EventEmitter.js

EventEmitter.js

export class EventEmitter {
  listeners = new Map();

  on(eventName, cb) {
    if (!this.listeners.has(eventName)) {
      this.listeners.set(eventName, new Set([]));
    }

    this.listeners.get(eventName)?.add(cb);
  }

  off(eventName, cb) {
    if (this.listeners.has(eventName)) {
      this.listeners.get(eventName)?.delete(cb);
    }
  }

  trigger(eventName, data) {
    this.listeners.get(eventName)?.forEach((el) => {
      try {
        el(data);
      } catch (e) {}
    });
  }
}