type Callback = (data: unknown) => void;

const events: Record<string, Callback[]> = {};

export const EventBus = {
  on(event: string, callback: Callback) {
    if (!events[event]) events[event] = [];
    events[event].push(callback);
  },
  off(event: string, callback: Callback) {
    events[event] = events[event]?.filter((cb) => cb !== callback) || [];
  },
  emit(event: string, data?: unknown) {
    events[event]?.forEach((cb) => cb(data));
  },
};