refactor(core): Cleanup circular dependency between ViewEngine and Ivy `ChangeDetectorRef`. (#39621)

`ChangeDetectorRef` is declared in ViewEngine but it sub-classed in Ivy. This creates a circular
dependency between ViewEngine `ChangeDetectorRef` which needs to declare `__NG_ELEMENT_ID__` and
ivy factory which needs to create it. The workaround used to be to pass the `ChangeDetectorRef`
through stack but that created a very convoluted code. This refactoring simply bundles the
two files together and removes the stack workaround making the code simpler to follow.

PR Close #39621

goldens/circular-deps/packages.json

@@ -146,8 +146,26 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts",
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
+    "packages/core/src/render3/interfaces/container.ts",
+    "packages/core/src/linker/view_ref.ts"
+  ],
+  [
+    "packages/core/src/application_ref.ts",
+    "packages/core/src/application_tokens.ts",
+    "packages/core/src/linker/component_factory.ts",
+    "packages/core/src/change_detection/change_detection.ts",
+    "packages/core/src/change_detection/change_detector_ref.ts",
+    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts",
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
+    "packages/core/src/render3/interfaces/container.ts",
     "packages/core/src/render3/interfaces/view.ts",
     "packages/core/src/di/injector.ts",
     "packages/core/src/di/r3_injector.ts",
@@ -160,8 +178,12 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts",
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
+    "packages/core/src/render3/interfaces/container.ts",
     "packages/core/src/render3/interfaces/view.ts",
     "packages/core/src/metadata.ts",
     "packages/core/src/di.ts",
@@ -181,20 +203,12 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/interfaces/node.ts",
-    "packages/core/src/render3/interfaces/view.ts",
+    "packages/core/src/render3/interfaces/renderer.ts",
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
     "packages/core/src/render3/interfaces/container.ts",
-    "packages/core/src/linker/view_ref.ts"
-  ],
-  [
-    "packages/core/src/application_ref.ts",
-    "packages/core/src/application_tokens.ts",
-    "packages/core/src/linker/component_factory.ts",
-    "packages/core/src/change_detection/change_detection.ts",
-    "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
-    "packages/core/src/render3/interfaces/node.ts",
     "packages/core/src/render3/interfaces/view.ts",
     "packages/core/src/render3/interfaces/definition.ts",
     "packages/core/src/core.ts",
@@ -216,6 +230,9 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
+    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts",
+    "packages/core/src/render/api.ts",
     "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/state.ts",
     "packages/core/src/render3/assert.ts",
@@ -228,7 +245,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts"
   ],
   [
@@ -237,7 +253,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/di/injector.ts",
@@ -251,7 +266,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/di.ts",
@@ -267,7 +281,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/di.ts",
@@ -282,7 +295,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/di.ts",
@@ -295,7 +307,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/instructions/shared.ts",
@@ -316,7 +327,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/instructions/shared.ts",
@@ -340,7 +350,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/instructions/shared.ts",
@@ -359,7 +368,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/instructions/shared.ts",
@@ -379,7 +387,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/instructions/shared.ts",
@@ -392,7 +399,6 @@
     "packages/core/src/linker/component_factory.ts",
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/instructions/shared.ts",
@@ -844,7 +850,6 @@
   [
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/linker/component_factory.ts"
@@ -852,7 +857,6 @@
   [
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/instructions/shared.ts",
@@ -864,7 +868,6 @@
   [
     "packages/core/src/change_detection/change_detection.ts",
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts",
     "packages/core/src/linker/view_container_ref.ts",
     "packages/core/src/render3/instructions/shared.ts",
@@ -877,19 +880,16 @@
   ],
   [
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts"
-  ],
-  [
-    "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/interfaces/node.ts",
-    "packages/core/src/render3/interfaces/view.ts",
+    "packages/core/src/render3/interfaces/renderer.ts",
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
     "packages/core/src/render3/interfaces/container.ts",
     "packages/core/src/linker/view_ref.ts"
   ],
   [
     "packages/core/src/change_detection/change_detector_ref.ts",
-    "packages/core/src/render3/view_engine_compatibility.ts",
     "packages/core/src/render3/view_ref.ts"
   ],
   [
@@ -998,31 +998,129 @@
     "packages/core/src/render3/view_engine_compatibility.ts"
   ],
   [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
     "packages/core/src/render3/interfaces/container.ts",
     "packages/core/src/render3/interfaces/node.ts",
-    "packages/core/src/render3/interfaces/view.ts"
+    "packages/core/src/render3/interfaces/renderer.ts"
   ],
   [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
     "packages/core/src/render3/interfaces/container.ts",
-    "packages/core/src/render3/interfaces/view.ts"
+    "packages/core/src/render3/interfaces/renderer.ts"
   ],
   [
-    "packages/core/src/render3/interfaces/definition.ts",
+    "packages/core/src/render/api.ts",
-    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
-    "packages/core/src/render3/interfaces/view.ts"
+    "packages/core/src/render3/interfaces/type_checks.ts",
-  ],
+    "packages/core/src/render3/interfaces/container.ts",
-  [
-    "packages/core/src/render3/interfaces/definition.ts",
-    "packages/core/src/render3/interfaces/view.ts"
-  ],
-  [
-    "packages/core/src/render3/interfaces/node.ts",
-    "packages/core/src/render3/interfaces/view.ts"
-  ],
-  [
-    "packages/core/src/render3/interfaces/node.ts",
     "packages/core/src/render3/interfaces/view.ts",
-    "packages/core/src/render3/interfaces/query.ts"
+    "packages/core/src/render3/interfaces/definition.ts",
+    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
+    "packages/core/src/render3/interfaces/container.ts",
+    "packages/core/src/render3/interfaces/view.ts",
+    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
+    "packages/core/src/render3/interfaces/container.ts",
+    "packages/core/src/render3/interfaces/view.ts",
+    "packages/core/src/render3/interfaces/query.ts",
+    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
+    "packages/core/src/render3/interfaces/container.ts",
+    "packages/core/src/render3/interfaces/view.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
+    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/interfaces/type_checks.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/state.ts",
+    "packages/core/src/render3/assert.ts",
+    "packages/core/src/render3/interfaces/injector.ts",
+    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/state.ts",
+    "packages/core/src/render3/assert.ts",
+    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/state.ts",
+    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/state.ts",
+    "packages/core/src/render3/util/view_utils.ts",
+    "packages/core/src/render3/interfaces/context.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/state.ts",
+    "packages/core/src/render3/util/view_utils.ts",
+    "packages/core/src/render3/interfaces/node.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render/api.ts",
+    "packages/core/src/render3/view_engine_compatibility.ts",
+    "packages/core/src/render3/state.ts",
+    "packages/core/src/render3/util/view_utils.ts",
+    "packages/core/src/render3/interfaces/renderer.ts"
+  ],
+  [
+    "packages/core/src/render3/interfaces/container.ts",
+    "packages/core/src/render3/interfaces/view.ts"
+  ],
+  [
+    "packages/core/src/render3/interfaces/definition.ts",
+    "packages/core/src/render3/interfaces/view.ts"
   ],
   [
     "packages/core/src/render3/interfaces/query.ts",

