names;
+  List<String> _parts;
+
+  @override
+  List<UnlinkedExportPublicBuilder> get exports => _exports ??= <UnlinkedExportPublicBuilder>[];
+
+  /**
+   * Export declarations in the compilation unit.
+   */
+  void set exports(List<UnlinkedExportPublicBuilder> value) {
+    this._exports = value;
+  }
+
+  @override
+  List<UnlinkedPublicNameBuilder> get names => _names ??= <UnlinkedPublicNameBuilder>[];
+
+  /**
+   * Public names defined in the compilation unit.
+   *
+   * TODO(paulberry): consider sorting these names to reduce unnecessary
+   * relinking.
+   */
+  void set names(List<UnlinkedPublicNameBuilder> value) {
+    this._names = value;
+  }
+
+  @override
+  List<String> get parts => _parts ??= <String>[];
+
+  /**
+   * URIs referenced by part declarations in the compilation unit.
+   */
+  void set parts(List<String> value) {
+    this._parts = value;
+  }
+
+  UnlinkedPublicNamespaceBuilder({List<UnlinkedExportPublicBuilder> exports, List<UnlinkedPublicNameBuilder> names, List<String> parts})
+    : _exports = exports,
+      _names = names,
+      _parts = parts;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _exports?.forEach((b) => b.flushInformative());
+    _names?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    if (this._names == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._names.length);
+      for (var x in this._names) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._parts == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._parts.length);
+      for (var x in this._parts) {
+        signature.addString(x);
+      }
+    }
+    if (this._exports == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._exports.length);
+      for (var x in this._exports) {
+        x?.collectApiSignature(signature);
+      }
+    }
+  }
+
+  List<int> toBuffer() {
+    fb.Builder fbBuilder = new fb.Builder();
+    return fbBuilder.finish(finish(fbBuilder), "UPNS");
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_exports;
+    fb.Offset offset_names;
+    fb.Offset offset_parts;
+    if (!(_exports == null || _exports.isEmpty)) {
+      offset_exports = fbBuilder.writeList(_exports.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_names == null || _names.isEmpty)) {
+      offset_names = fbBuilder.writeList(_names.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_parts == null || _parts.isEmpty)) {
+      offset_parts = fbBuilder.writeList(_parts.map((b) => fbBuilder.writeString(b)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_exports != null) {
+      fbBuilder.addOffset(2, offset_exports);
+    }
+    if (offset_names != null) {
+      fbBuilder.addOffset(0, offset_names);
+    }
+    if (offset_parts != null) {
+      fbBuilder.addOffset(1, offset_parts);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+idl.UnlinkedPublicNamespace readUnlinkedPublicNamespace(List<int> buffer) {
+  fb.BufferContext rootRef = new fb.BufferContext.fromBytes(buffer);
+  return const _UnlinkedPublicNamespaceReader().read(rootRef, 0);
+}
+
+class _UnlinkedPublicNamespaceReader extends fb.TableReader<_UnlinkedPublicNamespaceImpl> {
+  const _UnlinkedPublicNamespaceReader();
+
+  @override
+  _UnlinkedPublicNamespaceImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedPublicNamespaceImpl(bc, offset);
+}
+
+class _UnlinkedPublicNamespaceImpl extends Object with _UnlinkedPublicNamespaceMixin implements idl.UnlinkedPublicNamespace {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedPublicNamespaceImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedExportPublic> _exports;
+  List<idl.UnlinkedPublicName> _names;
+  List<String> _parts;
+
+  @override
+  List<idl.UnlinkedExportPublic> get exports {
+    _exports ??= const fb.ListReader<idl.UnlinkedExportPublic>(const _UnlinkedExportPublicReader()).vTableGet(_bc, _bcOffset, 2, const <idl.UnlinkedExportPublic>[]);
+    return _exports;
+  }
+
+  @override
+  List<idl.UnlinkedPublicName> get names {
+    _names ??= const fb.ListReader<idl.UnlinkedPublicName>(const _UnlinkedPublicNameReader()).vTableGet(_bc, _bcOffset, 0, const <idl.UnlinkedPublicName>[]);
+    return _names;
+  }
+
+  @override
+  List<String> get parts {
+    _parts ??= const fb.ListReader<String>(const fb.StringReader()).vTableGet(_bc, _bcOffset, 1, const <String>[]);
+    return _parts;
+  }
+}
+
+abstract class _UnlinkedPublicNamespaceMixin implements idl.UnlinkedPublicNamespace {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (exports.isNotEmpty) _result["exports"] = exports.map((_value) => _value.toJson()).toList();
+    if (names.isNotEmpty) _result["names"] = names.map((_value) => _value.toJson()).toList();
+    if (parts.isNotEmpty) _result["parts"] = parts;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "exports": exports,
+    "names": names,
+    "parts": parts,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedReferenceBuilder extends Object with _UnlinkedReferenceMixin implements idl.UnlinkedReference {
+  String _name;
+  int _prefixReference;
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the entity being referred to.  For the pseudo-type `dynamic`, the
+   * string is "dynamic".  For the pseudo-type `void`, the string is "void".
+   * For the pseudo-type `bottom`, the string is "*bottom*".
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get prefixReference => _prefixReference ??= 0;
+
+  /**
+   * Prefix used to refer to the entity, or zero if no prefix is used.  This is
+   * an index into [UnlinkedUnit.references].
+   *
+   * Prefix references must always point backward; that is, for all i, if
+   * UnlinkedUnit.references[i].prefixReference != 0, then
+   * UnlinkedUnit.references[i].prefixReference < i.
+   */
+  void set prefixReference(int value) {
+    assert(value == null || value >= 0);
+    this._prefixReference = value;
+  }
+
+  UnlinkedReferenceBuilder({String name, int prefixReference})
+    : _name = name,
+      _prefixReference = prefixReference;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    signature.addInt(this._prefixReference ?? 0);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_name;
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    fbBuilder.startTable();
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (_prefixReference != null && _prefixReference != 0) {
+      fbBuilder.addUint32(1, _prefixReference);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedReferenceReader extends fb.TableReader<_UnlinkedReferenceImpl> {
+  const _UnlinkedReferenceReader();
+
+  @override
+  _UnlinkedReferenceImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedReferenceImpl(bc, offset);
+}
+
+class _UnlinkedReferenceImpl extends Object with _UnlinkedReferenceMixin implements idl.UnlinkedReference {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedReferenceImpl(this._bc, this._bcOffset);
+
+  String _name;
+  int _prefixReference;
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  int get prefixReference {
+    _prefixReference ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _prefixReference;
+  }
+}
+
+abstract class _UnlinkedReferenceMixin implements idl.UnlinkedReference {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (name != '') _result["name"] = name;
+    if (prefixReference != 0) _result["prefixReference"] = prefixReference;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "name": name,
+    "prefixReference": prefixReference,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedTypedefBuilder extends Object with _UnlinkedTypedefMixin implements idl.UnlinkedTypedef {
+  List<UnlinkedConstBuilder> _annotations;
+  CodeRangeBuilder _codeRange;
+  UnlinkedDocumentationCommentBuilder _documentationComment;
+  String _name;
+  int _nameOffset;
+  List<UnlinkedParamBuilder> _parameters;
+  EntityRefBuilder _returnType;
+  List<UnlinkedTypeParamBuilder> _typeParameters;
+
+  @override
+  List<UnlinkedConstBuilder> get annotations => _annotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for this typedef.
