Add an "api signature" to summaries.

pkg/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;
@@ skipping 198 matching lines @@
       _length = length,
       _message = message,
       _offset = offset;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.ApiSignature signature) {
+    signature.addString(this._errorCodeUniqueName ?? '');
+    signature.addInt(this._offset ?? 0);
+    signature.addInt(this._length ?? 0);
+    signature.addString(this._message ?? '');
+    signature.addString(this._correction ?? '');
+  }
+
   fb.Offset finish(fb.Builder fbBuilder) {
     fb.Offset offset_correction;
     fb.Offset offset_errorCodeUniqueName;
     fb.Offset offset_message;
     if (_correction != null) {
       offset_correction = fbBuilder.writeString(_correction);
     }
     if (_errorCodeUniqueName != null) {
       offset_errorCodeUniqueName = fbBuilder.writeString(_errorCodeUniqueName);
     }
@@ skipping 149 matching lines @@
       _importedUris = importedUris,
       _kind = kind,
       _partUris = partUris;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.ApiSignature signature) {
+    signature.addInt(this._kind == null ? 0 : this._kind.index);
+    if (this._importedUris == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._importedUris.length);
+      for (var x in this._importedUris) {
+        signature.addString(x);
+      }
+    }
+    if (this._exportedUris == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._exportedUris.length);
+      for (var x in this._exportedUris) {
+        signature.addString(x);
+      }
+    }
+    if (this._partUris == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._partUris.length);
+      for (var x in this._partUris) {
+        signature.addString(x);
+      }
+    }
+  }
+
   List<int> toBuffer() {
     fb.Builder fbBuilder = new fb.Builder();
     return fbBuilder.finish(finish(fbBuilder), "CaSS");
   }
 
   fb.Offset finish(fb.Builder fbBuilder) {
     fb.Offset offset_exportedUris;
     fb.Offset offset_importedUris;
     fb.Offset offset_partUris;
     if (!(_exportedUris == null || _exportedUris.isEmpty)) {
@@ skipping 109 matching lines @@
   CacheSourceErrorsInLibraryBuilder({List<CacheAnalysisErrorBuilder> errors})
     : _errors = errors;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _errors?.forEach((b) => b.flushInformative());
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.ApiSignature signature) {
+    if (this._errors == null) {
+      signature.addInt(0);
+    } else {
+      signature.addInt(this._errors.length);
+      for (var x in this._errors) {
+        x?.collectApiSignature(signature);
+      }
+    }
+  }
+
   List<int> toBuffer() {
     fb.Builder fbBuilder = new fb.Builder();
     return fbBuilder.finish(finish(fbBuilder), "CSEL");
   }
 
   fb.Offset finish(fb.Builder fbBuilder) {
     fb.Offset offset_errors;
     if (!(_errors == null || _errors.isEmpty)) {
       offset_errors = fbBuilder.writeList(_errors.map((b) => b.finish(fbBuilder)).toList());
     }
@@ skipping 78 matching lines @@
   CodeRangeBuilder({int length, int offset})
     : _length = length,
       _offset = offset;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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();
   }
@@ skipping 188 matching lines @@
 
   /**
    * 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(fb.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());
@@ skipping 155 matching lines @@
   LinkedDependencyBuilder({List<String> parts, String uri})
     : _parts = parts,
       _uri = uri;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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();
@@ skipping 113 matching lines @@
       _kind = kind,
       _name = name,
       _unit = unit;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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) {
@@ skipping 193 matching lines @@
 
   /**
    * 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(fb.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;
@@ skipping 256 matching lines @@
       _name = name,
       _numTypeParameters = numTypeParameters,
       _unit = unit;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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) {
@@ skipping 160 matching lines @@
       _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(fb.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);
+      }
+    }
+  }
+
   fb.Offset finish(fb.Builder fbBuilder) {
     fb.Offset offset_constCycles;
     fb.Offset offset_references;
     fb.Offset offset_types;
     if (!(_constCycles == null || _constCycles.isEmpty)) {
       offset_constCycles = fbBuilder.writeListUint32(_constCycles);
     }
     if (!(_references == null || _references.isEmpty)) {
       offset_references = fbBuilder.writeList(_references.map((b) => b.finish(fbBuilder)).toList());
     }
@@ skipping 65 matching lines @@
     "constCycles": constCycles,
     "references": references,
     "types": types,
   };
 
   @override
   String toString() => convert.JSON.encode(toJson());
 }
 
 class PackageBundleBuilder extends Object with _PackageBundleMixin implements idl.PackageBundle {
+  String _apiSignature;
   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) {
+    _apiSignature = _value;
+  }
+
+  @override
   List<LinkedLibraryBuilder> get linkedLibraries => _linkedLibraries ??= <LinkedLibraryBuilder>[];
 
   /**
    * Linked libraries.
    */
   void set linkedLibraries(List<LinkedLibraryBuilder> _value) {
     _linkedLibraries = _value;
   }
 
   @override
@@ skipping 55 matching lines @@
   @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) {
     _unlinkedUnitUris = _value;
   }
 
