Method start

packages/core/src/application.ts:355–367

* Start the application, and all of its registered observers. The application * state is checked to ensure the integrity of `start`. * * If the application is not initialized, it calls first `init()` to * initialize the application. This only happens if `start()` is called for * the f

()

   * If the application is already started, no operation is performed.
   */
  public async start(): Promise<void> {
    if (!this._initialized) await this.init();
    if (this._state === 'starting') return this.awaitState('started');
    this.assertNotInProcess('start');
    // No-op if it's started
    if (this._state === 'started') return;
    this.setState('starting');
    this.setupShutdown();

    const registry = await this.getLifeCycleObserverRegistry();
    await registry.start();
    this.setState('started');
  }

  /**
   * Register a function to be called when the application starts.