+   */
+  void set annotations(List<UnlinkedConstBuilder> value) {
+    this._annotations = value;
+  }
+
+  @override
+  CodeRangeBuilder get codeRange => _codeRange;
+
+  /**
+   * Code range of the typedef.
+   */
+  void set codeRange(CodeRangeBuilder value) {
+    this._codeRange = value;
+  }
+
+  @override
+  UnlinkedDocumentationCommentBuilder get documentationComment => _documentationComment;
+
+  /**
+   * Documentation comment for the typedef, or `null` if there is no
+   * documentation comment.
+   */
+  void set documentationComment(UnlinkedDocumentationCommentBuilder value) {
+    this._documentationComment = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the typedef.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get nameOffset => _nameOffset ??= 0;
+
+  /**
+   * Offset of the typedef name relative to the beginning of the file.
+   */
+  void set nameOffset(int value) {
+    assert(value == null || value >= 0);
+    this._nameOffset = value;
+  }
+
+  @override
+  List<UnlinkedParamBuilder> get parameters => _parameters ??= <UnlinkedParamBuilder>[];
+
+  /**
+   * Parameters of the executable, if any.
+   */
+  void set parameters(List<UnlinkedParamBuilder> value) {
+    this._parameters = value;
+  }
+
+  @override
+  EntityRefBuilder get returnType => _returnType;
+
+  /**
+   * Return type of the typedef.
+   */
+  void set returnType(EntityRefBuilder value) {
+    this._returnType = value;
+  }
+
+  @override
+  List<UnlinkedTypeParamBuilder> get typeParameters => _typeParameters ??= <UnlinkedTypeParamBuilder>[];
+
+  /**
+   * Type parameters of the typedef, if any.
+   */
+  void set typeParameters(List<UnlinkedTypeParamBuilder> value) {
+    this._typeParameters = value;
+  }
+
+  UnlinkedTypedefBuilder({List<UnlinkedConstBuilder> annotations, CodeRangeBuilder codeRange, UnlinkedDocumentationCommentBuilder documentationComment, String name, int nameOffset, List<UnlinkedParamBuilder> parameters, EntityRefBuilder returnType, List<UnlinkedTypeParamBuilder> typeParameters})
+    : _annotations = annotations,
+      _codeRange = codeRange,
+      _documentationComment = documentationComment,
+      _name = name,
+      _nameOffset = nameOffset,
+      _parameters = parameters,
+      _returnType = returnType,
+      _typeParameters = typeParameters;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _annotations?.forEach((b) => b.flushInformative());
+    _codeRange = null;
+    _documentationComment = null;
+    _nameOffset = null;
+    _parameters?.forEach((b) => b.flushInformative());
+    _returnType?.flushInformative();
+    _typeParameters?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    signature.addBool(this._returnType != null);
+    this._returnType?.collectApiSignature(signature);
+    if (this._parameters == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._parameters.length);
+      for (var x in this._parameters) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._annotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._annotations.length);
+      for (var x in this._annotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._typeParameters == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._typeParameters.length);
+      for (var x in this._typeParameters) {
+        x?.collectApiSignature(signature);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_annotations;
+    fb.Offset offset_codeRange;
+    fb.Offset offset_documentationComment;
+    fb.Offset offset_name;
+    fb.Offset offset_parameters;
+    fb.Offset offset_returnType;
+    fb.Offset offset_typeParameters;
+    if (!(_annotations == null || _annotations.isEmpty)) {
+      offset_annotations = fbBuilder.writeList(_annotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_codeRange != null) {
+      offset_codeRange = _codeRange.finish(fbBuilder);
+    }
+    if (_documentationComment != null) {
+      offset_documentationComment = _documentationComment.finish(fbBuilder);
+    }
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    if (!(_parameters == null || _parameters.isEmpty)) {
+      offset_parameters = fbBuilder.writeList(_parameters.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_returnType != null) {
+      offset_returnType = _returnType.finish(fbBuilder);
+    }
+    if (!(_typeParameters == null || _typeParameters.isEmpty)) {
+      offset_typeParameters = fbBuilder.writeList(_typeParameters.map((b) => b.finish(fbBuilder)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_annotations != null) {
+      fbBuilder.addOffset(4, offset_annotations);
+    }
+    if (offset_codeRange != null) {
+      fbBuilder.addOffset(7, offset_codeRange);
+    }
+    if (offset_documentationComment != null) {
+      fbBuilder.addOffset(6, offset_documentationComment);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (_nameOffset != null && _nameOffset != 0) {
+      fbBuilder.addUint32(1, _nameOffset);
+    }
+    if (offset_parameters != null) {
+      fbBuilder.addOffset(3, offset_parameters);
+    }
+    if (offset_returnType != null) {
+      fbBuilder.addOffset(2, offset_returnType);
+    }
+    if (offset_typeParameters != null) {
+      fbBuilder.addOffset(5, offset_typeParameters);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedTypedefReader extends fb.TableReader<_UnlinkedTypedefImpl> {
+  const _UnlinkedTypedefReader();
+
+  @override
+  _UnlinkedTypedefImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedTypedefImpl(bc, offset);
+}
+
+class _UnlinkedTypedefImpl extends Object with _UnlinkedTypedefMixin implements idl.UnlinkedTypedef {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedTypedefImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedConst> _annotations;
+  idl.CodeRange _codeRange;
+  idl.UnlinkedDocumentationComment _documentationComment;
+  String _name;
+  int _nameOffset;
+  List<idl.UnlinkedParam> _parameters;
+  idl.EntityRef _returnType;
+  List<idl.UnlinkedTypeParam> _typeParameters;
+
+  @override
+  List<idl.UnlinkedConst> get annotations {
+    _annotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 4, const <idl.UnlinkedConst>[]);
+    return _annotations;
+  }
+
+  @override
+  idl.CodeRange get codeRange {
+    _codeRange ??= const _CodeRangeReader().vTableGet(_bc, _bcOffset, 7, null);
+    return _codeRange;
+  }
+
+  @override
+  idl.UnlinkedDocumentationComment get documentationComment {
+    _documentationComment ??= const _UnlinkedDocumentationCommentReader().vTableGet(_bc, _bcOffset, 6, null);
+    return _documentationComment;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  int get nameOffset {
+    _nameOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _nameOffset;
+  }
+
+  @override
+  List<idl.UnlinkedParam> get parameters {
+    _parameters ??= const fb.ListReader<idl.UnlinkedParam>(const _UnlinkedParamReader()).vTableGet(_bc, _bcOffset, 3, const <idl.UnlinkedParam>[]);
+    return _parameters;
+  }
+
+  @override
+  idl.EntityRef get returnType {
+    _returnType ??= const _EntityRefReader().vTableGet(_bc, _bcOffset, 2, null);
+    return _returnType;
+  }
+
+  @override
+  List<idl.UnlinkedTypeParam> get typeParameters {
+    _typeParameters ??= const fb.ListReader<idl.UnlinkedTypeParam>(const _UnlinkedTypeParamReader()).vTableGet(_bc, _bcOffset, 5, const <idl.UnlinkedTypeParam>[]);
+    return _typeParameters;
+  }
+}
+
+abstract class _UnlinkedTypedefMixin implements idl.UnlinkedTypedef {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (annotations.isNotEmpty) _result["annotations"] = annotations.map((_value) => _value.toJson()).toList();
+    if (codeRange != null) _result["codeRange"] = codeRange.toJson();
+    if (documentationComment != null) _result["documentationComment"] = documentationComment.toJson();
+    if (name != '') _result["name"] = name;
+    if (nameOffset != 0) _result["nameOffset"] = nameOffset;
+    if (parameters.isNotEmpty) _result["parameters"] = parameters.map((_value) => _value.toJson()).toList();
+    if (returnType != null) _result["returnType"] = returnType.toJson();
+    if (typeParameters.isNotEmpty) _result["typeParameters"] = typeParameters.map((_value) => _value.toJson()).toList();
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "annotations": annotations,
+    "codeRange": codeRange,
+    "documentationComment": documentationComment,
+    "name": name,
+    "nameOffset": nameOffset,
+    "parameters": parameters,
+    "returnType": returnType,
+    "typeParameters": typeParameters,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedTypeParamBuilder extends Object with _UnlinkedTypeParamMixin implements idl.UnlinkedTypeParam {
+  List<UnlinkedConstBuilder> _annotations;
+  EntityRefBuilder _bound;
+  CodeRangeBuilder _codeRange;
+  String _name;
+  int _nameOffset;
+
+  @override
+  List<UnlinkedConstBuilder> get annotations => _annotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for this type parameter.
