/**
 * 表示一个异步函数类型.
 * const fetchData: AsyncFunction = async (url: string) => {};

// 用作参数类型
function executeAsync(fn: AsyncFunction) {
  return fn();
}
executeAsync(async ()=>{}) ✅ Correct
executeAsync(()=>{})❌ Error

// 限制返回值类型
function executeAsync(fn: AsyncFunction<boolean>) {
  return fn();
}
executeAsync(async ()=>true)✅ Correct
executeAsync(()=>true) ❌ Error
 */
type AsyncFunction<Returns = void | any> = (...args: any[]) => Promise<Returns>;

export type { AsyncFunction };