diff --git a/lib/runtime/dart/_interceptors.js b/lib/runtime/dart/_interceptors.js
index b17828a4..658cf797 100644
--- a/lib/runtime/dart/_interceptors.js
+++ b/lib/runtime/dart/_interceptors.js
@@ -448,6 +448,7 @@ dart.library('dart/_interceptors', null, /* Imports */[
       statics: () => ({markFixedList: [core.List, [core.List]]}),
       names: ['markFixedList']
     });
+    JSArray[dart.metadata] = () => [dart.const(new _js_helper.JsPeerInterface({name: 'Array'}))];
     return JSArray;
   });
   let JSArray = JSArray$();
@@ -925,6 +926,7 @@ dart.library('dart/_interceptors', null, /* Imports */[
     }),
     names: ['_bitCount', '_shru', '_shrs', '_ors', '_spread']
   });
+  JSInt[dart.metadata] = () => [dart.const(new _js_helper.JsPeerInterface({name: 'Number'}))];
   dart.registerExtension(dart.global.Number, JSInt);
   class JSDouble extends JSNumber {
     JSDouble() {
@@ -1436,6 +1438,7 @@ dart.library('dart/_interceptors', null, /* Imports */[
     }),
     names: ['_isWhitespace', '_skipLeadingWhitespace', '_skipTrailingWhitespace']
   });
+  JSString[dart.metadata] = () => [dart.const(new _js_helper.JsPeerInterface({name: 'String'}))];
   dart.registerExtension(dart.global.String, JSString);
   let _string = Symbol('_string');
   class _CodeUnits extends _internal.UnmodifiableListBase$(core.int) {
@@ -1481,6 +1484,7 @@ dart.library('dart/_interceptors', null, /* Imports */[
   dart.setSignature(JSBool, {
     constructors: () => ({JSBool: [JSBool, []]})
   });
+  JSBool[dart.metadata] = () => [dart.const(new _js_helper.JsPeerInterface({name: 'Boolean'}))];
   dart.registerExtension(dart.global.Boolean, JSBool);
   class JSIndexable extends core.Object {}
   class JSMutableIndexable extends JSIndexable {}
diff --git a/lib/runtime/dart/_native_typed_data.js b/lib/runtime/dart/_native_typed_data.js
index 3eec1f9d..5892f584 100644
--- a/lib/runtime/dart/_native_typed_data.js
+++ b/lib/runtime/dart/_native_typed_data.js
@@ -3,11 +3,11 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
   'dart/typed_data',
   'dart/collection',
   'dart/_internal',
-  'dart/_js_helper',
   'dart/math'
 ], /* Lazy imports */[
+  'dart/_js_helper',
   'dart/_interceptors'
-], function(exports, core, typed_data, collection, _internal, _js_helper, math, _interceptors) {
+], function(exports, core, typed_data, collection, _internal, math, _js_helper, _interceptors) {
   'use strict';
   class NativeByteBuffer extends core.Object {
     NativeByteBuffer() {
@@ -145,6 +145,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
       asByteData: [typed_data.ByteData, [], [core.int, core.int]]
     })
   });
+  NativeByteBuffer[dart.metadata] = () => [dart.const(new _js_helper.Native("ArrayBuffer"))];
   let _storage = Symbol('_storage');
   let _invalidIndex = Symbol('_invalidIndex');
   let _checkIndex = Symbol('_checkIndex');
@@ -510,6 +511,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
       [_checkSublistArguments]: [core.int, [core.int, core.int, core.int]]
     })
   });
+  NativeTypedData[dart.metadata] = () => [dart.const(new _js_helper.Native("ArrayBufferView"))];
   function _checkLength(length) {
     if (!(typeof length == 'number'))
       throw new core.ArgumentError(`Invalid length ${length}`);
@@ -701,6 +703,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
     }),
     names: ['_create1', '_create2', '_create3']
   });
+  NativeByteData[dart.metadata] = () => [dart.const(new _js_helper.Native("DataView"))];
   let _setRangeFast = Symbol('_setRangeFast');
   class NativeTypedArray extends NativeTypedData {
     NativeTypedArray() {
@@ -832,6 +835,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
     names: ['_create1', '_create2', '_create3']
   });
   dart.defineExtensionMembers(NativeFloat32List, ['sublist']);
+  NativeFloat32List[dart.metadata] = () => [dart.const(new _js_helper.Native("Float32Array"))];
   class NativeFloat64List extends NativeTypedArrayOfDouble {
     static new(length) {
       return NativeFloat64List._create1(_checkLength(length));
@@ -879,6 +883,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
     names: ['_create1', '_create2', '_create3']
   });
   dart.defineExtensionMembers(NativeFloat64List, ['sublist']);
+  NativeFloat64List[dart.metadata] = () => [dart.const(new _js_helper.Native("Float64Array"))];
