fix(ivy): should not throw when getting VCRef.parentInjector on the root view (#27909)

PR Close #27909

packages/core/src/render3/di.ts

@@ -208,7 +208,7 @@ export function getParentInjectorLocation(tNode: TNode, view: LView): RelativeIn
   let viewOffset = 1;
   while (hostTNode && hostTNode.injectorIndex === -1) {
     view = view[DECLARATION_VIEW] !;
-    hostTNode = view[HOST_NODE] !;
+    hostTNode = view ? view[HOST_NODE] : null;
     viewOffset++;
   }
 
@@ -292,9 +292,10 @@ export function injectAttributeImpl(tNode: TNode, attrNameToInject: string): str
  * @returns the value from the injector, `null` when not found, or `notFoundValue` if provided
  */
 export function getOrCreateInjectable<T>(
-    tNode: TElementNode | TContainerNode | TElementContainerNode, lView: LView,
+    tNode: TElementNode | TContainerNode | TElementContainerNode | null, lView: LView,
     token: Type<T>| InjectionToken<T>, flags: InjectFlags = InjectFlags.Default,
     notFoundValue?: any): T|null {
+  if (tNode) {
     const bloomHash = bloomHashBitOrFactory(token);
     // If the ID stored here is a function, this is a special object like ElementRef or TemplateRef
     // so just call the factory function to create it.
@@ -315,15 +316,17 @@ export function getOrCreateInjectable<T>(
     } else if (typeof bloomHash == 'number') {
       // If the token has a bloom hash, then it is a token which could be in NodeInjector.
 
-    // A reference to the previous injector TView that was found while climbing the element injector
-    // tree. This is used to know if viewProviders can be accessed on the current injector.
+      // A reference to the previous injector TView that was found while climbing the element
+      // injector tree. This is used to know if viewProviders can be accessed on the current
+      // injector.
       let previousTView: TView|null = null;
       let injectorIndex = getInjectorIndex(tNode, lView);
       let parentLocation: RelativeInjectorLocation = NO_PARENT_INJECTOR;
       let hostTElementNode: TNode|null =
           flags & InjectFlags.Host ? findComponentView(lView)[HOST_NODE] : null;
 
-    // If we should skip this injector, or if there is no injector on this node, start by searching
+      // If we should skip this injector, or if there is no injector on this node, start by
+      // searching
       // the parent injector.
       if (injectorIndex === -1 || flags & InjectFlags.SkipSelf) {
         parentLocation = injectorIndex === -1 ? getParentInjectorLocation(tNode, lView) :
@@ -371,6 +374,7 @@ export function getOrCreateInjectable<T>(
         }
       }
     }
+  }
 
   if (flags & InjectFlags.Optional && notFoundValue === undefined) {
     // This must be set or the NullInjector will throw for optional deps
@@ -570,7 +574,8 @@ export function injectInjector() {
 
 export class NodeInjector implements Injector {
   constructor(
-      private _tNode: TElementNode|TContainerNode|TElementContainerNode, private _lView: LView) {}
+      private _tNode: TElementNode|TContainerNode|TElementContainerNode|null,
+      private _lView: LView) {}
 
   get(token: any, notFoundValue?: any): any {
     return getOrCreateInjectable(this._tNode, this._lView, token, undefined, notFoundValue);

packages/core/src/render3/view_engine_compatibility.ts

@@ -190,7 +190,7 @@ export function createContainerRef(
         const parentTNode = getParentInjectorTNode(parentLocation, this._hostView, this._hostTNode);
 
         return !hasParentInjector(parentLocation) || parentTNode == null ?
-            new NullInjector() :
+            new NodeInjector(null, this._hostView) :
             new NodeInjector(parentTNode, parentView);
       }
 

packages/core/test/bundling/todo/bundle.golden_symbols.json

@@ -152,9 +152,6 @@
   {
     "name": "NodeInjectorFactory"
   },
-  {
-    "name": "NullInjector"
-  },
   {
     "name": "ObjectUnsubscribedErrorImpl"
   },
@@ -269,9 +266,6 @@
   {
     "name": "_DuplicateMap"
   },
-  {
-    "name": "_THROW_IF_NOT_FOUND"
-  },
   {
     "name": "__extends"
   },

packages/core/test/linker/view_injector_integration_spec.ts

@@ -758,16 +758,14 @@ class TestComp {
                     .toThrowError('NodeInjector: NOT_FOUND [SimpleDirective]');
               });
 
-      fixmeIvy('FW-638: Exception thrown when getting VCRef.parentInjector on the root view')
-          .it('should allow to use the NgModule injector from a root ViewContainerRef.parentInjector',
+      it('should allow to use the NgModule injector from a root ViewContainerRef.parentInjector',
          () => {
            @Component({template: ''})
            class MyComp {
              constructor(public vc: ViewContainerRef) {}
            }
 
-                const compFixture =
-                    TestBed
+           const compFixture = TestBed
                                    .configureTestingModule({
                                      declarations: [MyComp],
                                      providers: [{provide: 'someToken', useValue: 'someValue'}]
@@ -901,8 +899,7 @@ class TestComp {
             .toBe(el.children[0].nativeElement);
       });
 
-      fixmeIvy('FW-638: Exception thrown when getting VCRef.parentInjector on the root view')
-          .it('should inject ViewContainerRef', () => {
+      it('should inject ViewContainerRef', () => {
         @Component({template: ''})
         class TestComp {
           constructor(public vcr: ViewContainerRef) {}

packages/core/test/render3/view_container_ref_spec.ts

@@ -1926,6 +1926,8 @@ describe('ViewContainerRef', () => {
       }
 
       clear() { this._vcRef.clear(); }
+
+      getVCRefParentInjector() { return this._vcRef.parentInjector; }
     }
 
     // https://stackblitz.com/edit/angular-xxpffd?file=src%2Findex.html
@@ -1952,6 +1954,21 @@ describe('ViewContainerRef', () => {
       expect(fixture.outerHtml).toBe('<div host="mark"></div>');
     });
 
+    it('should allow getting the parentInjector of the VCRef which was injected into the root (bootstrapped) component',
+       () => {
+         const fixture = new ComponentFixture(AppCmpt, {
+           injector: {
+             get: (token: any) => {
+               if (token === 'foo') return 'bar';
+             }
+           }
+         });
+         expect(fixture.outerHtml).toBe('<div host="mark"></div>');
+
+         const parentInjector = fixture.component.getVCRefParentInjector();
+         expect(parentInjector.get('foo')).toEqual('bar');
+       });
+
     it('should check bindings for components dynamically created by root component', () => {
       class DynamicCompWithBindings {
         checkCount = 0;