src/EventEmitter.js

/**
 * @class EventEmitter
 */
class EventEmitter {
  constructor() {
    this.events = {};
  }

  on(eventName, listener) {
    if (!this.events[eventName]) {
      this.events[eventName] = [];
    }
    this.events[eventName].push(listener);
  }

  emit(eventName, ...args) {
    if (this.events[eventName]) {
      this.events[eventName].forEach((listener) => {
        listener(...args);
      });
    }
  }
}
export { EventEmitter as default };