ESLint：可组装的JavaScript和JSX检查工具

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

npx eslint --init

// 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)

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