-  PackageBundleBuilder({List<LinkedLibraryBuilder> linkedLibraries, List<String> linkedLibraryUris, int majorVersion, int minorVersion, List<String> unlinkedUnitHashes, List<UnlinkedUnitBuilder> unlinkedUnits, List<String> unlinkedUnitUris})
-    : _linkedLibraries = linkedLibraries,
+  PackageBundleBuilder({String apiSignature, List<LinkedLibraryBuilder> linkedLibraries, List<String> linkedLibraryUris, int majorVersion, int minorVersion, List<String> unlinkedUnitHashes, List<UnlinkedUnitBuilder> unlinkedUnits, List<String> unlinkedUnitUris})
+    : _apiSignature = apiSignature,
+      _linkedLibraries = linkedLibraries,
       _linkedLibraryUris = linkedLibraryUris,
       _majorVersion = majorVersion,
       _minorVersion = minorVersion,
       _unlinkedUnitHashes = unlinkedUnitHashes,
       _unlinkedUnits = unlinkedUnits,
       _unlinkedUnitUris = unlinkedUnitUris;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _linkedLibraries?.forEach((b) => b.flushInformative());
     _unlinkedUnitHashes = null;
     _unlinkedUnits?.forEach((b) => b.flushInformative());
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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_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 (!(_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_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) {
@@ skipping 23 matching lines @@
   @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.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.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;
   }
@@ skipping 26 matching lines @@
   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 (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,
     "linkedLibraries": linkedLibraries,
     "linkedLibraryUris": linkedLibraryUris,
     "majorVersion": majorVersion,
     "minorVersion": minorVersion,
     "unlinkedUnitHashes": unlinkedUnitHashes,
     "unlinkedUnits": unlinkedUnits,
     "unlinkedUnitUris": unlinkedUnitUris,
   };
 
   @override
@@ skipping 138 matching lines @@
       _units = units,
       _unitUnitUris = unitUnitUris;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _units?.forEach((b) => b.flushInformative());
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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;
@@ skipping 357 matching lines @@
       _usedNameKinds = usedNameKinds,
       _usedNameOffsets = usedNameOffsets,
       _usedNames = usedNames;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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;
@@ skipping 413 matching lines @@
     _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(fb.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;
@@ skipping 288 matching lines @@
       _shows = shows;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _end = null;
     _offset = null;
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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();
@@ skipping 176 matching lines @@
       _references = references,
       _strings = strings;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _references?.forEach((b) => b.flushInformative());
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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());
     }
@@ skipping 203 matching lines @@
       _name = name;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _arguments?.forEach((b) => b.flushInformative());
     _expression?.flushInformative();
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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());
@@ skipping 144 matching lines @@
     : _length = length,
       _offset = offset,
       _text = text;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.ApiSignature signature) {
+    signature.addInt(this._length ?? 0);
+    signature.addString(this._text ?? '');
+    signature.addInt(this._offset ?? 0);
+  }
+
   fb.Offset finish(fb.Builder fbBuilder) {
     fb.Offset offset_text;
     if (_text != null) {
       offset_text = fbBuilder.writeString(_text);
     }
     fbBuilder.startTable();
     if (_length != null && _length != 0) {
       fbBuilder.addUint32(0, _length);
     }
     if (_offset != null && _offset != 0) {
@@ skipping 145 matching lines @@
    * 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(fb.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) {
@@ skipping 158 matching lines @@
       _nameOffset = nameOffset;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _documentationComment = null;
     _nameOffset = null;
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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();
@@ skipping 489 matching lines @@
     _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(fb.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;
@@ skipping 499 matching lines @@
   /**
    * 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(fb.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) {
@@ skipping 103 matching lines @@
     : _combinators = combinators,
       _uri = uri;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _combinators?.forEach((b) => b.flushInformative());
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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);
+      }
+    }
+  }
+
   fb.Offset finish(fb.Builder fbBuilder) {
     fb.Offset offset_combinators;
     fb.Offset offset_uri;
     if (!(_combinators == null || _combinators.isEmpty)) {
       offset_combinators = fbBuilder.writeList(_combinators.map((b) => b.finish(fbBuilder)).toList());
     }
     if (_uri != null) {
       offset_uri = fbBuilder.writeString(_uri);
     }
     fbBuilder.startTable();
@@ skipping 196 matching lines @@
    */
   void flushInformative() {
     _annotations?.forEach((b) => b.flushInformative());
     _combinators?.forEach((b) => b.flushInformative());
     _offset = null;
     _prefixOffset = null;
     _uriEnd = null;
     _uriOffset = null;
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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);
+  }
+
   fb.Offset finish(fb.Builder fbBuilder) {
     fb.Offset offset_annotations;
     fb.Offset offset_combinators;
     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());
     }
@@ skipping 209 matching lines @@
       _name = name,
       _nameOffset = nameOffset;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _nameOffset = null;
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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) {
@@ skipping 270 matching lines @@
   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(fb.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);
+  }
+
   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());
@@ skipping 265 matching lines @@
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _annotations?.forEach((b) => b.flushInformative());
     _uriEnd = null;
     _uriOffset = null;
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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) {
@@ skipping 122 matching lines @@
       _name = name,
       _numTypeParameters = numTypeParameters;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
     _members?.forEach((b) => b.flushInformative());
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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();
@@ skipping 123 matching lines @@
       _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(fb.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)) {
@@ skipping 116 matching lines @@
   UnlinkedReferenceBuilder({String name, int prefixReference})
     : _name = name,
       _prefixReference = prefixReference;
 
   /**
    * Flush [informative] data recursively.
    */
   void flushInformative() {
   }
 
+  /**
+   * Accumulate non-[informative] data into [signature].
+   */
+  void collectApiSignature(fb.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) {
@@ skipping 159 matching lines @@
   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(fb.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());
@@ skipping 216 matching lines @@
   /**
    * 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(fb.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);
@@ skipping 336 matching lines @@
     _libraryDocumentationComment = null;
     _libraryNameLength = null;
     _libraryNameOffset = 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(fb.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;
@@ skipping 493 matching lines @@
    */
   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(fb.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());
     }
@@ skipping 208 matching lines @@
     "propagatedTypeSlot": propagatedTypeSlot,
     "type": type,
     "visibleLength": visibleLength,
     "visibleOffset": visibleOffset,
   };
 
   @override
   String toString() => convert.JSON.encode(toJson());
 }