Node.js 四个不同的函数签名，用一个父类型封装

我有四个不同的函数签名：

type BeforeHookCallbackMode = (h: IBeforeHook) => void;
type BeforeHookRegularMode = (h?: IBeforeHook) => Promise<any>;
type BeforeHookObservableMode = (h?: IBeforeHook) => Observable<any>;
type BeforeHookEEMode = (h?: IBeforeHook) => EventEmitter;

您要找的不是“父”类型，而是“联合”类型

---

类继承，而不是类型。好的，我想我必须使用接口，而不是类

function(fn : BeforeHookCallbackMode | BeforeHookRegularMode | BeforeHookObservableMode | BeforeHookEEMode) {


}

type BeforeHookMode = BeforeHookCallbackMode | 
  BeforeHookRegularMode | 
  BeforeHookObservableMode | 
  BeforeHookEEMode;

function (fn: BeforeHookMode) {