fix(dart/transform): Fix issue with deferred in .ng_deps

Fix an issue in the linking step which prevents libraries from being
imported as `deferred`.

modules_dart/transform/lib/src/transform/directive_metadata_linker/ng_deps_linker.dart

@@ -65,7 +65,9 @@ bool _isNotDartDirective(dynamic model) => !isDartCoreUri(model.uri);
 /// associated `.ng_deps.json` file, if one exists.
 Future<Map<String, String>> _processNgImports(NgDepsModel model,
     AssetReader reader, AssetId assetId, UrlResolver resolver) async {
-  final importsAndExports = new List.from(model.imports)..addAll(model.exports);
+  final importsAndExports =
+      new List.from(model.imports.where((i) => !i.isDeferred))
+        ..addAll(model.exports);
   final retVal = <String, String>{};
   final assetUri = toAssetUri(assetId);
   return Future

modules_dart/transform/test/transform/directive_metadata_linker/all_tests.dart

@@ -164,6 +164,24 @@ void allTests() {
       expect(linkedImport.isNgDeps).toBeTrue();
       expect(linkedImport.prefix.startsWith('i')).toBeTrue();
     });
+
+    it('should not chain `deferred` libraries.', () async {
+      fooNgMeta.ngDeps
+        ..libraryUri = 'test.foo'
+        ..imports.add(new ImportModel()
+          ..uri = 'bar.dart'
+          ..isDeferred = true
+          ..prefix = 'dep');
+      barNgMeta.ngDeps.libraryUri = 'test.bar';
+      updateReader();
+
+      var linked = (await _testLink(reader, fooAssetId)).ngDeps;
+      expect(linked).toBeNotNull();
+      var linkedImport = linked.imports.firstWhere(
+          (i) => i.uri.endsWith('bar.ng_deps.dart'),
+          orElse: () => null);
+      expect(linkedImport).toBeNull();
+    });
   });
 }
 

modules_dart/transform/test/transform/integration/all_tests.dart

@@ -179,6 +179,7 @@ void allTests() {
 void _testDeferredRewriter() {
   var inputs = {
     'a|web/bar.dart': 'deferred_files/bar.dart',
+    'a|web/dep.dart': 'deferred_files/dep.dart',
     'a|web/index.dart': 'deferred_files/index.dart'
   };
   inputs.addAll(commonInputs);
@@ -186,7 +187,7 @@ void _testDeferredRewriter() {
   var outputs = {
     'a|web/bar.ng_deps.dart':
         _readFile('deferred_files/expected/bar.ng_deps.dart'),
-    'a|web/bar.dart': _readFile('deferred_files/expected/bar.dart'),
+    'a|web/bar.dart': deferredOuts.barContents,
     'a|web/index.dart': deferredOuts.indexContents
   };
   testPhases(

modules_dart/transform/test/transform/integration/deferred_files/bar.dart

@@ -2,7 +2,7 @@ library bar;
 
 import 'package:angular2/src/core/metadata.dart';
 
-import 'deps/my_dep.dart' deferred as dep;
+import 'dep.dart' deferred as dep;
 
 @Component(selector: '[soup]')
 @View(template: '')

modules_dart/transform/test/transform/integration/deferred_files/dep.dart

@@ -0,0 +1,6 @@
+library dep;
+
+import 'package:angular2/src/core/metadata.dart';
+
+@Injectable()
+void doImmediateThing() {}

modules_dart/transform/test/transform/integration/deferred_files/expected/bar.dart

@@ -1,17 +0,0 @@
-library bar;
-
-import 'package:angular2/src/core/metadata.dart';
-
-import 'deps/my_dep.dart' deferred as dep;
-
-@Component(selector: '[soup]')
-@View(template: '')
-class MyComponent {
-  void doDeferredThing() {
-    dep.loadLibrary().then((_) {
-      dep.doImmediateThing();
-    });
-  }
-}
-
-void execImmediate() {}

modules_dart/transform/test/transform/integration/deferred_files/expected/output.dart

@@ -16,3 +16,23 @@ void main() {
   });
 }
 ''';
+
+const barContents = '''
+library bar;
+
+import 'package:angular2/src/core/metadata.dart';
+
+import 'dep.ng_deps.dart' deferred as dep;
+
+@Component(selector: '[soup]')
+@View(template: '')
+class MyComponent {
+  void doDeferredThing() {
+    dep.loadLibrary().then((_) {dep.initReflector();}).then((_) {
+      dep.doImmediateThing();
+    });
+  }
+}
+
+void execImmediate() {}
+''';