eslint配置代码自动格式化 及常用规则说明_eslint格式化

1.打开vue项目的.eslintrc.js 复制以下代码到项目中

module.exports = {
  root: true,
  parserOptions: {
    parser: 'babel-eslint',
    sourceType: 'module'
  },
  env: {
    browser: true,
    node: true,
    es6: true
  },
  extends: ['plugin:vue/recommended', 'eslint:recommended'],
  rules: {
    'vue/max-attributes-per-line': [
      2,
      {
        singleline: 10,
        multiline: {
          max: 1,
          allowFirstLine: false
        }
      }
    ],
    'vue/singleline-html-element-content-newline': 'off',
    'vue/multiline-html-element-content-newline': 'off',
    'vue/name-property-casing': ['error', 'PascalCase'],
    'vue/no-v-html': 'off',
    'accessor-pairs': 2,
    'arrow-spacing': [
      2,
      {
        before: true,
        after: true
      }
    ],
    'block-spacing': [2, 'always'],
    'brace-style': [
      2,
      '1tbs',
      {
        allowSingleLine: true
      }
    ],
    camelcase: [
      0,
      {
        properties: 'always'
      }
    ],
    'comma-dangle': [2, 'never'],
    'comma-spacing': [
      2,
      {
        before: false,
        after: true
      }
    ],
    'comma-style': [2, 'last'],
    'constructor-super': 2,
    curly: [2, 'multi-line'],
    'dot-location': [2, 'property'],
    'eol-last': 2,
    eqeqeq: ['error', 'always', { null: 'ignore' }],
    'generator-star-spacing': [
      2,
      {
        before: true,
        after: true
      }
    ],
    'handle-callback-err': [2, '^(err|error)$'],
    indent: [
      2,
      2,
      {
        SwitchCase: 1
      }
    ],
    'jsx-quotes': [2, 'prefer-single'],
    'key-spacing': [
      2,
      {
        beforeColon: false,
        afterColon: true
      }
    ],
    'keyword-spacing': [
      2,
      {
        before: true,
        after: true
      }
    ],
    'new-cap': [
      2,
      {
        newIsCap: true,
        capIsNew: false
      }
    ],
    'new-parens': 2,
    'no-array-constructor': 2,
    'no-caller': 2,
    'no-console': 'off',
    'no-class-assign': 2,
    'no-cond-assign': 2,
    'no-const-assign': 2,
    'no-control-regex': 0,
    'no-delete-var': 2,
    'no-dupe-args': 2,
    'no-dupe-class-members': 2,
    'no-dupe-keys': 2,
    'no-duplicate-case': 2,
    'no-empty-character-class': 2,
    'no-empty-pattern': 2,
    'no-eval': 2,
    'no-ex-assign': 2,
    'no-extend-native': 2,
    'no-extra-bind': 2,
    'no-extra-boolean-cast': 2,
    'no-extra-parens': [2, 'functions'],
    'no-fallthrough': 2,
    'no-floating-decimal': 2,
    'no-func-assign': 2,
    'no-implied-eval': 2,
    'no-inner-declarations': [2, 'functions'],
    'no-invalid-regexp': 2,
    'no-irregular-whitespace': 2,
    'no-iterator': 2,
    'no-label-var': 2,
    'no-labels': [
      2,
      {
        allowLoop: false,
        allowSwitch: false
      }
    ],
    'no-lone-blocks': 2,
    'no-mixed-spaces-and-tabs': 2,
    'no-multi-spaces': 2,
    'no-multi-str': 2,
    'no-multiple-empty-lines': [
      2,
      {
        max: 1
      }
    ],
    'no-native-reassign': 2,
    'no-negated-in-lhs': 2,
    'no-new-object': 2,
    'no-new-require': 2,
    'no-new-symbol': 2,
    'no-new-wrappers': 2,
    'no-obj-calls': 2,
    'no-octal': 2,
    'no-octal-escape': 2,
    'no-path-concat': 2,
    'no-proto': 2,
    'no-redeclare': 2,
    'no-regex-spaces': 2,
    'no-return-assign': [2, 'except-parens'],
    'no-self-assign': 2,
    'no-self-compare': 2,
    'no-sequences': 2,
    'no-shadow-restricted-names': 2,
    'no-spaced-func': 2,
    'no-sparse-arrays': 2,
    'no-this-before-super': 2,
    'no-throw-literal': 2,
    'no-trailing-spaces': 2,
    'no-undef': 2,
    'no-undef-init': 2,
    'no-unexpected-multiline': 2,
    'no-unmodified-loop-condition': 2,
    'no-unneeded-ternary': [
      2,
      {
        defaultAssignment: false
      }
    ],
    'no-unreachable': 2,
    'no-unsafe-finally': 2,
    'no-unused-vars': [
      2,
      {
        vars: 'all',
        args: 'none'
      }
    ],
    'no-useless-call': 2,
    'no-useless-computed-key': 2,
    'no-useless-constructor': 2,
    'no-useless-escape': 0,
    'no-whitespace-before-property': 2,
    'no-with': 2,
    'one-var': [
      2,
      {
        initialized: 'never'
      }
    ],
    'operator-linebreak': [
      2,
      'after',
      {
        overrides: {
          '?': 'before',
          ':': 'before'
        }
      }
    ],
    'padded-blocks': [2, 'never'],
    quotes: [
      2,
      'single',
      {
        avoidEscape: true,
        allowTemplateLiterals: true
      }
    ],
    semi: [2, 'never'],
    'semi-spacing': [
      2,
      {
        before: false,
        after: true
      }
    ],
    'space-before-blocks': [2, 'always'],
    'space-before-function-paren': [2, 'never'],
    'space-in-parens': [2, 'never'],
    'space-infix-ops': 2,
    'space-unary-ops': [
      2,
      {
        words: true,
        nonwords: false
      }
    ],
    'spaced-comment': [
      2,
      'always',
      {
        markers: ['global', 'globals', 'eslint', 'eslint-disable', '*package', '!', ',']
      }
    ],
    'template-curly-spacing': [2, 'never'],
    'use-isnan': 2,
    'valid-typeof': 2,
    'wrap-iife': [2, 'any'],
    'yield-star-spacing': [2, 'both'],
    yoda: [2, 'never'],
    'prefer-const': 2,
    'no-debugger': process.env.NODE_ENV === 'production' ? 2 : 0,
    'object-curly-spacing': [
      2,
      'always',
      {
        objectsInObjects: false
      }
    ],
    'array-bracket-spacing': [2, 'never']
  }
}

