How to configure eslint for React development

This article mainly introduces the eslint configuration that is essential for React development. Now I will share it with you and give you a reference.

Introduction to Eslint

Eslint is a JavaScript verification tool. With it, your editor can perform some static error prompt functions like an IDE.

Install eslint

$ npm install eslint -g

Plug-ins that need to be installed for the project

1. "babel-eslint": "^8.0.3",

2. "eslint": "^4.13.1",

3. "eslint-plugin-react": "^7.5.1",

Configuration details

The following configuration covers most of the information needed by developers. The values ​​0, 1, and 2 in rules mean not to enable checks, warnings, and mistake. You can see that some of the values ​​below are 0. If you need to turn on the check, you can change it to 1 or 2.

module.exports = {
  "env": {
    "browser": true,
    "commonjs": true,
    "es6": true
  },
  "extends": "eslint:recommended",
  "globals": {
    "$": true,
    "process": true,
    "__dirname": true
  },
  "parser": "babel-eslint",
  "parserOptions": {
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true,
      "jsx": true
    },
    "sourceType": "module",
    "ecmaVersion": 7
  },
  "plugins": [
    "react"
  ],
  "rules": {
    "quotes": [2, "single"], //单引号
    "no-console": 0, //不禁用console
    "no-debugger": 2, //禁用debugger
    "no-var": 0, //对var警告
    "semi": 0, //不强制使用分号
    "no-irregular-whitespace": 0, //不规则的空白不允许
    "no-trailing-spaces": 1, //一行结束后面有空格就发出警告
    "eol-last": 0, //文件以单一的换行符结束
    "no-unused-vars": [2, {"vars": "all", "args": "after-used"}], //不能有声明后未被使用的变量或参数
    "no-underscore-dangle": 0, //标识符不能以_开头或结尾
    "no-alert": 2, //禁止使用alert confirm prompt
    "no-lone-blocks": 0, //禁止不必要的嵌套块
    "no-class-assign": 2, //禁止给类赋值
    "no-cond-assign": 2, //禁止在条件表达式中使用赋值语句
    "no-const-assign": 2, //禁止修改const声明的变量
    "no-delete-var": 2, //不能对var声明的变量使用delete操作符
    "no-dupe-keys": 2, //在创建对象字面量时不允许键重复
    "no-duplicate-case": 2, //switch中的case标签不能重复
    "no-dupe-args": 2, //函数参数不能重复
    "no-empty": 2, //块语句中的内容不能为空
    "no-func-assign": 2, //禁止重复的函数声明
    "no-invalid-this": 0, //禁止无效的this，只能用在构造器，类，对象字面量
    "no-redeclare": 2, //禁止重复声明变量
    "no-spaced-func": 2, //函数调用时 函数名与()之间不能有空格
    "no-this-before-super": 0, //在调用super()之前不能使用this或super
    "no-undef": 2, //不能有未定义的变量
    "no-use-before-define": 2, //未定义前不能使用
    "camelcase": 0, //强制驼峰法命名
    "jsx-quotes": [2, "prefer-double"], //强制在JSX属性（jsx-quotes）中一致使用双引号
    "react/display-name": 0, //防止在React组件定义中丢失displayName
    "react/forbid-prop-types": [2, {"forbid": ["any"]}], //禁止某些propTypes
    "react/jsx-boolean-value": 2, //在JSX中强制布尔属性符号
    "react/jsx-closing-bracket-location": 1, //在JSX中验证右括号位置
    "react/jsx-curly-spacing": [2, {"when": "never", "children": true}], //在JSX属性和表达式中加强或禁止大括号内的空格。
    "react/jsx-indent-props": [2, 4], //验证JSX中的props缩进
    "react/jsx-key": 2, //在数组或迭代器中验证JSX具有key属性
    "react/jsx-max-props-per-line": [1, {"maximum": 1}], // 限制JSX中单行上的props的最大数量
    "react/jsx-no-bind": 0, //JSX中不允许使用箭头函数和bind
    "react/jsx-no-duplicate-props": 2, //防止在JSX中重复的props
    "react/jsx-no-literals": 0, //防止使用未包装的JSX字符串
    "react/jsx-no-undef": 1, //在JSX中禁止未声明的变量
    "react/jsx-pascal-case": 0, //为用户定义的JSX组件强制使用PascalCase
    "react/jsx-sort-props": 2, //强化props按字母排序
    "react/jsx-uses-react": 1, //防止反应被错误地标记为未使用
    "react/jsx-uses-vars": 2, //防止在JSX中使用的变量被错误地标记为未使用
    "react/no-danger": 0, //防止使用危险的JSX属性
    "react/no-did-mount-set-state": 0, //防止在componentDidMount中使用setState
    "react/no-did-update-set-state": 1, //防止在componentDidUpdate中使用setState
    "react/no-direct-mutation-state": 2, //防止this.state的直接变异
    "react/no-multi-comp": 2, //防止每个文件有多个组件定义
    "react/no-set-state": 0, //防止使用setState
    "react/no-unknown-property": 2, //防止使用未知的DOM属性
    "react/prefer-es6-class": 2, //为React组件强制执行ES5或ES6类
    "react/prop-types": 0, //防止在React组件定义中丢失props验证
    "react/react-in-jsx-scope": 2, //使用JSX时防止丢失React
    "react/self-closing-comp": 0, //防止没有children的组件的额外结束标签
    "react/sort-comp": 2, //强制组件方法顺序
    "no-extra-boolean-cast": 0, //禁止不必要的bool转换
    "react/no-array-index-key": 0, //防止在数组中遍历中使用数组key做索引
    "react/no-deprecated": 1, //不使用弃用的方法
    "react/jsx-equals-spacing": 2, //在JSX属性中强制或禁止等号周围的空格
    "no-unreachable": 1, //不能有无法执行的代码
    "comma-dangle": 2, //对象字面量项尾不能有逗号
    "no-mixed-spaces-and-tabs": 0, //禁止混用tab和空格
    "prefer-arrow-callback": 0, //比较喜欢箭头回调
    "arrow-parens": 0, //箭头函数用小括号括起来
    "arrow-spacing": 0 //=>的前/后括号
  },
  "settings": {
    "import/ignore": [
      "node_modules"
    ]
  }
};

Oh, God, you still want to see more react checkers, then go to the eslint-plugin-react github documentation and translate it slowly.

Turn off eslint checking for some files

You don’t always want all files to have eslint checking turned on. Then, how to turn off eslint for individual js files is just A comment needs to be added at the top of the file.

/*eslint-disable*/
function test() {
  return true
}

Turn off eslint check for a certain line of js code

The act of closing the entire js file is a bit violent. Don’t worry, you can also turn off eslint for only a certain section of code. .

// eslint-disable-next-line
alert('foo')

eslint configuration file types

eslint configuration file types are not only js and json, but also include the following:

1. .eslintrc.js

2. .eslintrc.yaml

3. .eslintrc.yml

4. .eslintrc .json

5. .eslintrc

6. package.json

The above is what I compiled for you , I hope it will be helpful to everyone in the future.

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