+   */
+  void set annotations(List<UnlinkedConstBuilder> value) {
+    this._annotations = value;
+  }
+
+  @override
+  EntityRefBuilder get bound => _bound;
+
+  /**
+   * Bound of the type parameter, if a bound is explicitly declared.  Otherwise
+   * null.
+   */
+  void set bound(EntityRefBuilder value) {
+    this._bound = value;
+  }
+
+  @override
+  CodeRangeBuilder get codeRange => _codeRange;
+
+  /**
+   * Code range of the type parameter.
+   */
+  void set codeRange(CodeRangeBuilder value) {
+    this._codeRange = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the type parameter.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get nameOffset => _nameOffset ??= 0;
+
+  /**
+   * Offset of the type parameter name relative to the beginning of the file.
+   */
+  void set nameOffset(int value) {
+    assert(value == null || value >= 0);
+    this._nameOffset = value;
+  }
+
+  UnlinkedTypeParamBuilder({List<UnlinkedConstBuilder> annotations, EntityRefBuilder bound, CodeRangeBuilder codeRange, String name, int nameOffset})
+    : _annotations = annotations,
+      _bound = bound,
+      _codeRange = codeRange,
+      _name = name,
+      _nameOffset = nameOffset;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _annotations?.forEach((b) => b.flushInformative());
+    _bound?.flushInformative();
+    _codeRange = null;
+    _nameOffset = null;
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    signature.addBool(this._bound != null);
+    this._bound?.collectApiSignature(signature);
+    if (this._annotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._annotations.length);
+      for (var x in this._annotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_annotations;
+    fb.Offset offset_bound;
+    fb.Offset offset_codeRange;
+    fb.Offset offset_name;
+    if (!(_annotations == null || _annotations.isEmpty)) {
+      offset_annotations = fbBuilder.writeList(_annotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_bound != null) {
+      offset_bound = _bound.finish(fbBuilder);
+    }
+    if (_codeRange != null) {
+      offset_codeRange = _codeRange.finish(fbBuilder);
+    }
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    fbBuilder.startTable();
+    if (offset_annotations != null) {
+      fbBuilder.addOffset(3, offset_annotations);
+    }
+    if (offset_bound != null) {
+      fbBuilder.addOffset(2, offset_bound);
+    }
+    if (offset_codeRange != null) {
+      fbBuilder.addOffset(4, offset_codeRange);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (_nameOffset != null && _nameOffset != 0) {
+      fbBuilder.addUint32(1, _nameOffset);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedTypeParamReader extends fb.TableReader<_UnlinkedTypeParamImpl> {
+  const _UnlinkedTypeParamReader();
+
+  @override
+  _UnlinkedTypeParamImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedTypeParamImpl(bc, offset);
+}
+
+class _UnlinkedTypeParamImpl extends Object with _UnlinkedTypeParamMixin implements idl.UnlinkedTypeParam {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedTypeParamImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedConst> _annotations;
+  idl.EntityRef _bound;
+  idl.CodeRange _codeRange;
+  String _name;
+  int _nameOffset;
+
+  @override
+  List<idl.UnlinkedConst> get annotations {
+    _annotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 3, const <idl.UnlinkedConst>[]);
+    return _annotations;
+  }
+
+  @override
+  idl.EntityRef get bound {
+    _bound ??= const _EntityRefReader().vTableGet(_bc, _bcOffset, 2, null);
+    return _bound;
+  }
+
+  @override
+  idl.CodeRange get codeRange {
+    _codeRange ??= const _CodeRangeReader().vTableGet(_bc, _bcOffset, 4, null);
+    return _codeRange;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  int get nameOffset {
+    _nameOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _nameOffset;
+  }
+}
+
+abstract class _UnlinkedTypeParamMixin implements idl.UnlinkedTypeParam {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (annotations.isNotEmpty) _result["annotations"] = annotations.map((_value) => _value.toJson()).toList();
+    if (bound != null) _result["bound"] = bound.toJson();
+    if (codeRange != null) _result["codeRange"] = codeRange.toJson();
+    if (name != '') _result["name"] = name;
+    if (nameOffset != 0) _result["nameOffset"] = nameOffset;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "annotations": annotations,
+    "bound": bound,
+    "codeRange": codeRange,
+    "name": name,
+    "nameOffset": nameOffset,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedUnitBuilder extends Object with _UnlinkedUnitMixin implements idl.UnlinkedUnit {
+  List<UnlinkedClassBuilder> _classes;
+  CodeRangeBuilder _codeRange;
+  List<UnlinkedEnumBuilder> _enums;
+  List<UnlinkedExecutableBuilder> _executables;
+  List<UnlinkedExportNonPublicBuilder> _exports;
+  String _fallbackModePath;
+  List<UnlinkedImportBuilder> _imports;
+  List<UnlinkedConstBuilder> _libraryAnnotations;
+  UnlinkedDocumentationCommentBuilder _libraryDocumentationComment;
+  String _libraryName;
+  int _libraryNameLength;
+  int _libraryNameOffset;
+  List<int> _lineStarts;
+  List<UnlinkedPartBuilder> _parts;
+  UnlinkedPublicNamespaceBuilder _publicNamespace;
+  List<UnlinkedReferenceBuilder> _references;
+  List<UnlinkedTypedefBuilder> _typedefs;
+  List<UnlinkedVariableBuilder> _variables;
+
+  @override
+  List<UnlinkedClassBuilder> get classes => _classes ??= <UnlinkedClassBuilder>[];
+
+  /**
+   * Classes declared in the compilation unit.
+   */
+  void set classes(List<UnlinkedClassBuilder> value) {
+    this._classes = value;
+  }
+
+  @override
+  CodeRangeBuilder get codeRange => _codeRange;
+
+  /**
+   * Code range of the unit.
+   */
+  void set codeRange(CodeRangeBuilder value) {
+    this._codeRange = value;
+  }
+
+  @override
+  List<UnlinkedEnumBuilder> get enums => _enums ??= <UnlinkedEnumBuilder>[];
+
+  /**
+   * Enums declared in the compilation unit.
+   */
+  void set enums(List<UnlinkedEnumBuilder> value) {
+    this._enums = value;
+  }
+
+  @override
+  List<UnlinkedExecutableBuilder> get executables => _executables ??= <UnlinkedExecutableBuilder>[];
+
+  /**
+   * Top level executable objects (functions, getters, and setters) declared in
+   * the compilation unit.
