Question

让我们假设我正在定义一个模块，我有一些像这样的函数定义：

export function bodyParser(options?:any): 
  (req: ExpressServerRequest, res: ExpressServerResponse, next) =>void;
export function errorHandler(opts?:any): 
  (req: ExpressServerRequest, res: ExpressServerResponse, next) =>void;
export function methodOverride(): 
  (req: ExpressServerRequest, res: ExpressServerResponse, next) =>void;
export function favicon(url: string, opts? ): 
  (req: ExpressServerRequest, res: ExpressServerResponse, next) =>void;
export function logger(type: string, opts? ): 
  (req: ExpressServerRequest, res: ExpressServerResponse, next) =>void;

我反复使用这种返回类型注释：

(req: ExpressServerRequest, res: ExpressServerResponse, next) =>void

有没有办法定义该类型，为其指定名称，只引用名称而不是重复同样的事情？

Answer 1

是的！您可以使用带有呼叫签名的接口：

interface MyCallSignature {
    (req: ExpressServerRequest, res: ExpressServerResponse, next): void;
}

现在您可以使用它：

export function bodyParser(options?: any): MyCallSignature

如何重构类型注释？

1 个答案: