如何将 Expressjs 箭头函数从 JavaScript 转换为 TypeScript

Question

我正在将 Expressjs 项目从 JavaScript 转换为 TypeScript。

初始 JavaScript 模块catchAsyncError.js：

module.exports = theFunc => (req, res, next) => {
    Promise.resolve(theFunc(req, res, next)).catch(next);
}

我尝试转换为 TypeScriptcatchAsyncError.ts：

import { Request, Response, NextFunction} from "express";

const theFunc => (req: Request, res: Response, next: NextFunction) => {
    Promise.resolve(theFunc(req, res, next)).catch(next);
}
export default theFunc;

但是有一个错误：变量 'theFunc' 隐式具有 'any' 类型.ts(7005)

有人可以建议和解释吗？提前致谢。

Answer 1

参考cmgchess给出的链接， Typescript: TS7006: Parameter 'xxx' implicitly has an 'any' type

我设法隐藏了它：

catchAsyncError.ts

import { Request, Response, NextFunction} from "express";


const catchAsyncError = (theFunc: any) => (req: Request, res: Response, next: NextFunction) => {
    Promise.resolve(theFunc(req, res, next)).catch(next);
}

export default catchAsyncError;

感谢大家的宝贵时间！

Answer 2

我认为您需要在函数定义中将 => 替换为 =：

//   see here \/
const theFunc = (req: Request, res: Response, next: NextFunction) => {
    Promise.resolve(theFunc(req, res, next)).catch(next);
}