+   */
+  void set executables(List<UnlinkedExecutableBuilder> value) {
+    this._executables = value;
+  }
+
+  @override
+  List<UnlinkedExportNonPublicBuilder> get exports => _exports ??= <UnlinkedExportNonPublicBuilder>[];
+
+  /**
+   * Export declarations in the compilation unit.
+   */
+  void set exports(List<UnlinkedExportNonPublicBuilder> value) {
+    this._exports = value;
+  }
+
+  @override
+  String get fallbackModePath => _fallbackModePath ??= '';
+
+  /**
+   * If this compilation unit was summarized in fallback mode, the path where
+   * the compilation unit may be found on disk.  Otherwise empty.
+   *
+   * When this field is non-empty, all other fields in the data structure have
+   * their default values.
+   */
+  void set fallbackModePath(String value) {
+    this._fallbackModePath = value;
+  }
+
+  @override
+  List<UnlinkedImportBuilder> get imports => _imports ??= <UnlinkedImportBuilder>[];
+
+  /**
+   * Import declarations in the compilation unit.
+   */
+  void set imports(List<UnlinkedImportBuilder> value) {
+    this._imports = value;
+  }
+
+  @override
+  List<UnlinkedConstBuilder> get libraryAnnotations => _libraryAnnotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for the library declaration, or the empty list if there is no
+   * library declaration.
+   */
+  void set libraryAnnotations(List<UnlinkedConstBuilder> value) {
+    this._libraryAnnotations = value;
+  }
+
+  @override
+  UnlinkedDocumentationCommentBuilder get libraryDocumentationComment => _libraryDocumentationComment;
+
+  /**
+   * Documentation comment for the library, or `null` if there is no
+   * documentation comment.
+   */
+  void set libraryDocumentationComment(UnlinkedDocumentationCommentBuilder value) {
+    this._libraryDocumentationComment = value;
+  }
+
+  @override
+  String get libraryName => _libraryName ??= '';
+
+  /**
+   * Name of the library (from a "library" declaration, if present).
+   */
+  void set libraryName(String value) {
+    this._libraryName = value;
+  }
+
+  @override
+  int get libraryNameLength => _libraryNameLength ??= 0;
+
+  /**
+   * Length of the library name as it appears in the source code (or 0 if the
+   * library has no name).
+   */
+  void set libraryNameLength(int value) {
+    assert(value == null || value >= 0);
+    this._libraryNameLength = value;
+  }
+
+  @override
+  int get libraryNameOffset => _libraryNameOffset ??= 0;
+
+  /**
+   * Offset of the library name relative to the beginning of the file (or 0 if
+   * the library has no name).
+   */
+  void set libraryNameOffset(int value) {
+    assert(value == null || value >= 0);
+    this._libraryNameOffset = value;
+  }
+
+  @override
+  List<int> get lineStarts => _lineStarts ??= <int>[];
+
+  /**
+   * Offsets of the first character of each line in the source code.
+   */
+  void set lineStarts(List<int> value) {
+    assert(value == null || value.every((e) => e >= 0));
+    this._lineStarts = value;
+  }
+
+  @override
+  List<UnlinkedPartBuilder> get parts => _parts ??= <UnlinkedPartBuilder>[];
+
+  /**
+   * Part declarations in the compilation unit.
+   */
+  void set parts(List<UnlinkedPartBuilder> value) {
+    this._parts = value;
+  }
+
+  @override
+  UnlinkedPublicNamespaceBuilder get publicNamespace => _publicNamespace;
+
+  /**
+   * Unlinked public namespace of this compilation unit.
+   */
+  void set publicNamespace(UnlinkedPublicNamespaceBuilder value) {
+    this._publicNamespace = value;
+  }
+
+  @override
+  List<UnlinkedReferenceBuilder> get references => _references ??= <UnlinkedReferenceBuilder>[];
+
+  /**
+   * Top level and prefixed names referred to by this compilation unit.  The
+   * zeroth element of this array is always populated and is used to represent
+   * the absence of a reference in places where a reference is optional (for
+   * example [UnlinkedReference.prefixReference or
+   * UnlinkedImport.prefixReference]).
+   */
+  void set references(List<UnlinkedReferenceBuilder> value) {
+    this._references = value;
+  }
+
+  @override
+  List<UnlinkedTypedefBuilder> get typedefs => _typedefs ??= <UnlinkedTypedefBuilder>[];
+
+  /**
+   * Typedefs declared in the compilation unit.
+   */
+  void set typedefs(List<UnlinkedTypedefBuilder> value) {
+    this._typedefs = value;
+  }
+
+  @override
+  List<UnlinkedVariableBuilder> get variables => _variables ??= <UnlinkedVariableBuilder>[];
+
+  /**
+   * Top level variables declared in the compilation unit.
+   */
+  void set variables(List<UnlinkedVariableBuilder> value) {
+    this._variables = value;
+  }
+
+  UnlinkedUnitBuilder({List<UnlinkedClassBuilder> classes, CodeRangeBuilder codeRange, List<UnlinkedEnumBuilder> enums, List<UnlinkedExecutableBuilder> executables, List<UnlinkedExportNonPublicBuilder> exports, String fallbackModePath, List<UnlinkedImportBuilder> imports, List<UnlinkedConstBuilder> libraryAnnotations, UnlinkedDocumentationCommentBuilder libraryDocumentationComment, String libraryName, int libraryNameLength, int libraryNameOffset, List<int> lineStarts, List<UnlinkedPartBuilder> parts, UnlinkedPublicNamespaceBuilder publicNamespace, List<UnlinkedReferenceBuilder> references, List<UnlinkedTypedefBuilder> typedefs, List<UnlinkedVariableBuilder> variables})
+    : _classes = classes,
+      _codeRange = codeRange,
+      _enums = enums,
+      _executables = executables,
+      _exports = exports,
+      _fallbackModePath = fallbackModePath,
+      _imports = imports,
+      _libraryAnnotations = libraryAnnotations,
+      _libraryDocumentationComment = libraryDocumentationComment,
+      _libraryName = libraryName,
+      _libraryNameLength = libraryNameLength,
+      _libraryNameOffset = libraryNameOffset,
+      _lineStarts = lineStarts,
+      _parts = parts,
+      _publicNamespace = publicNamespace,
+      _references = references,
+      _typedefs = typedefs,
+      _variables = variables;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _classes?.forEach((b) => b.flushInformative());
+    _codeRange = null;
+    _enums?.forEach((b) => b.flushInformative());
+    _executables?.forEach((b) => b.flushInformative());
+    _exports?.forEach((b) => b.flushInformative());
+    _imports?.forEach((b) => b.flushInformative());
+    _libraryAnnotations?.forEach((b) => b.flushInformative());
+    _libraryDocumentationComment = null;
+    _libraryNameLength = null;
+    _libraryNameOffset = null;
+    _lineStarts = null;
+    _parts?.forEach((b) => b.flushInformative());
+    _publicNamespace?.flushInformative();
+    _references?.forEach((b) => b.flushInformative());
+    _typedefs?.forEach((b) => b.flushInformative());
+    _variables?.forEach((b) => b.flushInformative());
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addBool(this._publicNamespace != null);
+    this._publicNamespace?.collectApiSignature(signature);
+    if (this._references == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._references.length);
+      for (var x in this._references) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._classes == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._classes.length);
+      for (var x in this._classes) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._variables == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._variables.length);
