Function runInInjectionContext

packages/core/src/di/contextual.ts:37–59

(injector: Injector, fn: () => ReturnT)

 * @publicApi
 */
export function runInInjectionContext<ReturnT>(injector: Injector, fn: () => ReturnT): ReturnT {
  let internalInjector: PrimitivesInjector;
  if (injector instanceof R3Injector) {
    assertNotDestroyed(injector);
    internalInjector = injector;
  } else {
    internalInjector = new RetrievingInjector(injector);
  }

  let prevInjectorProfilerContext: InjectorProfilerContext;
  if (ngDevMode) {
    prevInjectorProfilerContext = setInjectorProfilerContext({injector, token: null});
  }
  const prevInjector = setCurrentInjector(internalInjector);
  const previousInjectImplementation = setInjectImplementation(undefined);
  try {
    return fn();
  } finally {
    setCurrentInjector(prevInjector);
    ngDevMode && setInjectorProfilerContext(prevInjectorProfilerContext!);
    setInjectImplementation(previousInjectImplementation);
  }
}

/**
 * Whether the current stack frame is inside an injection context.