Angular APP_INITIALIZER在成功时不会延迟引导

import { Injectable } from '@angular/core';

@Injectable()
export class AppConfig {
  initializeApp(): Promise<any> {
    return new Promise<any>((resolve, reject) => {
      // Perform initialization tasks here
      // e.g. load configuration data, fetch resources, etc.

      // Simulating an asynchronous operation
      setTimeout(() => {
        // Initialization completed successfully
        resolve();
      }, 2000);
    });
  }
}

export function initializeApp(appConfig: AppConfig) {
  return () => appConfig.initializeApp();
}

import { NgModule, APP_INITIALIZER } from '@angular/core';

import { AppConfig, initializeApp } from './app-config';

@NgModule({
  providers: [
    AppConfig,
    {
      provide: APP_INITIALIZER,
      useFactory: initializeApp,
      deps: [AppConfig],
      multi: true
    }
  ],
  bootstrap: [AppComponent]
})
export class AppModule { }