   class NativeInt16List extends NativeTypedArrayOfInt {
     static new(length) {
       return NativeInt16List._create1(_checkLength(length));
@@ -933,6 +938,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
     names: ['_create1', '_create2', '_create3']
   });
   dart.defineExtensionMembers(NativeInt16List, ['get', 'sublist']);
+  NativeInt16List[dart.metadata] = () => [dart.const(new _js_helper.Native("Int16Array"))];
   class NativeInt32List extends NativeTypedArrayOfInt {
     static new(length) {
       return NativeInt32List._create1(_checkLength(length));
@@ -987,6 +993,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
     names: ['_create1', '_create2', '_create3']
   });
   dart.defineExtensionMembers(NativeInt32List, ['get', 'sublist']);
+  NativeInt32List[dart.metadata] = () => [dart.const(new _js_helper.Native("Int32Array"))];
   class NativeInt8List extends NativeTypedArrayOfInt {
     static new(length) {
       return NativeInt8List._create1(_checkLength(length));
@@ -1041,6 +1048,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
     names: ['_create1', '_create2', '_create3']
   });
   dart.defineExtensionMembers(NativeInt8List, ['get', 'sublist']);
+  NativeInt8List[dart.metadata] = () => [dart.const(new _js_helper.Native("Int8Array"))];
   class NativeUint16List extends NativeTypedArrayOfInt {
     static new(length) {
       return NativeUint16List._create1(_checkLength(length));
@@ -1095,6 +1103,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
     names: ['_create1', '_create2', '_create3']
   });
   dart.defineExtensionMembers(NativeUint16List, ['get', 'sublist']);
+  NativeUint16List[dart.metadata] = () => [dart.const(new _js_helper.Native("Uint16Array"))];
   class NativeUint32List extends NativeTypedArrayOfInt {
     static new(length) {
       return NativeUint32List._create1(_checkLength(length));
@@ -1149,6 +1158,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
     names: ['_create1', '_create2', '_create3']
   });
   dart.defineExtensionMembers(NativeUint32List, ['get', 'sublist']);
+  NativeUint32List[dart.metadata] = () => [dart.const(new _js_helper.Native("Uint32Array"))];
   class NativeUint8ClampedList extends NativeTypedArrayOfInt {
     static new(length) {
       return NativeUint8ClampedList._create1(_checkLength(length));
@@ -1206,6 +1216,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
     names: ['_create1', '_create2', '_create3']
   });
   dart.defineExtensionMembers(NativeUint8ClampedList, ['get', 'sublist', 'length']);
+  NativeUint8ClampedList[dart.metadata] = () => [dart.const(new _js_helper.Native("Uint8ClampedArray,CanvasPixelArray"))];
   class NativeUint8List extends NativeTypedArrayOfInt {
     static new(length) {
       return NativeUint8List._create1(_checkLength(length));
@@ -1263,6 +1274,7 @@ dart.library('dart/_native_typed_data', null, /* Imports */[
     names: ['_create1', '_create2', '_create3']
   });
   dart.defineExtensionMembers(NativeUint8List, ['get', 'sublist', 'length']);
+  NativeUint8List[dart.metadata] = () => [dart.const(new _js_helper.Native("Uint8Array,!nonleaf"))];
   class NativeFloat32x4 extends core.Object {
     static _truncate(x) {
       NativeFloat32x4._list.set(0, dart.as(x, core.num));
diff --git a/lib/runtime/dart/async.js b/lib/runtime/dart/async.js
index b643ab70..7c4bcfe4 100644
--- a/lib/runtime/dart/async.js
+++ b/lib/runtime/dart/async.js
@@ -1791,6 +1791,7 @@ dart.library('dart/async', null, /* Imports */[
     constructors: () => ({DeferredLibrary: [DeferredLibrary, [core.String], {uri: core.String}]}),
     methods: () => ({load: [Future$(core.Null), []]})
   });
+  DeferredLibrary[dart.metadata] = () => [dart.const(new core.Deprecated("Dart sdk v. 1.8"))];
   let _s = Symbol('_s');
   class DeferredLoadException extends core.Object {
     DeferredLoadException(s) {
diff --git a/lib/runtime/dart_runtime.js b/lib/runtime/dart_runtime.js
index ac24ada7..edf20639 100644
--- a/lib/runtime/dart_runtime.js
+++ b/lib/runtime/dart_runtime.js
@@ -876,6 +876,7 @@ var dart, dartx;
   /** The Symbol for storing type arguments on a specialized generic type. */
   dart.mixins = Symbol('mixins');
   dart.implements = Symbol('implements');
+  dart.metadata = Symbol('metadata');
 
