ESLint：可组装的JavaScript和JSX检查工具

中文文档：https://cn.eslint.org/

安装

npm install --save-dev eslint @eslint/create-config 

初始化

npx eslint --init

检查文件

// src/index.js

function foo(a, b) {return a + b;}

function func() {console.log('Hello World');}

$ npx eslint src/index.js

src/index.js
  2:10  error  'foo' is defined but never used   no-unused-vars
  3:10  error  'func' is defined but never used  no-unused-vars

✖ 2 problems (2 errors, 0 warnings)

可以使用/* eslint-disable */来禁用部分代码的检查

// src/index.js
/* eslint-disable */
function foo(a, b) {return a + b;}
/* eslint-disable */
function func() {console.log('Hello World');}