Method wrapper

packages/editor/src/plugin/emitter.ts:127–130

(...args: any[])

  once(type: string | number, listener: Listener, prepend = false): this {
    const wrapper = (...args: any[]) => {
      this.off(type, wrapper)
      listener(...args)
    }
    return this.on(type, wrapper, prepend)
  }
}