module.exports = {
  extends: ['plugin:vue/recommended', 'eslint:recommended']
  //You can change it to extensions: ['plugin: Vue / essential ','eslint: recommended']
}

rules: {
    'no-console': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'warn' : 'off'
  }

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, //Using getter/setter in objects
    'arrow-spacing': [
      2,
      {
        before: true,
        after: true
      }
    ], //=>Parentheses before / after
    'block-spacing': [2, 'always'], //Block needs space
    // The {after if while function must be on the same line as if, java style.
    'brace-style': [
      2,
      '1tbs',
      {
        allowSingleLine: true
      }
    ],
    //Mandatory hump naming
    camelcase: [
      0,
      {
        properties: 'always'
      }
    ],
    // Array and object key value pair last comma, never parameter: cannot have comma at the end, always parameter: must have comma at the end,  
    // Always multiline: multiline mode must have comma, single line mode cannot have comma 
    'comma-dangle': [2, 'never'],
    // Control spaces before and after commas
    'comma-spacing': [
      2,
      {
        before: false,
        after: true
      }
    ],
    'comma-style': [2, 'last'], // Controls whether commas appear at the end of a line or at the beginning of a line
    // Forces the parent constructor to be called with super() in the subclass constructor, and the compiler of typeflip will also prompt
    'constructor-super': 2,
    curly: [2, 'multi-line'], // Enforce consistent bracket style for all control statements
    // Force the position of. In object.key. Parameters:  
    // Property, the '.' number should be on the same line as the property  
    // Object, the '.' number should be on the same line as the object name
    'dot-location': [2, 'property'],
    'eol-last': 2, // Force wrap at end of file
    eqeqeq: ['error', 'always', { null: 'ignore' }], // Use = = = instead==
    'generator-star-spacing': [
      2,
      {
        before: true,
        after: true
      }
    ], //Space before and after generator function *
    'handle-callback-err': [2, '^(err|error)$'], //nodejs processing error
    indent: [
      2,
      2,
      {
        SwitchCase: 1
      }
    ],  //Indent style 
    'jsx-quotes': [2, 'prefer-single'], // Use double or single quotes consistently in JSX properties
    //Spaces before and after colons in object literals
    'key-spacing': [
      2,
      {
        beforeColon: false,
        afterColon: true
      }
    ], 
    'keyword-spacing': [
      2,
      {
        before: true,
        after: true
      }
    ],
    //The function name must be called in new mode in upper case and in lower case without new mode in the first line
    'new-cap': [
      2,
      {
        newIsCap: true,
        capIsNew: false
      }
    ],
    'new-parens': 2, //new must be parenthesized
    'no-array-constructor': 2, //Array constructor prohibited
    'no-caller': 2, //Prohibit using arguments.caller or arguments.call
    'no-console': 'off', //Do not use console
    'no-class-assign': 2, //Prohibit assigning to class
    'no-cond-assign': 2, //Prohibit using assignment statements in conditional expressions
    'no-const-assign': 2, //Variables declared by const cannot be modified
    'no-control-regex': 0, //Prohibit using control characters in regular expressions
    'no-delete-var': 2, //You cannot use the delete operator on a var declared variable
    'no-dupe-args': 2, //Function arguments cannot be repeated
    'no-dupe-class-members': 2, //Duplicate declarations are not allowed in a class
    'no-dupe-keys': 2, //Key repetition {a:1,a:1} is not allowed when creating object literals
    'no-duplicate-case': 2, //case labels in switch cannot be duplicate
    'no-empty-character-class': 2, //[] content in regular expression cannot be empty
    'no-empty-pattern': 2, // Disable empty deconstruction mode
    'no-eval': 2, //No eval
    'no-ex-assign': 2, //Forbid the assignment of exception parameter in catch statement
    'no-extend-native': 2, //Disable extending native objects
    'no-extra-bind': 2, //Disable unnecessary function binding
    'no-extra-boolean-cast': 2, //Disable unnecessary bool conversion
    'no-extra-parens': [2, 'functions'], //Do not allow unnecessary brackets
    'no-fallthrough': 2, //Disable switch penetration
    'no-floating-decimal': 2, //It is forbidden to omit 0.53 in floating-point numbers
    'no-func-assign': 2, //Prohibit duplicate function declaration
    'no-implied-eval': 2, //Do not use implicit eval
    'no-inner-declarations': [2, 'functions'], //Prohibit the use of declarations (variables or functions) in block statements
    'no-invalid-regexp': 2, //Suppress invalid regular expressions
    'no-irregular-whitespace': 2, //Can't have irregular spaces
    'no-iterator': 2, //Disable use of the iterator property
    'no-label-var': 2, //The label name cannot be the same as the variable name declared by var
    'no-labels': [  //Prohibited label declaration
      2,
      {
        allowLoop: false,
        allowSwitch: false
      }
    ],
    'no-lone-blocks': 2, //Suppress unnecessary nested blocks
    'no-mixed-spaces-and-tabs': 2, //Do not mix tab s and spaces
    'no-multi-spaces': 2, //Can't use extra space
    'no-multi-str': 2, //String cannot wrap with
    'no-multiple-empty-lines': [  //No more than 1 empty line
      2,
      {
        max: 1
      }
    ],
    'no-native-reassign': 2, //Cannot override native object
    'no-negated-in-lhs': 2, //The left side of the in operator cannot have!
    'no-new-object': 2, //Do not use new Object()
