Method on

packages/cli/src/utils/devtoolsService.test.ts:29–34

(event: string, fn: Listener)

    }

    on(event: string, fn: Listener) {
      const fns = this.listeners.get(event) || [];
      fns.push(fn);
      this.listeners.set(event, fns);
      return this;
    }

    emit(event: string, ...args: unknown[]) {
      for (const fn of this.listeners.get(event) || []) {