feat(upgrade): support lazy-loading Angular module into AngularJS app

packages/upgrade/src/common/downgrade_component.ts

@@ -9,9 +9,14 @@
 import {ComponentFactory, ComponentFactoryResolver, Injector, Type} from '@angular/core';
 
 import * as angular from './angular1';
-import {$COMPILE, $INJECTOR, $PARSE, INJECTOR_KEY, REQUIRE_INJECTOR, REQUIRE_NG_MODEL} from './constants';
+import {$COMPILE, $INJECTOR, $PARSE, INJECTOR_KEY, LAZY_MODULE_REF, REQUIRE_INJECTOR, REQUIRE_NG_MODEL} from './constants';
 import {DowngradeComponentAdapter} from './downgrade_component_adapter';
-import {controllerKey, getComponentName} from './util';
+import {LazyModuleRef, controllerKey, getComponentName, isFunction} from './util';
+
+
+interface Thenable<T> {
+  then(callback: (value: T) => any): any;
+}
 
 let downgradeCount = 0;
 
@@ -50,6 +55,8 @@ let downgradeCount = 0;
  */
 export function downgradeComponent(info: {
   component: Type<any>;
+  /** @experimental */
+  propagateDigest?: boolean;
   /** @deprecated since v4. This parameter is no longer used */
   inputs?: string[];
   /** @deprecated since v4. This parameter is no longer used */
@@ -76,9 +83,14 @@ export function downgradeComponent(info: {
         // triggered by `UpgradeNg1ComponentAdapterBuilder`, before the Angular templates have
         // been compiled.
 
-        const parentInjector: Injector|ParentInjectorPromise =
-            required[0] || $injector.get(INJECTOR_KEY);
         const ngModel: angular.INgModelController = required[1];
+        let parentInjector: Injector|Thenable<Injector>|undefined = required[0];
+        let ranAsync = false;
+
+        if (!parentInjector) {
+          const lazyModuleRef = $injector.get(LAZY_MODULE_REF) as LazyModuleRef;
+          parentInjector = lazyModuleRef.injector || lazyModuleRef.promise;
+        }
 
         const downgradeFn = (injector: Injector) => {
           const componentFactoryResolver: ComponentFactoryResolver =
@@ -98,18 +110,26 @@ export function downgradeComponent(info: {
 
           const projectableNodes = facade.compileContents();
           facade.createComponent(projectableNodes);
-          facade.setupInputs();
+          facade.setupInputs(info.propagateDigest);
           facade.setupOutputs();
           facade.registerCleanup();
 
           injectorPromise.resolve(facade.getInjector());
+
+          if (ranAsync) {
+            // If this is run async, it is possible that it is not run inside a
+            // digest and initial input values will not be detected.
+            scope.$evalAsync(() => {});
+          }
         };
 
-        if (parentInjector instanceof ParentInjectorPromise) {
+        if (isThenable<Injector>(parentInjector)) {
           parentInjector.then(downgradeFn);
         } else {
           downgradeFn(parentInjector);
         }
+
+        ranAsync = true;
       }
     };
   };
@@ -155,3 +175,7 @@ class ParentInjectorPromise {
     this.callbacks.length = 0;
   }
 }
+
+function isThenable<T>(obj: object): obj is Thenable<T> {
+  return isFunction((obj as any).then);
+}