Function factory

packages/upgrade/src/common/src/downgrade_injectable.ts:76–89

($injector: IInjectorService)

 */
export function downgradeInjectable(token: any, downgradedModule: string = ''): Function {
  const factory = function ($injector: IInjectorService) {
    const injectorKey = `${INJECTOR_KEY}${downgradedModule}`;
    const injectableName = isFunction(token) ? getTypeName(token) : String(token);
    const attemptedAction = `instantiating injectable '${injectableName}'`;

    validateInjectionKey($injector, downgradedModule, injectorKey, attemptedAction);

    try {
      const injector: Injector = $injector.get(injectorKey);
      return injector.get(token);
    } catch (err) {
      throw new Error(`Error while ${attemptedAction}: ${(err as Error).message || err}`);
    }
  };
  (factory as any)['$inject'] = [$INJECTOR];

  return factory;