mmi-js/src/EventBus.js

Multi-Modal Input Library for voice, gesture, and traditional inputs.

class EventBus {
  constructor() {
    this.listeners = {};
  }

  on(event, callback) {
    if (!this.listeners[event]) this.listeners[event] = [];
    this.listeners[event].push(callback);
  }

  off(event, callback) {
    if (!this.listeners[event]) return;
    this.listeners[event] = this.listeners[event].filter(cb => cb !== callback);
  }

  emit(event, data) {
    if (this.listeners[event]) {
      this.listeners[event].forEach(cb => cb(data));
    }
  }
}

export default EventBus;