Change js_emitter parts into libraries

pkg/compiler/lib/src/js_emitter/js_emitter.dart

 // Copyright (c) 2013, 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.
 
 library dart2js.js_emitter;
 
-import 'package:js_ast/src/precedence.dart' as js_precedence;
-import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
-import 'package:js_runtime/shared/embedded_names.dart' show JsBuiltin;
-
-import '../closure.dart'
-    show ClosureClassElement, ClosureClassMap, ClosureFieldElement;
-import '../common.dart';
-import '../common/names.dart' show Identifiers;
-import '../common/tasks.dart' show CompilerTask;
-import '../compiler.dart' show Compiler;
-import '../constants/values.dart';
-import '../core_types.dart' show CommonElements;
-import '../elements/resolution_types.dart'
-    show
-        ResolutionDartType,
-        ResolutionFunctionType,
-        ResolutionInterfaceType,
-        ResolutionTypedefType,
-        Types,
-        ResolutionTypeVariableType;
-import '../deferred_load.dart' show OutputUnit;
 import '../elements/elements.dart'
     show
         ClassElement,
-        ConstructorElement,
-        Element,
-        ElementKind,
-        Entity,
-        FieldElement,
-        FunctionElement,
-        FunctionSignature,
-        MetadataAnnotation,
-        MethodElement,
-        MixinApplicationElement,
-        ParameterElement,
-        TypeVariableElement;
-import '../js/js.dart' as jsAst;
-import '../js/js.dart' show js;
-import '../js_backend/backend_helpers.dart' show BackendHelpers;
-import '../js_backend/js_backend.dart'
-    show
-        CustomElementsAnalysis,
-        JavaScriptBackend,
-        JavaScriptConstantCompiler,
-        Namer,
-        RuntimeTypes,
-        RuntimeTypesEncoder,
-        Substitution,
-        TypeCheck,
-        TypeChecks,
-        TypeVariableHandler;
-import '../universe/call_structure.dart' show CallStructure;
-import '../universe/selector.dart' show Selector;
-import '../universe/world_builder.dart'
-    show CodegenWorldBuilder, SelectorConstraints;
-import '../util/util.dart' show Setlet;
-import '../world.dart' show ClosedWorld;
-import 'full_emitter/emitter.dart' as full_js_emitter;
-import 'lazy_emitter/emitter.dart' as lazy_js_emitter;
-import 'model.dart';
-import 'program_builder/program_builder.dart';
-import 'startup_emitter/emitter.dart' as startup_js_emitter;
+        MixinApplicationElement;
 
-part 'class_stub_generator.dart';
-part 'code_emitter_task.dart';
+export 'class_stub_generator.dart';
+export 'code_emitter_task.dart';
+export 'interceptor_stub_generator.dart';
+export 'main_call_stub_generator.dart';
+export 'metadata_collector.dart';
+export 'native_emitter.dart';
+export 'native_generator.dart';
+export 'parameter_stub_generator.dart';
+export 'runtime_type_generator.dart';
+export 'type_test_registry.dart';
+
 part 'helpers.dart';

[Siggi Cherem (dart-lang), 2017/01/19 16:41:41]

such a lonely part :( 

Looking into it, it seems this is only used in program_builder/*, maybe move the
helper method to program_builder.dart?

There is an import from dart2js_incremental that shows the
computeMixinApplication function, but it seems unused.

-part 'interceptor_stub_generator.dart';
-part 'main_call_stub_generator.dart';
-part 'metadata_collector.dart';
-part 'native_emitter.dart';
-part 'native_generator.dart';
-part 'parameter_stub_generator.dart';
-part 'runtime_type_generator.dart';
-part 'type_test_registry.dart';