Method onStart

packages/core/src/application.ts:379–389

* Register a function to be called when the application starts. * * This is a shortcut for adding a binding for a LifeCycleObserver * implementing a `start()` method. * * @param fn The function to invoke, it can be synchronous (returning `void`) * or asynchronous (returning `Promis

(fn: () => ValueOrPromise<void>)

   * @returns The LifeCycleObserver binding created.
   */
  public onStart(fn: () => ValueOrPromise<void>): Binding<LifeCycleObserver> {
    const key = [
      CoreBindings.LIFE_CYCLE_OBSERVERS,
      fn.name || '<onStart>',
      generateUniqueId(),
    ].join('.');

    return this.bind<LifeCycleObserver>(key)
      .to({start: fn})
      .apply(asLifeCycleObserver);
  }

  /**
   * Stop the application instance and all of its registered observers. The