Method lifeCycleObserver

packages/core/src/application.ts:503–516

* Register a life cycle observer class * @param ctor - A class implements LifeCycleObserver * @param nameOrOptions - Optional name or options for the life cycle observer

(
    ctor: Constructor<T>,
    nameOrOptions?: string | BindingFromClassOptions,
  )

   * @param nameOrOptions - Optional name or options for the life cycle observer
   */
  public lifeCycleObserver<T extends LifeCycleObserver>(
    ctor: Constructor<T>,
    nameOrOptions?: string | BindingFromClassOptions,
  ): Binding<T> {
    this.debug('Adding life cycle observer %s', nameOrOptions ?? ctor.name);
    const binding = createBindingFromClass(ctor, {
      namespace: CoreBindings.LIFE_CYCLE_OBSERVERS,
      type: CoreTags.LIFE_CYCLE_OBSERVER,
      defaultScope: BindingScope.SINGLETON,
      ...toOptions(nameOrOptions),
    }).apply(asLifeCycleObserver);
    this.add(binding);
    return binding;
  }

  /**
   * Add a service to this application.