    'no-new-require': 2, //Do not use new require
    'no-new-symbol': 2, //Do not use new symbol
    'no-new-wrappers': 2, //Do not use new to create a wrapper instance, new String new Boolean new Number
    'no-obj-calls': 2, //You cannot call built-in global objects, such as Math() JSON()
    'no-octal': 2, //Octal numbers are prohibited
    'no-octal-escape': 2, //Octal escape sequence prohibited
    'no-path-concat': 2, //You cannot use dirname or filename for path splicing in node
    'no-proto': 2, //Disable use of proto attribute
    'no-redeclare': 2, //Do not declare variables repeatedly
    'no-regex-spaces': 2, //Prohibit multiple spaces / foo bar in regular expression literals/
    'no-return-assign': [2, 'except-parens'], //The return statement cannot have an assignment expression
    'no-self-assign': 2,  //Self distribution
    'no-self-compare': 2, //Can't compare themselves
    'no-sequences': 2, //Do not use comma operator
    'no-shadow-restricted-names': 2, //The restriction identifier specified in strict mode cannot be used as the variable name when declaring
    'no-spaced-func': 2,  //There can be no space between function name and () when a function is called
    'no-sparse-arrays': 2,  //Disallow sparse array, [1,, 2]
    'no-this-before-super': 2,  //this or super cannot be used until super() is called
    'no-throw-literal': 2,  //It is forbidden to throw literal error throw "error";
    'no-trailing-spaces': 2, //No spaces after the end of a line
    'no-undef': 2, //Cannot have undefined variables
    'no-undef-init': 2, //Variable initialization cannot be directly assigned as undefined
    'no-unexpected-multiline': 2, //Avoid multiline expressions
    'no-unmodified-loop-condition': 2, //Check whether the reference is modified in the loop
    'no-unneeded-ternary': [  // Prohibit the use of ternary operators when there are simpler alternative expressions
      2,
      {
        defaultAssignment: false
      }
    ],
    'no-unreachable': 2, //Can't have code that can't be executed
    'no-unsafe-finally': 2, // The negative operator is prohibited for the left operand of the relational operator. The original no-connected-in-lhs has been replaced by this
    'no-unused-vars': [  //Cannot have variables or parameters that are not used after declaration
      2,
      {
        vars: 'all',
        args: 'none'
      }
    ],
    'no-useless-call': 2, //Do not call or apply unnecessarily
    'no-useless-computed-key': 2, //There is no need to use calculation properties with text
    'no-useless-constructor': 2,  //Class constructors that can be safely removed without changing the way a class works
    'no-useless-escape': 0, // Disable unnecessary escape characters
    'no-whitespace-before-property': 2,  // Blank before prohibited attribute
    'no-with': 2, //Disable with
    'one-var': [ //declaration of continuity
      2,
      {
        initialized: 'never'
      }
    ],
    'operator-linebreak': [  //Is the operator at the end of a line or at the beginning of a line when wrapping
      2,
      'after',
      {
        overrides: {
          '?': 'before',
          ':': 'before'
        }
      }
    ],
    'padded-blocks': [2, 'never'],  //Whether the first and last line of a block statement should be empty
    quotes: [  //Quote type ` ` '' '
      2,
      'single',
      {
        avoidEscape: true,
        allowTemplateLiterals: true
      }
    ],
    semi: [2, 'never'],  //Statement force semicolon end
    'semi-spacing': [  //Space before and after semicolon
      2,
      {
        before: false,
        after: true
      }
    ],
    'space-before-blocks': [2, 'always'], //Do you want a space in front of the block {that does not start with a new line
    'space-before-function-paren': [2, 'never'],  //Do you want spaces before parentheses when defining functions
    'space-in-parens': [2, 'never'], //Do you want spaces in parentheses
    'space-infix-ops': 2, //Do you want spaces around infix operators
    'space-unary-ops': [  //Do you want spaces before / after unary operators
      2,
      {
        words: true,
        nonwords: false
      }
    ],
    'spaced-comment': [  //Comment style, no spaces or anything
      2,
      'always',
      {
        markers: ['global', 'globals', 'eslint', 'eslint-disable', '*package', '!', ',']
      }
    ],
    'template-curly-spacing': [2, 'never'], // Requires or disables the use of spaces around embedded expressions in Template Strings
    'use-isnan': 2,  //NaN is prohibited for comparison, only isNaN()
    'valid-typeof': 2,  //Legal typeof value must be used
    'wrap-iife': [2, 'any'],  //Bracket style for immediate function expression execution
    'yield-star-spacing': [2, 'both'], // Force spaces around * in yield * expressions
    yoda: [2, 'never'],  //Prohibited Yoda conditions
    'prefer-const': 2, //First choice const
    'no-debugger': process.env.NODE_ENV === 'production' ? 2 : 0,  //Disable debugger
    'object-curly-spacing': [  //Allow unnecessary spaces in braces
      2,
      'always',
      {
        objectsInObjects: false
      }
    ],
    'array-bracket-spacing': [2, 'never'] //Allow extra space in non empty array
  }

"eslintConfig": {
  root: true,
  env: {
    node: true
  },
  'extends': [
    'plugin:vue/essential',
    'eslint:recommended'
  ],
  parserOptions: {
    parser: 'babel-eslint'
  },
  rules: {
    'no-console': process.env.NODE_ENV === 'production' ? 'warn' : 'off',
    'no-debugger': process.env.NODE_ENV === 'production' ? 'warn' : 'off'
  }
}

 devServer: {
        overlay: {
            warnings: false,
            errors: false
        },
      
    }

  lintOnSave: false