fix(core): WIP - support Attribute DI decorator in deps section o…

…f a token

Adding some random content to satisfy the 100 chars min length

packages/core/src/core_render3_private_export.ts

@@ -25,6 +25,7 @@ export {
   SWITCH_COMPILE_INJECTABLE__POST_R3__ as ɵSWITCH_COMPILE_INJECTABLE__POST_R3__,
 } from './di/injectable';
 export {INJECTOR_IMPL__POST_R3__ as ɵINJECTOR_IMPL__POST_R3__} from './di/injector';
+export {CREATE_ATTRIBUTE_DECORATOR__POST_R3__ as ɵCREATE_ATTRIBUTE_DECORATOR__POST_R3__} from './di/metadata';
 export {
   NG_INJ_DEF as ɵNG_INJ_DEF,
   NG_PROV_DEF as ɵNG_PROV_DEF,

packages/core/src/di/metadata.ts

@@ -7,7 +7,7 @@
  */
 
 import {makeParamDecorator} from '../util/decorators';
-
+import {ɵɵinjectAttribute} from '../render3/instructions/di';
 
 
 /**
@@ -277,11 +277,25 @@ export interface Attribute {
   attributeName?: string;
 }
 
+function CREATE_ATTRIBUTE_DECORATOR__PRE_R3__(): AttributeDecorator {
+  return makeParamDecorator(
+    'Attribute',
+    (attributeName?: string) => ({attributeName}));
+}
+
+export function CREATE_ATTRIBUTE_DECORATOR__POST_R3__(): AttributeDecorator {
+  return makeParamDecorator(
+    'Attribute',
+    (attributeName?: string) =>
+        ({attributeName, __NG_ELEMENT_ID__: () => ɵɵinjectAttribute(attributeName!)}));
+}
+
+const CREATE_ATTRIBUTE_DECORATOR_IMPL = CREATE_ATTRIBUTE_DECORATOR__PRE_R3__;
+
 /**
  * Attribute decorator and metadata.
  *
  * @Annotation
  * @publicApi
- */
-export const Attribute: AttributeDecorator =
-    makeParamDecorator('Attribute', (attributeName?: string) => ({attributeName}));
+*/
+export const Attribute: AttributeDecorator = CREATE_ATTRIBUTE_DECORATOR_IMPL();

packages/core/test/acceptance/di_spec.ts

@@ -1800,6 +1800,38 @@ describe('di', () => {
     });
   });
 
+  describe('attribute tokens', () => {
+    it('should be able to provide an attribute token', () => {
+      const TOKEN = new InjectionToken<string>('Some token');
+      function factory(token: string): string {
+        return token + ' with factory';
+      }
+      @Component({
+        selector: 'my-comp',
+        template: '...',
+        providers: [{
+          provide: TOKEN,
+          deps: [[new Attribute('token')]],
+          useFactory: factory,
+        }]
+      })
+      class MyComp {
+        constructor(@Inject(TOKEN) readonly token: string) {}
+      }
+
+      @Component({template: `<my-comp token='token'></my-comp>`})
+      class WrapperComp {
+        @ViewChild(MyComp) myComp!: MyComp;
+      }
+
+      TestBed.configureTestingModule({declarations: [MyComp, WrapperComp]});
+
+      const fixture = TestBed.createComponent(WrapperComp);
+      fixture.detectChanges();
+      expect(fixture.componentInstance.myComp.token).toBe('token with factory');
+    });
+  });
+
   it('should not cause cyclic dependency if same token is requested in deps with @SkipSelf', () => {
     @Component({
       selector: 'my-comp',