refactor(core): do not publish `ɵɵgetFactoryOf()` (#41040)

Previously, `ɵɵgetFactoryOf()` was "privately" published from
`@angular/core` since in the past it was assumed that this
might be an instruction generated by the compiler.

This is not currently the case, so this commit removes it from
the private exports and renames it to indicate that it is a local
helper function.

PR Close #41040

packages/core/src/core_render3_private_export.ts

@@ -145,7 +145,6 @@ export {
   ɵɵenableBindings,
   ɵɵFactoryDef,
   ɵɵgetCurrentView,
-  ɵɵgetFactoryOf,
   ɵɵgetInheritedFactory,
   ɵɵhostProperty,
   ɵɵi18n,

packages/core/src/render3/di.ts

@@ -698,40 +698,19 @@ export class NodeInjector implements Injector {
   }
 }
 
-/**
- * @codeGenApi
- */
-export function ɵɵgetFactoryOf<T>(type: Type<any>): FactoryFn<T>|null {
-  const typeAny = type as any;
-
-  if (isForwardRef(type)) {
-    return (() => {
-             const factory = ɵɵgetFactoryOf<T>(resolveForwardRef(typeAny));
-             return factory ? factory() : null;
-           }) as any;
-  }
-
-  let factory = getFactoryDef<T>(typeAny);
-  if (factory === null) {
-    const injectorDef = getInjectorDef<T>(typeAny);
-    factory = injectorDef && injectorDef.factory;
-  }
-  return factory || null;
-}
-
 /**
  * @codeGenApi
  */
 export function ɵɵgetInheritedFactory<T>(type: Type<any>): (type: Type<T>) => T {
   return noSideEffects(() => {
     const ownConstructor = type.prototype.constructor;
-    const ownFactory = ownConstructor[NG_FACTORY_DEF] || ɵɵgetFactoryOf(ownConstructor);
+    const ownFactory = ownConstructor[NG_FACTORY_DEF] || getFactoryOf(ownConstructor);
     const objectPrototype = Object.prototype;
     let parent = Object.getPrototypeOf(type.prototype).constructor;
 
     // Go up the prototype until we hit `Object`.
     while (parent && parent !== objectPrototype) {
-      const factory = parent[NG_FACTORY_DEF] || ɵɵgetFactoryOf(parent);
+      const factory = parent[NG_FACTORY_DEF] || getFactoryOf(parent);
 
       // If we hit something that has a factory and the factory isn't the same as the type,
       // we've found the inherited factory. Note the check that the factory isn't the type's
@@ -752,3 +731,21 @@ export function ɵɵgetInheritedFactory<T>(type: Type<any>): (type: Type<T>) =>
     return t => new t();
   });
 }
+
+function getFactoryOf<T>(type: Type<any>): FactoryFn<T>|null {
+  const typeAny = type as any;
+
+  if (isForwardRef(type)) {
+    return (() => {
+             const factory = getFactoryOf<T>(resolveForwardRef(typeAny));
+             return factory ? factory() : null;
+           }) as any;
+  }
+
+  let factory = getFactoryDef<T>(typeAny);
+  if (factory === null) {
+    const injectorDef = getInjectorDef<T>(typeAny);
+    factory = injectorDef && injectorDef.factory;
+  }
+  return factory || null;
+}

packages/core/src/render3/index.ts

@@ -16,7 +16,7 @@ import {getComponent, getDirectives, getHostElement, getRenderedText} from './ut
 
 export {NgModuleType} from '../metadata/ng_module_def';
 export {ComponentFactory, ComponentFactoryResolver, ComponentRef, injectComponentFactoryResolver} from './component_ref';
-export {ɵɵgetFactoryOf, ɵɵgetInheritedFactory} from './di';
+export {ɵɵgetInheritedFactory} from './di';
 export {getLocaleId, setLocaleId} from './i18n/i18n_locale_id';
 // clang-format off
 export {

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

@@ -1004,6 +1004,9 @@
   {
     "name": "getFactoryDef"
   },
+  {
+    "name": "getFactoryOf"
+  },
   {
     "name": "getFirstLContainer"
   },
@@ -1718,9 +1721,6 @@
   {
     "name": "ɵɵelementStart"
   },
-  {
-    "name": "ɵɵgetFactoryOf"
-  },
   {
     "name": "ɵɵgetInheritedFactory"
   },