Emit program and dependency information as relations in a Prolog database.

sdk/lib/_internal/compiler/implementation/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 '../common.dart';
 
 import '../js/js.dart' as jsAst;
 
 import '../closure.dart' show
     ClosureClassElement,
     ClosureClassMap,
     ClosureFieldElement;
 
-import '../dart2jslib.dart' show
-    CodeBuffer;
+import '../dart2jslib.dart' show CodeBuffer, Relations;
 
 import '../elements/elements.dart' show
     TypeVariableElement,
     ConstructorBodyElement;
 
 import '../js/js.dart' show
     js, templateManager;
 
 import '../js_backend/js_backend.dart' show
     CheckedModeHelper,
     ConstantEmitter,
     CustomElementsAnalysis,
     JavaScriptBackend,
     JavaScriptConstantCompiler,
     Namer,
     NativeEmitter,
     RuntimeTypes,
     Substitution,
     TypeCheck,
     TypeChecks,
     TypeVariableHandler;
 
+import '../prolog/prolog.dart' as prolog;
+
 import '../source_file.dart' show
     SourceFile,
     StringSourceFile;
 
 import '../source_map_builder.dart' show
     SourceMapBuilder;
 
 import '../util/characters.dart' show
     $$,
     $A,
     $HASH,
     $PERIOD,
     $Z,
     $a,
     $z;
 
 import '../util/uri_extras.dart' show
     relativize;
 
 import '../deferred_load.dart' show
     OutputUnit;
+import 'dart:async';
 
 part 'class_builder.dart';
 part 'class_emitter.dart';
 part 'code_emitter_helper.dart';
 part 'code_emitter_task.dart';
 part 'container_builder.dart';
 part 'declarations.dart';
 part 'helpers.dart';
 part 'interceptor_emitter.dart';
 part 'metadata_emitter.dart';
 part 'nsm_emitter.dart';
 part 'reflection_data_parser.dart';
 part 'type_test_emitter.dart';