   /**
    * Returns a new type that mixes members from base and all mixins.
diff --git a/lib/src/codegen/js_codegen.dart b/lib/src/codegen/js_codegen.dart
index 28ba34dc..62a5a011 100644
--- a/lib/src/codegen/js_codegen.dart
+++ b/lib/src/codegen/js_codegen.dart
@@ -363,8 +363,8 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
       jsPeerName = getConstantField(jsPeer, 'name', types.stringType);
     }
 
-    var body = _finishClassMembers(
-        classElem, classExpr, ctors, fields, methods, jsPeerName);
+    var body = _finishClassMembers(classElem, classExpr, ctors, fields, methods,
+        node.metadata, jsPeerName);
 
     var result = _finishClassDef(type, body);
 
@@ -541,13 +541,23 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
         [_emitMemberName('iterator', type: t)]));
   }
 
+  JS.Expression _instantiateAnnotation(Annotation node) {
+    var element = node.element;
+    if (element is ConstructorElement) {
+      return _emitInstanceCreationExpression(element, element.returnType,
+          node.constructorName, node.arguments, true);
+    } else {
+      return _visit(node.name);
+    }
+  }
+
   /// Emit class members that need to come after the class declaration, such
   /// as static fields. See [_emitClassMethods] for things that are emitted
   /// inside the ES6 `class { ... }` node.
   JS.Statement _finishClassMembers(ClassElement classElem,
       JS.ClassExpression cls, List<ConstructorDeclaration> ctors,
       List<FieldDeclaration> fields, List<MethodDeclaration> methods,
-      String jsPeerName) {
+      List<Annotation> metadata, String jsPeerName) {
     var name = classElem.name;
     var body = <JS.Statement>[];
 
@@ -627,6 +637,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
           }
         }
       }
+
       var tCtors = [];
       for (ConstructorDeclaration node in ctors) {
         var memberName = _constructorName(node.element);
@@ -637,6 +648,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
             new JS.Property(memberName, new JS.ArrayInitializer(parts));
         tCtors.add(property);
       }
+
       build(name, elements) {
         var o =
             new JS.ObjectInitializer(elements, multiline: elements.length > 1);
@@ -675,6 +687,14 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
       ]));
     }
 
+    // Metadata
+    if (metadata.isNotEmpty) {
+      body.add(js.statement('#[dart.metadata] = () => #;', [
+        name,
+        new JS.ArrayInitializer(metadata.map(_instantiateAnnotation).toList())
+      ]));
+    }
+
     return _statement(body);
   }
 
@@ -1743,11 +1763,10 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
     _properties.clear();
   }
 
