Events

Events.ts

export class Events {
  static _Listeners = {
    count: 0,
    refs: {}
  };

  static addEventListener(eventName: string, callback: () => any) {
    Events._Listeners.count++;
    const eventId = "l" + Events._Listeners.count;
    Events._Listeners.refs[eventId] = {
      name: eventName,
      callback
    };
    return eventId;
  }

  static removeEventListener(id) {
    return delete Events._Listeners.refs[id];
  }

  static removeAllListeners() {
    let removeError = false;
    Object.keys(Events._Listeners.refs).forEach(_id => {
      const removed = delete Events._Listeners.refs[_id];
      removeError = !removeError ? !removed : removeError;
    });
    return !removeError;
  }

  static emit(eventName: string, data: any) {
    Object.keys(Events._Listeners.refs).forEach(_id => {
      if (
        Events._Listeners.refs[_id] &&
        eventName === Events._Listeners.refs[_id].name
      )
        Events._Listeners.refs[_id].callback(data);
    });
  }
}

// Sending Events
Events.emit('eventName', { hello: world })
Events.emit('eventName', true)
Events.emit('eventName', 1234)

// Handling Events
Events.addEventListener('evnetName', (e) => { console.log(e) })