Represent runtime type information as nested lists.

sdk/lib/_internal/compiler/implementation/js_backend/constant_emitter.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.
 
 part of js_backend;
 
 class ConstantEmitter  {
   ConstantReferenceEmitter _referenceEmitter;
   ConstantInitializerEmitter _initializerEmitter;
 
@@ skipping 282 matching lines @@
         arguments);
   }
 
   js.Expression visitType(TypeConstant constant) {
     SourceString helperSourceName = const SourceString('createRuntimeType');
     Element helper = compiler.findHelper(helperSourceName);
     JavaScriptBackend backend = compiler.backend;
     String helperName = backend.namer.getName(helper);
     DartType type = constant.representedType;
     Element element = type.element;
-    String typeName;
-    if (type.kind == TypeKind.INTERFACE) {
-      typeName =
-          backend.rti.getStringRepresentation(type, expandRawType: true);
-    } else {
-      assert(type.kind == TypeKind.TYPEDEF);
-      typeName = element.name.slowToString();
-    }
+    String name = backend.rti.getRawTypeRepresentation(type);
+    js.Expression typeName = new js.LiteralString("'$name'");
     return new js.Call(
         new js.PropertyAccess.field(
             new js.VariableUse(namer.CURRENT_ISOLATE),
             helperName),
-        [new js.LiteralString("'$typeName'")]);
+        [typeName]);
   }
 
   js.Expression visitConstructed(ConstructedConstant constant) {
     return new js.New(
         new js.VariableUse(getJsConstructor(constant.type.element)),
         _array(constant.fields));
   }
 
   List<js.Expression> _array(List<Constant> values) {
     List<js.Expression> valueList = <js.Expression>[];
     for (int i = 0; i < values.length; i++) {
       valueList.add(_reference(values[i]));
     }
     return valueList;
   }
 }