-  @override
-  visitConstructorName(ConstructorName node) {
-    var typeName = _visit(node.type);
-    var element = node.staticElement;
-    if (node.name != null || element.isFactory) {
+  JS.Expression _emitConstructorName(
+      ConstructorElement element, DartType type, SimpleIdentifier name) {
+    var typeName = _emitTypeName(type);
+    if (name != null || element.isFactory) {
       var namedCtor = _constructorName(element);
       return new JS.PropertyAccess(typeName, namedCtor);
     }
@@ -1755,30 +1774,45 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
   }
 
   @override
-  visitInstanceCreationExpression(InstanceCreationExpression node) {
+  visitConstructorName(ConstructorName node) {
+    return _emitConstructorName(node.staticElement, node.type.type, node.name);
+  }
+
+  JS.Expression _emitInstanceCreationExpression(ConstructorElement element,
+      DartType type, SimpleIdentifier name, ArgumentList argumentList,
+      bool isConst) {
     emitNew() {
       JS.Expression ctor;
       bool isFactory = false;
-      var element = node.staticElement;
+      // var element = node.staticElement;
       if (element == null) {
         // TODO(jmesserly): this only happens if we had a static error.
         // Should we generate a throw instead?
-        ctor = _visit(node.constructorName.type);
-        var ctorName = node.constructorName.name;
-        if (ctorName != null) {
-          ctor = new JS.PropertyAccess(ctor, _propertyName(ctorName.name));
+        ctor = _emitTypeName(type);
+        if (name != null) {
+          ctor = new JS.PropertyAccess(ctor, _propertyName(name.name));
         }
       } else {
-        ctor = _visit(node.constructorName);
+        ctor = _emitConstructorName(element, type, name);
         isFactory = element.isFactory;
       }
-      var args = _visit(node.argumentList);
+      var args = _visit(argumentList);
       return isFactory ? new JS.Call(ctor, args) : new JS.New(ctor, args);
     }
-    if (node.isConst) return _emitConst(node, emitNew);
+    if (isConst) return _emitConst(emitNew);
     return emitNew();
   }
 
+  @override
+  visitInstanceCreationExpression(InstanceCreationExpression node) {
+    var element = node.staticElement;
+    var constructor = node.constructorName;
+    var name = constructor.name;
+    var type = constructor.type.type;
+    return _emitInstanceCreationExpression(
+        element, type, name, node.argumentList, node.isConst);
+  }
+
   /// True if this type is built-in to JS, and we use the values unwrapped.
   /// For these types we generate a calling convention via static
   /// "extension methods". This allows types to be extended without adding
@@ -1876,6 +1910,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
     var op = node.operator;
     var left = node.leftOperand;
     var right = node.rightOperand;
+
     var leftType = getStaticType(left);
     var rightType = getStaticType(right);
 
@@ -1945,7 +1980,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
     return id;
   }
 
-  JS.Expression _emitConst(Expression node, JS.Expression expr()) {
+  JS.Expression _emitConst(JS.Expression expr()) {
     // TODO(jmesserly): emit the constants at top level if possible.
     // This wasn't quite working, so disabled for now.
     return js.call('dart.const(#)', expr());
@@ -2436,7 +2471,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
       var name = js.string(node.components.join('.'), "'");
       return new JS.New(_emitTypeName(types.symbolType), [name]);
     }
-    return _emitConst(node, emitSymbol);
+    return _emitConst(emitSymbol);
   }
 
   @override
@@ -2450,7 +2485,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
       }
       return list;
     }
-    if (node.constKeyword != null) return _emitConst(node, emitList);
+    if (node.constKeyword != null) return _emitConst(emitList);
     return emitList();
   }
 
@@ -2482,7 +2517,7 @@ class JSCodegenVisitor extends GeneralizingAstVisitor {
       // TODO(jmesserly): add generic types args.
       return js.call('dart.map(#)', [mapArguments]);
     }
-    if (node.constKeyword != null) return _emitConst(node, emitMap);
+    if (node.constKeyword != null) return _emitConst(emitMap);
     return emitMap();
   }