packages/core/src/change_detection/change_detector_ref.ts

@@ -6,7 +6,18 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {injectChangeDetectorRef as render3InjectChangeDetectorRef} from '../render3/view_engine_compatibility';
+import {TNode, TNodeType} from '../render3/interfaces/node';
+import {isComponentHost} from '../render3/interfaces/type_checks';
+import {DECLARATION_COMPONENT_VIEW, LView} from '../render3/interfaces/view';
+import {getCurrentTNode, getLView} from '../render3/state';
+import {getComponentLViewByIndex} from '../render3/util/view_utils';
+import {ViewRef as R3_ViewRef} from '../render3/view_ref';
+import {noop} from '../util/noop';
+
+export const SWITCH_CHANGE_DETECTOR_REF_FACTORY__POST_R3__ = injectChangeDetectorRef;
+const SWITCH_CHANGE_DETECTOR_REF_FACTORY__PRE_R3__ = noop;
+const SWITCH_CHANGE_DETECTOR_REF_FACTORY: typeof injectChangeDetectorRef =
+    SWITCH_CHANGE_DETECTOR_REF_FACTORY__PRE_R3__;
 
 /**
  * Base class that provides change detection functionality.
@@ -114,12 +125,38 @@ export abstract class ChangeDetectorRef {
    * @internal
    * @nocollapse
    */
-  static __NG_ELEMENT_ID__: () => ChangeDetectorRef = () => SWITCH_CHANGE_DETECTOR_REF_FACTORY();
+  static __NG_ELEMENT_ID__: () => ChangeDetectorRef = SWITCH_CHANGE_DETECTOR_REF_FACTORY;
 }
 
 
 