+      for (var x in this._variables) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._executables == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._executables.length);
+      for (var x in this._executables) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._imports == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._imports.length);
+      for (var x in this._imports) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addString(this._libraryName ?? '');
+    if (this._typedefs == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._typedefs.length);
+      for (var x in this._typedefs) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._parts == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._parts.length);
+      for (var x in this._parts) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._enums == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._enums.length);
+      for (var x in this._enums) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._exports == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._exports.length);
+      for (var x in this._exports) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    if (this._libraryAnnotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._libraryAnnotations.length);
+      for (var x in this._libraryAnnotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addString(this._fallbackModePath ?? '');
+  }
+
+  List<int> toBuffer() {
+    fb.Builder fbBuilder = new fb.Builder();
+    return fbBuilder.finish(finish(fbBuilder), "UUnt");
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_classes;
+    fb.Offset offset_codeRange;
+    fb.Offset offset_enums;
+    fb.Offset offset_executables;
+    fb.Offset offset_exports;
+    fb.Offset offset_fallbackModePath;
+    fb.Offset offset_imports;
+    fb.Offset offset_libraryAnnotations;
+    fb.Offset offset_libraryDocumentationComment;
+    fb.Offset offset_libraryName;
+    fb.Offset offset_lineStarts;
+    fb.Offset offset_parts;
+    fb.Offset offset_publicNamespace;
+    fb.Offset offset_references;
+    fb.Offset offset_typedefs;
+    fb.Offset offset_variables;
+    if (!(_classes == null || _classes.isEmpty)) {
+      offset_classes = fbBuilder.writeList(_classes.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_codeRange != null) {
+      offset_codeRange = _codeRange.finish(fbBuilder);
+    }
+    if (!(_enums == null || _enums.isEmpty)) {
+      offset_enums = fbBuilder.writeList(_enums.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_executables == null || _executables.isEmpty)) {
+      offset_executables = fbBuilder.writeList(_executables.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_exports == null || _exports.isEmpty)) {
+      offset_exports = fbBuilder.writeList(_exports.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_fallbackModePath != null) {
+      offset_fallbackModePath = fbBuilder.writeString(_fallbackModePath);
+    }
+    if (!(_imports == null || _imports.isEmpty)) {
+      offset_imports = fbBuilder.writeList(_imports.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_libraryAnnotations == null || _libraryAnnotations.isEmpty)) {
+      offset_libraryAnnotations = fbBuilder.writeList(_libraryAnnotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_libraryDocumentationComment != null) {
+      offset_libraryDocumentationComment = _libraryDocumentationComment.finish(fbBuilder);
+    }
+    if (_libraryName != null) {
+      offset_libraryName = fbBuilder.writeString(_libraryName);
+    }
+    if (!(_lineStarts == null || _lineStarts.isEmpty)) {
+      offset_lineStarts = fbBuilder.writeListUint32(_lineStarts);
+    }
+    if (!(_parts == null || _parts.isEmpty)) {
+      offset_parts = fbBuilder.writeList(_parts.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_publicNamespace != null) {
+      offset_publicNamespace = _publicNamespace.finish(fbBuilder);
+    }
+    if (!(_references == null || _references.isEmpty)) {
+      offset_references = fbBuilder.writeList(_references.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_typedefs == null || _typedefs.isEmpty)) {
+      offset_typedefs = fbBuilder.writeList(_typedefs.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (!(_variables == null || _variables.isEmpty)) {
+      offset_variables = fbBuilder.writeList(_variables.map((b) => b.finish(fbBuilder)).toList());
+    }
+    fbBuilder.startTable();
+    if (offset_classes != null) {
+      fbBuilder.addOffset(2, offset_classes);
+    }
+    if (offset_codeRange != null) {
+      fbBuilder.addOffset(15, offset_codeRange);
+    }
+    if (offset_enums != null) {
+      fbBuilder.addOffset(12, offset_enums);
+    }
+    if (offset_executables != null) {
+      fbBuilder.addOffset(4, offset_executables);
+    }
+    if (offset_exports != null) {
+      fbBuilder.addOffset(13, offset_exports);
+    }
+    if (offset_fallbackModePath != null) {
+      fbBuilder.addOffset(16, offset_fallbackModePath);
+    }
+    if (offset_imports != null) {
+      fbBuilder.addOffset(5, offset_imports);
+    }
+    if (offset_libraryAnnotations != null) {
+      fbBuilder.addOffset(14, offset_libraryAnnotations);
+    }
+    if (offset_libraryDocumentationComment != null) {
+      fbBuilder.addOffset(9, offset_libraryDocumentationComment);
+    }
+    if (offset_libraryName != null) {
+      fbBuilder.addOffset(6, offset_libraryName);
+    }
+    if (_libraryNameLength != null && _libraryNameLength != 0) {
+      fbBuilder.addUint32(7, _libraryNameLength);
+    }
+    if (_libraryNameOffset != null && _libraryNameOffset != 0) {
+      fbBuilder.addUint32(8, _libraryNameOffset);
+    }
+    if (offset_lineStarts != null) {
+      fbBuilder.addOffset(17, offset_lineStarts);
+    }
+    if (offset_parts != null) {
+      fbBuilder.addOffset(11, offset_parts);
+    }
+    if (offset_publicNamespace != null) {
+      fbBuilder.addOffset(0, offset_publicNamespace);
+    }
+    if (offset_references != null) {
+      fbBuilder.addOffset(1, offset_references);
+    }
+    if (offset_typedefs != null) {
+      fbBuilder.addOffset(10, offset_typedefs);
+    }
+    if (offset_variables != null) {
+      fbBuilder.addOffset(3, offset_variables);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+idl.UnlinkedUnit readUnlinkedUnit(List<int> buffer) {
+  fb.BufferContext rootRef = new fb.BufferContext.fromBytes(buffer);
+  return const _UnlinkedUnitReader().read(rootRef, 0);
+}
+
+class _UnlinkedUnitReader extends fb.TableReader<_UnlinkedUnitImpl> {
+  const _UnlinkedUnitReader();
+
+  @override
+  _UnlinkedUnitImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedUnitImpl(bc, offset);
+}
+
+class _UnlinkedUnitImpl extends Object with _UnlinkedUnitMixin implements idl.UnlinkedUnit {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedUnitImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedClass> _classes;
+  idl.CodeRange _codeRange;
+  List<idl.UnlinkedEnum> _enums;
+  List<idl.UnlinkedExecutable> _executables;
+  List<idl.UnlinkedExportNonPublic> _exports;
+  String _fallbackModePath;
+  List<idl.UnlinkedImport> _imports;
+  List<idl.UnlinkedConst> _libraryAnnotations;
+  idl.UnlinkedDocumentationComment _libraryDocumentationComment;
+  String _libraryName;
+  int _libraryNameLength;
