event bus for custom events and handlers

EventBus.js

class EventBus {
  static handlers = {};
  static on(eventName, handler, scope) {
    if (!EventBus.handlers[eventName]) {
      EventBus.handlers[eventName] = [];
    }

    EventBus.handlers[eventName].push({
      subscription: handler,
      scope,
    });
  }

  static fireEvent(eventName, ...args) {
    if (!EventBus.handlers[eventName]) {
      console.warn("Event is not registed.");
      return;
    }
    const handlers = EventBus.handlers[eventName];
    for (let { subscription, scope } of handlers) {
      scope = scope !== undefined ? scope : this;
      subscription.apply(scope, args);
    }
  }
}
export default EventBus;