ESLint检查TypeScript

对于typescript的lint来说，以前都是使用tslint的工具，之后tslint官方放弃维护也建议大家使用eslint+typescript来实现对代码的校验。

1. 初始化npm npm init --yes，安装eslint、typescript npm i eslint typescript --save-dev、初始化eslintnpx eslint --init
2. 选择完成配置

√ How would you like to use ESLint? · style       
√ What type of modules does your project use? · none
√ Which framework does your project use? · none
# 这里说是否要使用typescript选择yes
√ Does your project use TypeScript? · No / Yes
√ Where does your code run? · browser
√ How would you like to define a style for your project? · guide
√ Which style guide do you want to follow? · standard
√ What format do you want your config file to be in? · JavaScript
√ Would you like to install them now with npm? · Yes

3. .eslintrc.js中可以看到一个多出来的parser，这个是语法解析器。

// ts对于js有很多的语法，所以要指定一个解析器
parser: '@typescript-eslint/parser',

4. 在index.ts中编写错误代码

function foo(ms: string): void{
  console.log(msg);
}

foo('hello ts~')

5. 在命令行中运行npx eslint .\index.ts，可以看到报错信息。