Method $broadcast

packages/common/upgrade/test/upgrade.spec.ts:54–66

(evt: string, ...args: any[])

  }

  $broadcast(evt: string, ...args: any[]) {
    if (this.events[evt]) {
      this.events[evt].forEach((fn) => {
        fn.apply(fn, args);
      });
    }
    return {
      defaultPrevented: false,
      preventDefault() {
        this.defaultPrevented = true;
      },
    };
  }

  $on(evt: string, fn: any) {
    this.events[evt] ||= [];