EventBus最简单实现

/* eslint-disable @typescript-eslint/ban-types */
class EventBus {
  private events: Map<string, Function[]>;

  constructor() {
    this.events = new Map();
  }

  on(eventName: string, fn: Function) {
    if (!eventName) {
      console.error('无效的事件名称');
      return false;
    }

    if (!(fn instanceof Function)) {
      console.error('无效的回调方法');
      return false;
    }

    const fns = this.events.get(eventName) || [];
    fns.push(fn);
    this.events.set(eventName, fns);
  }

  emit(eventName: string, ...args: any[]) {
    this.events.get(eventName)?.forEach((fn) => {
      fn(args);
    });
  }
}

export default new EventBus();