+  int _libraryNameOffset;
+  List<int> _lineStarts;
+  List<idl.UnlinkedPart> _parts;
+  idl.UnlinkedPublicNamespace _publicNamespace;
+  List<idl.UnlinkedReference> _references;
+  List<idl.UnlinkedTypedef> _typedefs;
+  List<idl.UnlinkedVariable> _variables;
+
+  @override
+  List<idl.UnlinkedClass> get classes {
+    _classes ??= const fb.ListReader<idl.UnlinkedClass>(const _UnlinkedClassReader()).vTableGet(_bc, _bcOffset, 2, const <idl.UnlinkedClass>[]);
+    return _classes;
+  }
+
+  @override
+  idl.CodeRange get codeRange {
+    _codeRange ??= const _CodeRangeReader().vTableGet(_bc, _bcOffset, 15, null);
+    return _codeRange;
+  }
+
+  @override
+  List<idl.UnlinkedEnum> get enums {
+    _enums ??= const fb.ListReader<idl.UnlinkedEnum>(const _UnlinkedEnumReader()).vTableGet(_bc, _bcOffset, 12, const <idl.UnlinkedEnum>[]);
+    return _enums;
+  }
+
+  @override
+  List<idl.UnlinkedExecutable> get executables {
+    _executables ??= const fb.ListReader<idl.UnlinkedExecutable>(const _UnlinkedExecutableReader()).vTableGet(_bc, _bcOffset, 4, const <idl.UnlinkedExecutable>[]);
+    return _executables;
+  }
+
+  @override
+  List<idl.UnlinkedExportNonPublic> get exports {
+    _exports ??= const fb.ListReader<idl.UnlinkedExportNonPublic>(const _UnlinkedExportNonPublicReader()).vTableGet(_bc, _bcOffset, 13, const <idl.UnlinkedExportNonPublic>[]);
+    return _exports;
+  }
+
+  @override
+  String get fallbackModePath {
+    _fallbackModePath ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 16, '');
+    return _fallbackModePath;
+  }
+
+  @override
+  List<idl.UnlinkedImport> get imports {
+    _imports ??= const fb.ListReader<idl.UnlinkedImport>(const _UnlinkedImportReader()).vTableGet(_bc, _bcOffset, 5, const <idl.UnlinkedImport>[]);
+    return _imports;
+  }
+
+  @override
+  List<idl.UnlinkedConst> get libraryAnnotations {
+    _libraryAnnotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 14, const <idl.UnlinkedConst>[]);
+    return _libraryAnnotations;
+  }
+
+  @override
+  idl.UnlinkedDocumentationComment get libraryDocumentationComment {
+    _libraryDocumentationComment ??= const _UnlinkedDocumentationCommentReader().vTableGet(_bc, _bcOffset, 9, null);
+    return _libraryDocumentationComment;
+  }
+
+  @override
+  String get libraryName {
+    _libraryName ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 6, '');
+    return _libraryName;
+  }
+
+  @override
+  int get libraryNameLength {
+    _libraryNameLength ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 7, 0);
+    return _libraryNameLength;
+  }
+
+  @override
+  int get libraryNameOffset {
+    _libraryNameOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 8, 0);
+    return _libraryNameOffset;
+  }
+
+  @override
+  List<int> get lineStarts {
+    _lineStarts ??= const fb.Uint32ListReader().vTableGet(_bc, _bcOffset, 17, const <int>[]);
+    return _lineStarts;
+  }
+
+  @override
+  List<idl.UnlinkedPart> get parts {
+    _parts ??= const fb.ListReader<idl.UnlinkedPart>(const _UnlinkedPartReader()).vTableGet(_bc, _bcOffset, 11, const <idl.UnlinkedPart>[]);
+    return _parts;
+  }
+
+  @override
+  idl.UnlinkedPublicNamespace get publicNamespace {
+    _publicNamespace ??= const _UnlinkedPublicNamespaceReader().vTableGet(_bc, _bcOffset, 0, null);
+    return _publicNamespace;
+  }
+
+  @override
+  List<idl.UnlinkedReference> get references {
+    _references ??= const fb.ListReader<idl.UnlinkedReference>(const _UnlinkedReferenceReader()).vTableGet(_bc, _bcOffset, 1, const <idl.UnlinkedReference>[]);
+    return _references;
+  }
+
+  @override
+  List<idl.UnlinkedTypedef> get typedefs {
+    _typedefs ??= const fb.ListReader<idl.UnlinkedTypedef>(const _UnlinkedTypedefReader()).vTableGet(_bc, _bcOffset, 10, const <idl.UnlinkedTypedef>[]);
+    return _typedefs;
+  }
+
+  @override
+  List<idl.UnlinkedVariable> get variables {
+    _variables ??= const fb.ListReader<idl.UnlinkedVariable>(const _UnlinkedVariableReader()).vTableGet(_bc, _bcOffset, 3, const <idl.UnlinkedVariable>[]);
+    return _variables;
+  }
+}
+
+abstract class _UnlinkedUnitMixin implements idl.UnlinkedUnit {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (classes.isNotEmpty) _result["classes"] = classes.map((_value) => _value.toJson()).toList();
+    if (codeRange != null) _result["codeRange"] = codeRange.toJson();
+    if (enums.isNotEmpty) _result["enums"] = enums.map((_value) => _value.toJson()).toList();
+    if (executables.isNotEmpty) _result["executables"] = executables.map((_value) => _value.toJson()).toList();
+    if (exports.isNotEmpty) _result["exports"] = exports.map((_value) => _value.toJson()).toList();
+    if (fallbackModePath != '') _result["fallbackModePath"] = fallbackModePath;
+    if (imports.isNotEmpty) _result["imports"] = imports.map((_value) => _value.toJson()).toList();
+    if (libraryAnnotations.isNotEmpty) _result["libraryAnnotations"] = libraryAnnotations.map((_value) => _value.toJson()).toList();
+    if (libraryDocumentationComment != null) _result["libraryDocumentationComment"] = libraryDocumentationComment.toJson();
+    if (libraryName != '') _result["libraryName"] = libraryName;
+    if (libraryNameLength != 0) _result["libraryNameLength"] = libraryNameLength;
+    if (libraryNameOffset != 0) _result["libraryNameOffset"] = libraryNameOffset;
+    if (lineStarts.isNotEmpty) _result["lineStarts"] = lineStarts;
+    if (parts.isNotEmpty) _result["parts"] = parts.map((_value) => _value.toJson()).toList();
+    if (publicNamespace != null) _result["publicNamespace"] = publicNamespace.toJson();
+    if (references.isNotEmpty) _result["references"] = references.map((_value) => _value.toJson()).toList();
+    if (typedefs.isNotEmpty) _result["typedefs"] = typedefs.map((_value) => _value.toJson()).toList();
+    if (variables.isNotEmpty) _result["variables"] = variables.map((_value) => _value.toJson()).toList();
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "classes": classes,
+    "codeRange": codeRange,
+    "enums": enums,
+    "executables": executables,
+    "exports": exports,
+    "fallbackModePath": fallbackModePath,
+    "imports": imports,
+    "libraryAnnotations": libraryAnnotations,
+    "libraryDocumentationComment": libraryDocumentationComment,
+    "libraryName": libraryName,
+    "libraryNameLength": libraryNameLength,
+    "libraryNameOffset": libraryNameOffset,
+    "lineStarts": lineStarts,
+    "parts": parts,
+    "publicNamespace": publicNamespace,
+    "references": references,
+    "typedefs": typedefs,
+    "variables": variables,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+
+class UnlinkedVariableBuilder extends Object with _UnlinkedVariableMixin implements idl.UnlinkedVariable {
+  List<UnlinkedConstBuilder> _annotations;
+  CodeRangeBuilder _codeRange;
+  UnlinkedDocumentationCommentBuilder _documentationComment;
+  int _inferredTypeSlot;
+  UnlinkedExecutableBuilder _initializer;
+  bool _isConst;
+  bool _isFinal;
+  bool _isStatic;
+  String _name;
+  int _nameOffset;
+  int _propagatedTypeSlot;
+  EntityRefBuilder _type;
+  int _visibleLength;
+  int _visibleOffset;
+
+  @override
+  List<UnlinkedConstBuilder> get annotations => _annotations ??= <UnlinkedConstBuilder>[];
+
+  /**
+   * Annotations for this variable.