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0 代表关闭 1 代表警告 2 代表开启
allowFirstLine: false报错的解决方式
配置过期 eslint-plugin-vue 规则导致 eslint 失效原因定位
Parsing error: Cannot find module ‘babel-eslint‘解决方法

对这个版本的进行配置"@babel/eslint-parser": “^7.12.16”,
“eslint”: “^7.32.0”,

// module.exports = {
//   root: true,
//   env: {
//     node: true
//   },
//   extends: [
//     'plugin:vue/essential',
//     '@vue/standard'
//   ],
//   parserOptions: {
//     parser: '@babel/eslint-parser'
//   },
//   rules: {
//     'no-console': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
//     'no-debugger': process.env.NODE_ENV === 'production' ? 'warn' : 'off'
//   }
// }
module.exports = {
  root: true,
  parserOptions: {
    parser: '@babel/eslint-parser',
    sourceType: 'module'
  },
  env: {
    browser: true,
    node: true,
    es6: true
  },
  extends: ['plugin:vue/recommended', 'eslint:recommended'],
  rules: {
    // 强制第一个属性的位置(属性换行)
    'vue/first-attribute-linebreak': [
      2,
      {
        // 单行时，第一属性前不允许使用换行符
        singleline: 'beside',
        // 多行时，第一属性前必须使用换行符
        multiline: 'below'
      }
    ],
    // 强制每行的最大属性数
    'vue/max-attributes-per-line': [
      2,
      {
        // 单行时可以接收最大数量
        singleline: 10,
        // 多行时可以接收最大数量
        multiline: {
          max: 1
        }
      }
    ],
    // 单标签的关闭配置
    'vue/html-self-closing': [
      'error',
      {
        html: {
          void: 'always',
          normal: 'never',
          component: 'always'
        },
        svg: 'always',
        math: 'always'
      }
    ],
    'vue/singleline-html-element-content-newline': 'off',
    'vue/multiline-html-element-content-newline': 'off',
    'vue/name-property-casing': ['error', 'PascalCase'],
    'vue/no-v-html': 'off',
    'accessor-pairs': 2,
    'arrow-spacing': [
      2,
      {
        before: true,
        after: true
      }
    ],
    'block-spacing': [2, 'always'],
    'brace-style': [
      2,
      '1tbs',
      {
        allowSingleLine: true
      }
    ],
    camelcase: [
      0,
      {
        properties: 'always'
      }
    ],
    'comma-dangle': [2, 'never'],
    'comma-spacing': [
      2,
      {
        before: false,
        after: true
      }
    ],
    'comma-style': [2, 'last'],
    'constructor-super': 2,
    curly: [2, 'multi-line'],
    'dot-location': [2, 'property'],
    'eol-last': 2,
    eqeqeq: ['error', 'always', { null: 'ignore' }],
    'generator-star-spacing': [
      2,
      {
        before: true,
        after: true
      }
    ],
    'handle-callback-err': [2, '^(err|error)$'],
    indent: [
      2,
      2,
      {
        SwitchCase: 1
      }
    ],
    'jsx-quotes': [2, 'prefer-single'],
    'key-spacing': [
      2,
      {
        beforeColon: false,
        afterColon: true
      }
    ],
    'keyword-spacing': [
      2,
      {
        before: true,
        after: true
      }
    ],
    'new-cap': [
      2,
      {
        newIsCap: true,
        capIsNew: false
      }
    ],
    'new-parens': 2,
    'no-array-constructor': 2,
    'no-caller': 2,
    'no-console': 'off',
    'no-class-assign': 2,
    'no-cond-assign': 2,
    'no-const-assign': 2,
    'no-control-regex': 0,
    'no-delete-var': 2,
    'no-dupe-args': 2,
    'no-dupe-class-members': 2,
    'no-dupe-keys': 2,
    'no-duplicate-case': 2,
    'no-empty-character-class': 2,
    'no-empty-pattern': 2,
    'no-eval': 2,
    'no-ex-assign': 2,
    'no-extend-native': 2,
    'no-extra-bind': 2,
    'no-extra-boolean-cast': 2,
