export function createPubSub() {
  const map = new Map<string, Array<(data: any) => void>>();

  return {
    emit(event: string, data: any) {
      map.get(event)?.forEach((handler) => handler(data));
    },
    on(event: string, listener: (data: any) => void) {
      map.set(event, [...(map.get(event) || []), listener]);
    },
    off(event: string, listener: (data: any) => void) {
      map.set(event, map.get(event)?.filter((l) => l !== listener) || []);
    },
  };
}