+   */
+  void set annotations(List<UnlinkedConstBuilder> value) {
+    this._annotations = value;
+  }
+
+  @override
+  CodeRangeBuilder get codeRange => _codeRange;
+
+  /**
+   * Code range of the variable.
+   */
+  void set codeRange(CodeRangeBuilder value) {
+    this._codeRange = value;
+  }
+
+  @override
+  UnlinkedDocumentationCommentBuilder get documentationComment => _documentationComment;
+
+  /**
+   * Documentation comment for the variable, or `null` if there is no
+   * documentation comment.
+   */
+  void set documentationComment(UnlinkedDocumentationCommentBuilder value) {
+    this._documentationComment = value;
+  }
+
+  @override
+  int get inferredTypeSlot => _inferredTypeSlot ??= 0;
+
+  /**
+   * If this variable is inferable, nonzero slot id identifying which entry in
+   * [LinkedLibrary.types] contains the inferred type for this variable.  If
+   * there is no matching entry in [LinkedLibrary.types], then no type was
+   * inferred for this variable, so its static type is `dynamic`.
+   */
+  void set inferredTypeSlot(int value) {
+    assert(value == null || value >= 0);
+    this._inferredTypeSlot = value;
+  }
+
+  @override
+  UnlinkedExecutableBuilder get initializer => _initializer;
+
+  /**
+   * The synthetic initializer function of the variable.  Absent if the variable
+   * does not have an initializer.
+   */
+  void set initializer(UnlinkedExecutableBuilder value) {
+    this._initializer = value;
+  }
+
+  @override
+  bool get isConst => _isConst ??= false;
+
+  /**
+   * Indicates whether the variable is declared using the `const` keyword.
+   */
+  void set isConst(bool value) {
+    this._isConst = value;
+  }
+
+  @override
+  bool get isFinal => _isFinal ??= false;
+
+  /**
+   * Indicates whether the variable is declared using the `final` keyword.
+   */
+  void set isFinal(bool value) {
+    this._isFinal = value;
+  }
+
+  @override
+  bool get isStatic => _isStatic ??= false;
+
+  /**
+   * Indicates whether the variable is declared using the `static` keyword.
+   *
+   * Note that for top level variables, this flag is false, since they are not
+   * declared using the `static` keyword (even though they are considered
+   * static for semantic purposes).
+   */
+  void set isStatic(bool value) {
+    this._isStatic = value;
+  }
+
+  @override
+  String get name => _name ??= '';
+
+  /**
+   * Name of the variable.
+   */
+  void set name(String value) {
+    this._name = value;
+  }
+
+  @override
+  int get nameOffset => _nameOffset ??= 0;
+
+  /**
+   * Offset of the variable name relative to the beginning of the file.
+   */
+  void set nameOffset(int value) {
+    assert(value == null || value >= 0);
+    this._nameOffset = value;
+  }
+
+  @override
+  int get propagatedTypeSlot => _propagatedTypeSlot ??= 0;
+
+  /**
+   * If this variable is propagable, nonzero slot id identifying which entry in
+   * [LinkedLibrary.types] contains the propagated type for this variable.  If
+   * there is no matching entry in [LinkedLibrary.types], then this variable's
+   * propagated type is the same as its declared type.
+   *
+   * Non-propagable variables have a [propagatedTypeSlot] of zero.
+   */
+  void set propagatedTypeSlot(int value) {
+    assert(value == null || value >= 0);
+    this._propagatedTypeSlot = value;
+  }
+
+  @override
+  EntityRefBuilder get type => _type;
+
+  /**
+   * Declared type of the variable.  Absent if the type is implicit.
+   */
+  void set type(EntityRefBuilder value) {
+    this._type = value;
+  }
+
+  @override
+  int get visibleLength => _visibleLength ??= 0;
+
+  /**
+   * If a local variable, the length of the visible range; zero otherwise.
+   */
+  void set visibleLength(int value) {
+    assert(value == null || value >= 0);
+    this._visibleLength = value;
+  }
+
+  @override
+  int get visibleOffset => _visibleOffset ??= 0;
+
+  /**
+   * If a local variable, the beginning of the visible range; zero otherwise.
+   */
+  void set visibleOffset(int value) {
+    assert(value == null || value >= 0);
+    this._visibleOffset = value;
+  }
+
+  UnlinkedVariableBuilder({List<UnlinkedConstBuilder> annotations, CodeRangeBuilder codeRange, UnlinkedDocumentationCommentBuilder documentationComment, int inferredTypeSlot, UnlinkedExecutableBuilder initializer, bool isConst, bool isFinal, bool isStatic, String name, int nameOffset, int propagatedTypeSlot, EntityRefBuilder type, int visibleLength, int visibleOffset})
+    : _annotations = annotations,
+      _codeRange = codeRange,
+      _documentationComment = documentationComment,
+      _inferredTypeSlot = inferredTypeSlot,
+      _initializer = initializer,
+      _isConst = isConst,
+      _isFinal = isFinal,
+      _isStatic = isStatic,
+      _name = name,
+      _nameOffset = nameOffset,
+      _propagatedTypeSlot = propagatedTypeSlot,
+      _type = type,
+      _visibleLength = visibleLength,
+      _visibleOffset = visibleOffset;
+
+  /**
+   * Flush [informative] data recursively.
