All strong mode cleaning of dart2js.

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

 // Copyright (c) 2012, 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.code_emitter_task;
 
 import 'package:js_runtime/shared/embedded_names.dart' show JsBuiltin;
 
 import '../common.dart';
 import '../common/tasks.dart' show CompilerTask;
@@ skipping 225 matching lines @@
       CodeEmitterTask task, Namer namer, ClosedWorld closedWorld);
 }
 
 abstract class Emitter {
   /// Uses the [programBuilder] to generate a model of the program, emits
   /// the program, and returns the size of the generated output.
   int emitProgram(ProgramBuilder programBuilder);
 
   /// Returns the JS function that must be invoked to get the value of the
   /// lazily initialized static.
-  jsAst.Expression isolateLazyInitializerAccess(FieldEntity element);
+  jsAst.Expression isolateLazyInitializerAccess(covariant FieldEntity element);
 
   /// Returns the closure expression of a static function.
-  jsAst.Expression isolateStaticClosureAccess(FunctionEntity element);
+  jsAst.Expression isolateStaticClosureAccess(covariant FunctionEntity element);
 
   /// Returns the JS code for accessing the embedded [global].
   jsAst.Expression generateEmbeddedGlobalAccess(String global);
 
   /// Returns the JS function representing the given function.
   ///
   /// The function must be invoked and can not be used as closure.
   jsAst.Expression staticFunctionAccess(FunctionEntity element);
 
   jsAst.Expression staticFieldAccess(FieldEntity element);
 
   /// Returns the JS constructor of the given element.
   ///
   /// The returned expression must only be used in a JS `new` expression.
   jsAst.Expression constructorAccess(ClassEntity e);
 
   /// Returns the JS prototype of the given class [e].
-  jsAst.Expression prototypeAccess(ClassEntity e, bool hasBeenInstantiated);
+  jsAst.Expression prototypeAccess(
+      covariant ClassEntity e, bool hasBeenInstantiated);
 
   /// Returns the JS constructor of the given interceptor class [e].
   jsAst.Expression interceptorClassAccess(ClassEntity e);
 
   /// Returns the JS expression representing the type [e].
   jsAst.Expression typeAccess(Entity e);
 
   /// Returns the JS expression representing a function that returns 'null'
   jsAst.Expression generateFunctionThatReturnsNull();
 
@@ skipping 43 matching lines @@
   jsAst.PropertyAccess staticFunctionAccess(FunctionEntity element) {
     return globalPropertyAccessForMember(element);
   }
 
   @override
   jsAst.PropertyAccess constructorAccess(ClassEntity element) {
     return globalPropertyAccessForClass(element);
   }
 
   @override
-  jsAst.PropertyAccess interceptorClassAccess(ClassEntity element) {
+  jsAst.Expression interceptorClassAccess(ClassEntity element) {
     return globalPropertyAccessForClass(element);
   }
 
   @override
-  jsAst.PropertyAccess typeAccess(Entity element) {
+  jsAst.Expression typeAccess(Entity element) {
     return globalPropertyAccessForType(element);
   }
 }