-export const SWITCH_CHANGE_DETECTOR_REF_FACTORY__POST_R3__ = render3InjectChangeDetectorRef;
+/** Returns a ChangeDetectorRef (a.k.a. a ViewRef) */
-const SWITCH_CHANGE_DETECTOR_REF_FACTORY__PRE_R3__ = (...args: any[]): any => {};
+export function injectChangeDetectorRef(isPipe = false): ChangeDetectorRef {
-const SWITCH_CHANGE_DETECTOR_REF_FACTORY: typeof render3InjectChangeDetectorRef =
+  return createViewRef(getCurrentTNode()!, getLView(), isPipe);
-    SWITCH_CHANGE_DETECTOR_REF_FACTORY__PRE_R3__;
+}
+
+/**
+ * Creates a ViewRef and stores it on the injector as ChangeDetectorRef (public alias).
+ *
+ * @param tNode The node that is requesting a ChangeDetectorRef
+ * @param lView The view to which the node belongs
+ * @param isPipe Whether the view is being injected into a pipe.
+ * @returns The ChangeDetectorRef to use
+ */
+function createViewRef(tNode: TNode, lView: LView, isPipe: boolean): ChangeDetectorRef {
+  // `isComponentView` will be true for Component and Directives (but not for Pipes).
+  // See https://github.com/angular/angular/pull/33072 for proper fix
+  const isComponentView = !isPipe && isComponentHost(tNode);
+  if (isComponentView) {
+    // The LView represents the location where the component is declared.
+    // Instead we want the LView for the component View and so we need to look it up.
+    const componentView = getComponentLViewByIndex(tNode.index, lView);  // look down
+    return new R3_ViewRef(componentView, componentView);
+  } else if (tNode.type & (TNodeType.AnyRNode | TNodeType.AnyContainer | TNodeType.Icu)) {
+    // The LView represents the location where the injection is requested from.
+    // We need to locate the containing LView (in case where the `lView` is an embedded view)
+    const hostComponentView = lView[DECLARATION_COMPONENT_VIEW];  // look up
+    return new R3_ViewRef(hostComponentView, lView);
+  }
+  return null!;
+}

packages/core/src/render3/view_engine_compatibility.ts

@@ -6,49 +6,15 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {ChangeDetectorRef as ViewEngine_ChangeDetectorRef} from '../change_detection/change_detector_ref';
 import {Renderer2} from '../render/api';
-import {TNode, TNodeType} from './interfaces/node';
 import {isProceduralRenderer} from './interfaces/renderer';
-import {isComponentHost, isLView} from './interfaces/type_checks';
+import {isLView} from './interfaces/type_checks';
-import {DECLARATION_COMPONENT_VIEW, LView, RENDERER} from './interfaces/view';
+import {LView, RENDERER} from './interfaces/view';
 import {getCurrentTNode, getLView} from './state';
 import {getComponentLViewByIndex} from './util/view_utils';
-import {ViewRef} from './view_ref';
 
 
 
-/** Returns a ChangeDetectorRef (a.k.a. a ViewRef) */
-export function injectChangeDetectorRef(isPipe = false): ViewEngine_ChangeDetectorRef {
-  return createViewRef(getCurrentTNode()!, getLView(), isPipe);
-}
-
-/**
- * Creates a ViewRef and stores it on the injector as ChangeDetectorRef (public alias).
- *
- * @param tNode The node that is requesting a ChangeDetectorRef
- * @param lView The view to which the node belongs
- * @param isPipe Whether the view is being injected into a pipe.
- * @returns The ChangeDetectorRef to use
- */
-function createViewRef(tNode: TNode, lView: LView, isPipe: boolean): ViewEngine_ChangeDetectorRef {
-  // `isComponentView` will be true for Component and Directives (but not for Pipes).
-  // See https://github.com/angular/angular/pull/33072 for proper fix
-  const isComponentView = !isPipe && isComponentHost(tNode);
-  if (isComponentView) {
-    // The LView represents the location where the component is declared.
-    // Instead we want the LView for the component View and so we need to look it up.
-    const componentView = getComponentLViewByIndex(tNode.index, lView);  // look down
-    return new ViewRef(componentView, componentView);
-  } else if (tNode.type & (TNodeType.AnyRNode | TNodeType.AnyContainer | TNodeType.Icu)) {
-    // The LView represents the location where the injection is requested from.
-    // We need to locate the containing LView (in case where the `lView` is an embedded view)
-    const hostComponentView = lView[DECLARATION_COMPONENT_VIEW];  // look up
-    return new ViewRef(hostComponentView, lView);
-  }
-  return null!;
-}
-
 /** Returns a Renderer2 (or throws when application was bootstrapped with Renderer3) */
 function getOrCreateRenderer2(view: LView): Renderer2 {
   const renderer = view[RENDERER];

packages/core/src/render3/view_engine_compatibility_prebound.ts

@@ -7,13 +7,12 @@
  */
 
 
-import {ChangeDetectorRef} from '../change_detection/change_detector_ref';
+import {ChangeDetectorRef, injectChangeDetectorRef} from '../change_detection/change_detector_ref';
 import {InjectFlags} from '../di/interface/injector';
 import {createTemplateRef, TemplateRef} from '../linker/template_ref';
 import {throwProviderNotFoundError} from './errors';
 import {TNode} from './interfaces/node';
 import {LView} from './interfaces/view';
-import {injectChangeDetectorRef} from './view_engine_compatibility';
 
 
 /**