+   */
+  void flushInformative() {
+    _annotations?.forEach((b) => b.flushInformative());
+    _codeRange = null;
+    _documentationComment = null;
+    _initializer?.flushInformative();
+    _nameOffset = null;
+    _type?.flushInformative();
+  }
+
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(api_sig.ApiSignature signature) {
+    signature.addString(this._name ?? '');
+    signature.addInt(this._propagatedTypeSlot ?? 0);
+    signature.addBool(this._type != null);
+    this._type?.collectApiSignature(signature);
+    signature.addBool(this._isStatic == true);
+    signature.addBool(this._isConst == true);
+    signature.addBool(this._isFinal == true);
+    if (this._annotations == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._annotations.length);
+      for (var x in this._annotations) {
+        x?.collectApiSignature(signature);
+      }
+    }
+    signature.addInt(this._inferredTypeSlot ?? 0);
+    signature.addInt(this._visibleLength ?? 0);
+    signature.addInt(this._visibleOffset ?? 0);
+    signature.addBool(this._initializer != null);
+    this._initializer?.collectApiSignature(signature);
+  }
+
+  fb.Offset finish(fb.Builder fbBuilder) {
+    fb.Offset offset_annotations;
+    fb.Offset offset_codeRange;
+    fb.Offset offset_documentationComment;
+    fb.Offset offset_initializer;
+    fb.Offset offset_name;
+    fb.Offset offset_type;
+    if (!(_annotations == null || _annotations.isEmpty)) {
+      offset_annotations = fbBuilder.writeList(_annotations.map((b) => b.finish(fbBuilder)).toList());
+    }
+    if (_codeRange != null) {
+      offset_codeRange = _codeRange.finish(fbBuilder);
+    }
+    if (_documentationComment != null) {
+      offset_documentationComment = _documentationComment.finish(fbBuilder);
+    }
+    if (_initializer != null) {
+      offset_initializer = _initializer.finish(fbBuilder);
+    }
+    if (_name != null) {
+      offset_name = fbBuilder.writeString(_name);
+    }
+    if (_type != null) {
+      offset_type = _type.finish(fbBuilder);
+    }
+    fbBuilder.startTable();
+    if (offset_annotations != null) {
+      fbBuilder.addOffset(8, offset_annotations);
+    }
+    if (offset_codeRange != null) {
+      fbBuilder.addOffset(5, offset_codeRange);
+    }
+    if (offset_documentationComment != null) {
+      fbBuilder.addOffset(10, offset_documentationComment);
+    }
+    if (_inferredTypeSlot != null && _inferredTypeSlot != 0) {
+      fbBuilder.addUint32(9, _inferredTypeSlot);
+    }
+    if (offset_initializer != null) {
+      fbBuilder.addOffset(13, offset_initializer);
+    }
+    if (_isConst == true) {
+      fbBuilder.addBool(6, true);
+    }
+    if (_isFinal == true) {
+      fbBuilder.addBool(7, true);
+    }
+    if (_isStatic == true) {
+      fbBuilder.addBool(4, true);
+    }
+    if (offset_name != null) {
+      fbBuilder.addOffset(0, offset_name);
+    }
+    if (_nameOffset != null && _nameOffset != 0) {
+      fbBuilder.addUint32(1, _nameOffset);
+    }
+    if (_propagatedTypeSlot != null && _propagatedTypeSlot != 0) {
+      fbBuilder.addUint32(2, _propagatedTypeSlot);
+    }
+    if (offset_type != null) {
+      fbBuilder.addOffset(3, offset_type);
+    }
+    if (_visibleLength != null && _visibleLength != 0) {
+      fbBuilder.addUint32(11, _visibleLength);
+    }
+    if (_visibleOffset != null && _visibleOffset != 0) {
+      fbBuilder.addUint32(12, _visibleOffset);
+    }
+    return fbBuilder.endTable();
+  }
+}
+
+class _UnlinkedVariableReader extends fb.TableReader<_UnlinkedVariableImpl> {
+  const _UnlinkedVariableReader();
+
+  @override
+  _UnlinkedVariableImpl createObject(fb.BufferContext bc, int offset) => new _UnlinkedVariableImpl(bc, offset);
+}
+
+class _UnlinkedVariableImpl extends Object with _UnlinkedVariableMixin implements idl.UnlinkedVariable {
+  final fb.BufferContext _bc;
+  final int _bcOffset;
+
+  _UnlinkedVariableImpl(this._bc, this._bcOffset);
+
+  List<idl.UnlinkedConst> _annotations;
+  idl.CodeRange _codeRange;
+  idl.UnlinkedDocumentationComment _documentationComment;
+  int _inferredTypeSlot;
+  idl.UnlinkedExecutable _initializer;
+  bool _isConst;
+  bool _isFinal;
+  bool _isStatic;
+  String _name;
+  int _nameOffset;
+  int _propagatedTypeSlot;
+  idl.EntityRef _type;
+  int _visibleLength;
+  int _visibleOffset;
+
+  @override
+  List<idl.UnlinkedConst> get annotations {
+    _annotations ??= const fb.ListReader<idl.UnlinkedConst>(const _UnlinkedConstReader()).vTableGet(_bc, _bcOffset, 8, const <idl.UnlinkedConst>[]);
+    return _annotations;
+  }
+
+  @override
+  idl.CodeRange get codeRange {
+    _codeRange ??= const _CodeRangeReader().vTableGet(_bc, _bcOffset, 5, null);
+    return _codeRange;
+  }
+
+  @override
+  idl.UnlinkedDocumentationComment get documentationComment {
+    _documentationComment ??= const _UnlinkedDocumentationCommentReader().vTableGet(_bc, _bcOffset, 10, null);
+    return _documentationComment;
+  }
+
+  @override
+  int get inferredTypeSlot {
+    _inferredTypeSlot ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 9, 0);
+    return _inferredTypeSlot;
+  }
+
+  @override
+  idl.UnlinkedExecutable get initializer {
+    _initializer ??= const _UnlinkedExecutableReader().vTableGet(_bc, _bcOffset, 13, null);
+    return _initializer;
+  }
+
+  @override
+  bool get isConst {
+    _isConst ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 6, false);
+    return _isConst;
+  }
+
+  @override
+  bool get isFinal {
+    _isFinal ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 7, false);
+    return _isFinal;
+  }
+
+  @override
+  bool get isStatic {
+    _isStatic ??= const fb.BoolReader().vTableGet(_bc, _bcOffset, 4, false);
+    return _isStatic;
+  }
+
+  @override
+  String get name {
+    _name ??= const fb.StringReader().vTableGet(_bc, _bcOffset, 0, '');
+    return _name;
+  }
+
+  @override
+  int get nameOffset {
+    _nameOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 1, 0);
+    return _nameOffset;
+  }
+
+  @override
+  int get propagatedTypeSlot {
+    _propagatedTypeSlot ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 2, 0);
+    return _propagatedTypeSlot;
+  }
+
+  @override
+  idl.EntityRef get type {
+    _type ??= const _EntityRefReader().vTableGet(_bc, _bcOffset, 3, null);
+    return _type;
+  }
+
+  @override
+  int get visibleLength {
+    _visibleLength ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 11, 0);
+    return _visibleLength;
+  }
+
+  @override
+  int get visibleOffset {
+    _visibleOffset ??= const fb.Uint32Reader().vTableGet(_bc, _bcOffset, 12, 0);
+    return _visibleOffset;
+  }
+}
+
+abstract class _UnlinkedVariableMixin implements idl.UnlinkedVariable {
+  @override
+  Map<String, Object> toJson() {
+    Map<String, Object> _result = <String, Object>{};
+    if (annotations.isNotEmpty) _result["annotations"] = annotations.map((_value) => _value.toJson()).toList();
+    if (codeRange != null) _result["codeRange"] = codeRange.toJson();
+    if (documentationComment != null) _result["documentationComment"] = documentationComment.toJson();
+    if (inferredTypeSlot != 0) _result["inferredTypeSlot"] = inferredTypeSlot;
+    if (initializer != null) _result["initializer"] = initializer.toJson();
+    if (isConst != false) _result["isConst"] = isConst;
+    if (isFinal != false) _result["isFinal"] = isFinal;
+    if (isStatic != false) _result["isStatic"] = isStatic;
+    if (name != '') _result["name"] = name;
+    if (nameOffset != 0) _result["nameOffset"] = nameOffset;
+    if (propagatedTypeSlot != 0) _result["propagatedTypeSlot"] = propagatedTypeSlot;
+    if (type != null) _result["type"] = type.toJson();
+    if (visibleLength != 0) _result["visibleLength"] = visibleLength;
+    if (visibleOffset != 0) _result["visibleOffset"] = visibleOffset;
+    return _result;
+  }
+
+  @override
+  Map<String, Object> toMap() => {
+    "annotations": annotations,
+    "codeRange": codeRange,
+    "documentationComment": documentationComment,
+    "inferredTypeSlot": inferredTypeSlot,
+    "initializer": initializer,
+    "isConst": isConst,
+    "isFinal": isFinal,
+    "isStatic": isStatic,
+    "name": name,
+    "nameOffset": nameOffset,
+    "propagatedTypeSlot": propagatedTypeSlot,
+    "type": type,
+    "visibleLength": visibleLength,
+    "visibleOffset": visibleOffset,
+  };
+
+  @override
+  String toString() => convert.JSON.encode(toJson());
+}
+