Use entities in impact transformers.

pkg/compiler/lib/src/common_elements.dart

 // Copyright (c) 2014, 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.
 
 // TODO(sigmund): rename and move to common/elements.dart
 library dart2js.type_system;
 
 import 'common/names.dart' show Uris;
 import 'elements/types.dart';
 import 'elements/entities.dart';
@@ skipping 193 matching lines @@
   bool isStringOnlySupertype(ClassEntity element);
 
   /// Returns `true` if [element] is a superclass of `List`.
   bool isListSupertype(ClassEntity element);
 }
 
 /// Interface for accessing libraries, classes and members.
 ///
 /// The _env makes private and injected members directly available and
 /// should therefore not be used to determine scopes.
+// TODO(johnniwinther): Split this into an element environment and a type query
+// interface, the first should only be used during resolution and the latter in
+// both resolution and codegen.
 abstract class ElementEnvironment {
   /// Returns the main library for the compilation.
   LibraryEntity get mainLibrary;
 
   /// Returns the main method for the compilation.
   FunctionEntity get mainFunction;
 
   /// Lookup the library with the canonical [uri], fail if the library is
   /// missing and [required];
   LibraryEntity lookupLibrary(Uri uri, {bool required: false});
@@ skipping 64 matching lines @@
   /// The upper bound on the [typeVariable]. If not explicitly declared, this is
   /// `Object`.
   DartType getTypeVariableBound(TypeVariableEntity typeVariable);
 
   /// Returns `true` if [a] is a subtype of [b].
   bool isSubtype(DartType a, DartType b);
 
   /// Returns the type if [function].
   FunctionType getFunctionType(FunctionEntity function);
 
+  /// Returns the type of the [local] function.
+  FunctionType getLocalFunctionType(Local local);
+
+  /// Returns the unaliased type of [type].
+  ///
+  /// Use this during resolution to ensure that the alias has been computed.
+  // TODO(johnniwinther): Remove this when the resolver is removed.
+  DartType getUnaliasedType(DartType type);
+
   /// Returns the [CallStructure] corresponding to calling [entity] with all
   /// arguments, both required and optional.
   CallStructure getCallStructure(FunctionEntity entity);
 
   /// Returns `true` if [member] a the synthetic getter `loadLibrary` injected
   /// on deferred libraries.
   bool isDeferredLoadLibraryGetter(MemberEntity member);
 }
 
 class CommonElementsImpl implements CommonElements {
@@ skipping 264 matching lines @@
   }
 
   @override
   InterfaceType streamType([DartType elementType]) {
     if (elementType == null) {
       return getRawType(streamClass);
     }
     return createInterfaceType(streamClass, [elementType]);
   }
 }