    'no-extra-parens': [2, 'functions'],
    'no-fallthrough': 2,
    'no-floating-decimal': 2,
    'no-func-assign': 2,
    'no-implied-eval': 2,
    'no-inner-declarations': [2, 'functions'],
    'no-invalid-regexp': 2,
    'no-irregular-whitespace': 2,
    'no-iterator': 2,
    'no-label-var': 2,
    'no-labels': [
      2,
      {
        allowLoop: false,
        allowSwitch: false
      }
    ],
    'no-lone-blocks': 2,
    'no-mixed-spaces-and-tabs': 2,
    'no-multi-spaces': 2,
    'no-multi-str': 2,
    'no-multiple-empty-lines': [
      2,
      {
        max: 1
      }
    ],
    'no-native-reassign': 2,
    'no-negated-in-lhs': 2,
    'no-new-object': 2,
    'no-new-require': 2,
    'no-new-symbol': 2,
    'no-new-wrappers': 2,
    'no-obj-calls': 2,
    'no-octal': 2,
    'no-octal-escape': 2,
    'no-path-concat': 2,
    'no-proto': 2,
    'no-redeclare': 2,
    'no-regex-spaces': 2,
    'no-return-assign': [2, 'except-parens'],
    'no-self-assign': 2,
    'no-self-compare': 2,
    'no-sequences': 2,
    'no-shadow-restricted-names': 2,
    'no-spaced-func': 2,
    'no-sparse-arrays': 2,
    'no-this-before-super': 2,
    'no-throw-literal': 2,
    'no-trailing-spaces': 2,
    'no-undef': 2,
    'no-undef-init': 2,
    'no-unexpected-multiline': 2,
    'no-unmodified-loop-condition': 2,
    'no-unneeded-ternary': [
      2,
      {
        defaultAssignment: false
      }
    ],
    'no-unreachable': 2,
    'no-unsafe-finally': 2,
    'no-unused-vars': [
      2,
      {
        vars: 'all',
        args: 'none'
      }
    ],
    'no-useless-call': 2,
    'no-useless-computed-key': 2,
    'no-useless-constructor': 2,
    'no-useless-escape': 0,
    'no-whitespace-before-property': 2,
    'no-with': 2,
    'one-var': [
      2,
      {
        initialized: 'never'
      }
    ],
    'operator-linebreak': [
      2,
      'after',
      {
        overrides: {
          '?': 'before',
          ':': 'before'
        }
      }
    ],
    'padded-blocks': [2, 'never'],
    quotes: [
      2,
      'single',
      {
        avoidEscape: true,
        allowTemplateLiterals: true
      }
    ],
    semi: [2, 'never'],
    'semi-spacing': [
      2,
      {
        before: false,
        after: true
      }
    ],
    'space-before-blocks': [2, 'always'],
    'space-before-function-paren': [2, 'never'],
    'space-in-parens': [2, 'never'],
    'space-infix-ops': 2,
    'space-unary-ops': [
      2,
      {
        words: true,
        nonwords: false
      }
    ],
    'spaced-comment': [
      2,
      'always',
      {
        markers: ['global', 'globals', 'eslint', 'eslint-disable', '*package', '!', ',']
      }
    ],
    'template-curly-spacing': [2, 'never'],
    'use-isnan': 2,
    'valid-typeof': 2,
    'wrap-iife': [2, 'any'],
    'yield-star-spacing': [2, 'both'],
    yoda: [2, 'never'],
    'prefer-const': 2,
    'no-debugger': process.env.NODE_ENV === 'production' ? 2 : 0,
    'object-curly-spacing': [
      2,
      'always',
      {
        objectsInObjects: false
      }
    ],
    'array-bracket-spacing': [2, 'never']
  }
}


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2. 复制以下代码到该工作区的配置文件中

{ 
  "eslint.enable": true,
  "eslint.run": "onType",
  "eslint.options": {
      "extensions": [
          ".js",
          ".vue",
          ".jsx",
          ".tsx"
      ]
  },
  "editor.codeActionsOnSave": {
      "source.fixAll.eslint": true
  }
}

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常用规则说明: https://eslint.bootcss.com/docs/rules/