fix(dart/transform): Run DeferredRewriter in the correct phase

`DeferredRewriter` depends on the presence of `.ng_deps.dart` files,
which do not yet exist in the phase where it was previously run.

Update the transformer phases to fix this and add an integration test to
prevent regression.

Author: Tim Blasi

modules_dart/transform/lib/src/transform/transformer.dart

@@ -30,10 +30,11 @@ class AngularTransformerGroup extends TransformerGroup {
       [new DirectiveProcessor(options)]
     ];
     phases.addAll([
-      [new DeferredRewriter(options), new DirectiveMetadataLinker()],
+      [new DirectiveMetadataLinker()],
       [new BindGenerator(options)],
       [new TemplateCompiler(options)],
       [new StylesheetCompiler()],
+      [new DeferredRewriter(options)]
     ]);
     return new AngularTransformerGroup._(phases,
         formatCode: options.formatCode);

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

@@ -6,6 +6,7 @@ import 'package:code_transformers/tests.dart';
 import 'package:dart_style/dart_style.dart';
 
 import '../common/read_file.dart';
+import 'deferred_files/expected/output.dart' as deferredOuts;
 
 main() {
   allTests();
@@ -15,6 +16,21 @@ var formatter = new DartFormatter();
 var transform = new AngularTransformerGroup(
     new TransformerOptions(['web/index.dart'], formatCode: true));
 
+// Each test has its own directory for inputs & an `expected` directory for
+// expected outputs.
+//
+// In addition to these declared inputs, we inject a set of common inputs for
+// every test.
+const commonInputs = const {
+  'angular2|lib/src/core/metadata.dart': '../../../lib/src/core/metadata.dart',
+  'angular2|lib/src/core/application.dart': '../common/application.dart',
+  'angular2|lib/src/core/reflection/reflection_capabilities.dart':
+      '../common/reflection_capabilities.dart',
+  'angular2|lib/core.dart': '../../../lib/core.dart',
+  'angular2|lib/src/core/di/decorators.dart':
+      '../../../lib/src/core/di/decorators.dart',
+};
+
 class IntegrationTestConfig {
   final String name;
   final Map<String, String> assetPathToInputPath;
@@ -32,24 +48,6 @@ class IntegrationTestConfig {
 void allTests() {
   Html5LibDomAdapter.makeCurrent();
 
-  /*
-   * Each test has its own directory for inputs & an `expected` directory for
-   * expected outputs.
-   *
-   * In addition to these declared inputs, we inject a set of common inputs for
-   * every test.
-   */
-  var commonInputs = {
-    'angular2|lib/src/core/metadata.dart':
-        '../../../lib/src/core/metadata.dart',
-    'angular2|lib/src/core/application.dart': '../common/application.dart',
-    'angular2|lib/src/core/reflection/reflection_capabilities.dart':
-        '../common/reflection_capabilities.dart',
-    'angular2|lib/core.dart': '../../../lib/core.dart',
-    'angular2|lib/src/core/di/decorators.dart':
-        '../../../lib/src/core/di/decorators.dart',
-  };
-
   var tests = [
     new IntegrationTestConfig(
         'should generate proper code for a Component defining only a selector.',
@@ -162,10 +160,33 @@ void allTests() {
           config.assetPathToInputPath,
           config.assetPathToExpectedOutputPath,
           []);
-//,
-//          StringFormatter.noNewlinesOrSurroundingWhitespace);
     }
   }
+
+  _testDeferredRewriter();
+}
+
+void _testDeferredRewriter() {
+  var inputs = {
+    'a|web/bar.dart': 'deferred_files/bar.dart',
+    'a|web/index.dart': 'deferred_files/index.dart'
+  };
+  inputs.addAll(commonInputs);
+  inputs.keys.forEach((k) => inputs[k] = _readFile(inputs[k]));
+  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/index.dart': deferredOuts.indexContents
+  };
+  testPhases(
+      'should handle deferred imports in input files.',
+      [
+        [transform]
+      ],
+      inputs,
+      outputs,
+      []);
 }
 
 /// Smooths over differences in CWD between IDEs and running tests in Travis.

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

@@ -0,0 +1,17 @@
+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/bar.dart

@@ -0,0 +1,17 @@
+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/bar.ng_deps.dart

@@ -0,0 +1,24 @@
+library bar.ng_deps.dart;
+
+import 'bar.template.dart' as _templates;
+
+import 'bar.dart';
+import 'package:angular2/src/core/reflection/reflection.dart' as _ngRef;
+import 'package:angular2/src/core/metadata.dart';
+import 'package:angular2/src/core/metadata.ng_deps.dart' as i0;
+export 'bar.dart';
+
+var _visited = false;
+void initReflector() {
+  if (_visited) return;
+  _visited = true;
+  _ngRef.reflector
+    ..registerType(
+        MyComponent,
+        new _ngRef.ReflectionInfo(const [
+          const Component(selector: '[soup]'),
+          const View(template: ''),
+          _templates.HostMyComponentTemplate
+        ], const [], () => new MyComponent()));
+  i0.initReflector();
+}

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

@@ -0,0 +1,18 @@
+library angular2.test.transform.integration.deferred;
+
+// This stored as a constant because we need to be careful to avoid modifying
+// source lines for files we rewrite.
+// That is, we expect that modifications we make to input files do not change
+// line numbers, and storing this expected output as code would allow it to be
+// formatted, breaking our tests.
+const indexContents = '''
+library web_foo;
+
+import 'index.ng_deps.dart' as ngStaticInit;import 'bar.ng_deps.dart' deferred as bar;
+
+void main() {
+  bar.loadLibrary().then((_) {bar.initReflector();}).then((_) {
+    bar.execImmediate();
+  });
+}
+''';

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

@@ -0,0 +1,9 @@
+library web_foo;
+
+import 'bar.dart' deferred as bar;
+
+void main() {
+  bar.loadLibrary().then((_) {
+    bar.execImmediate();
+  });
+}