Use factory constructor for list literals

lib/src/compiler/code_generator.dart

 // Copyright (c) 2015, 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.
 
 import 'dart:collection' show HashMap, HashSet;
 import 'dart:math' show min, max;
 
 import 'package:analyzer/analyzer.dart' hide ConstantEvaluator;
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart' show Token, TokenType;
@@ skipping 4217 matching lines @@
       JS.Expression list = new JS.ArrayInitializer(
           _visitList(node.elements) as List<JS.Expression>);
       ParameterizedType type = node.staticType;
       var elementType = type.typeArguments.single;
       // TODO(jmesserly): analyzer will usually infer `List<Object>` because
       // that is the least upper bound of the element types. So we rarely
       // generate a plain `List<dynamic>` anymore.
       if (!elementType.isDynamic || isConst) {
         // dart.list helper internally depends on _interceptors.JSArray.
         _declareBeforeUse(_jsArray);
-        var typeRep = _emitType(elementType);
-        var helper = (isConst) ? 'constList' : 'list';
-        list = js.call('dart.${helper}(#, #)', [list, typeRep]);
+        if (isConst) {
+          var typeRep = _emitType(elementType);
+          list = js.call('dart.constList(#, #)', [list, typeRep]);
+        } else {
+          // Call `new JSArray<E>.of(list)`
+          var jsArrayType = _jsArray.type.instantiate(type.typeArguments);
+          list = js.call('#.of(#)', [_emitType(jsArrayType), list]);
+        }
       }
       return list;
     }
     if (isConst) return _cacheConst(emitList);
     return emitList();
   }
 
   @override
   visitMapLiteral(MapLiteral node) {
     // TODO(jmesserly): we can likely make these faster.
@@ skipping 376 matching lines @@
 }
 
 bool isLibraryPrefix(Expression node) =>
     node is SimpleIdentifier && node.staticElement is PrefixElement;
 
 LibraryElement _getLibrary(AnalysisContext c, String uri) =>
     c.computeLibraryElement(c.sourceFactory.forUri(uri));
 
 bool _isDartRuntime(LibraryElement l) =>
     l.isInSdk && l.source.uri.toString() == 'dart:_runtime';