feat(transformers): updated transformers

Author: vsavkin

modules/angular2/src/transform/common/directive_metadata_reader.dart

@@ -61,6 +61,7 @@ class _DirectiveMetadataVisitor extends Object
         hostProperties: {},
         hostAttributes: {},
         readAttributes: [],
+        exportAs: null,
         callOnDestroy: false,
         callOnChange: false,
         callOnCheck: false,
@@ -136,6 +137,9 @@ class _DirectiveMetadataVisitor extends Object
       case 'lifecycle':
         _populateLifecycle(node.expression);
         break;
+      case 'exportAs':
+        _populateExportAs(node.expression);
+        break;
     }
     return null;
   }
@@ -225,6 +229,11 @@ class _DirectiveMetadataVisitor extends Object
         hostAttributeValue, meta.hostAttributes, 'Directive#hostAttributes');
   }
 
+  void _populateExportAs(Expression exportAsValue) {
+    _checkMeta();
+    meta.exportAs = _expressionToString(exportAsValue, 'Directive#exportAs');
+  }
+
   void _populateLifecycle(Expression lifecycleValue) {
     _checkMeta();
     if (lifecycleValue is! ListLiteral) {

modules/angular2/test/transform/directive_metadata_extractor/all_tests.dart

@@ -67,6 +67,12 @@ void allTests() {
       expect(metadata.properties).toContain('key2: val2');
     });
 
+    it('should parse exportAs.', () async {
+      var metadata = await readMetadata('directive_metadata_extractor/'
+          'directive_metadata_files/directive_export_as.ng_deps.dart');
+      expect(metadata.exportAs).toEqual('exportAsName');
+    });
+
     it('should parse host listeners.', () async {
       var metadata = await readMetadata('directive_metadata_extractor/'
           'directive_metadata_files/host_listeners.ng_deps.dart');

modules/angular2/test/transform/directive_metadata_extractor/directive_metadata_files/directive_export_as.ng_deps.dart

@@ -0,0 +1,19 @@
+library examples.hello_world.index_common_dart.ng_deps.dart;
+
+import 'hello.dart';
+import 'package:angular2/angular2.dart'
+    show bootstrap, Component, Directive, View, NgElement, onChange, onDestroy, onInit, onCheck, onAllChangesDone;
+
+var _visited = false;
+void initReflector(reflector) {
+  if (_visited) return;
+  _visited = true;
+  reflector
+    ..registerType(HelloCmp, {
+      'factory': () => new HelloCmp(),
+      'parameters': const [const []],
+      'annotations': const [
+        const Directive(exportAs: 'exportAsName')
+      ]
+    });
+}

modules/angular2/test/transform/integration/simple_annotation_files/expected/bar.ng_meta.json

@@ -10,6 +10,7 @@
     "properties": [],
     "readAttributes": [],
     "type": 1,
+    "exportAs": null,
     "callOnDestroy": false,
     "callOnCheck": false,
     "callOnInit": false,