ImageData.data is a Uint8ClampedList

sdk/lib/html/html_common/conversions.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.
 
 
 // Conversions for IDBKey.
 //
 // Per http://www.w3.org/TR/IndexedDB/#key-construct
 //
 // "A value is said to be a valid key if it is one of the following types: Array
@@ skipping 333 matching lines @@
   // None of the native getters that return ImageData have the type ImageData
   // since that is incorrect for FireFox (which returns a plain Object).  So we
   // need something that tells the compiler that the ImageData class has been
   // instantiated.
   // TODO(sra): Remove this when all the ImageData returning APIs have been
   // annotated as returning the union ImageData + Object.
   JS('ImageData', '0');
 
   if (nativeImageData is ImageData) return nativeImageData;
 
-  // On Firefox the above test fails because imagedata is a plain object.
-  // So we create a _TypedImageData.
+  // On Firefox the above test fails because [nativeImageData] is a plain
+  // object.  So we create a _TypedImageData.
 
   return new _TypedImageData(
-      JS('var', '#.data', nativeImageData),
+      JS('Uint8ClampedList', '#.data', nativeImageData),
       JS('var', '#.height', nativeImageData),
       JS('var', '#.width', nativeImageData));
 }
 
 // We can get rid of this conversion if _TypedImageData implements the fields
 // with native names.
 convertDartToNative_ImageData(ImageData imageData) {
   if (imageData is _TypedImageData) {
     return JS('', '{data: #, height: #, width: #}',
         imageData.data, imageData.height, imageData.width);
@@ skipping 15 matching lines @@
 const String _serializedScriptValue =
     'num|String|bool|'
     'JSExtendableArray|=Object|'
     'Blob|File|ByteBuffer|TypedData'
     // TODO(sra): Add Date, RegExp.
     ;
 const annotation_Creates_SerializedScriptValue =
     const Creates(_serializedScriptValue);
 const annotation_Returns_SerializedScriptValue =
     const Returns(_serializedScriptValue);