.eslintrc.js

module.exports = {
    env: {
        es6: true,
        node: true
    },

    extends: [
        'eslint:recommended'
    ],

    parserOptions: {
        parser: 'babel-eslint',
        ecmaVersion: 2017,
        sourceType: 'module'
    },

    globals: {
        before: true,
        after: true,
        afterEach: true,
        describe: true,
        it: true,
        JSON: true,
        console: true,
        '$': true,
        M: true,
        document: true,
        location: true,
        window: true,
        sessionStorage: true,
        localStorage: true,
        Blob: true,
        L: true,
        Materialize: true,
        navigator: true,
        alert: true,
        import: true,
        require: true,
        fetch: true
    },

    rules: {
        indent: [
            2,
            4,
            { SwitchCase: 1 }
        ],
        'linebreak-style': [ 2, 'unix' ],
        'max-len': [
            2,
            {
                code: 120,
                tabWidth: 4,
                ignoreStrings: true,
                ignoreRegExpLiterals: true
            }
        ],
        'max-depth': [ 1, 5 ],
        'max-lines': [ 1, 1500 ],
        'max-params': [ 1, 6 ],
        'max-statements': [ 1, 30 ],
        'accessor-pairs': 'off',
        'arrow-spacing': [
            1,
            {
                before: true,
                after: true
            }
        ],
        'block-spacing': [ 1, 'always' ],
        camelcase: 'off',
        'comma-dangle': [ 1, 'never' ],
        'comma-spacing': [
            1,
            {
                before: false,
                after: true
            }
        ],
        'comma-style': [ 1, 'last' ],
        'constructor-super': 1,
        curly: 2,
        'template-curly-spacing': [ 1, 'always' ],
        'object-curly-spacing': [ 1, 'always' ],
        'dot-location': [ 1, 'property' ],
        'eol-last': 1,
        eqeqeq: [ 1, 'allow-null' ],
        'generator-star-spacing': [
            1,
            {
                before: true,
                after: true
            }
        ],
        'handle-callback-err': [ 1, '^(err|error)$' ],
        'key-spacing': 'off',
        'keyword-spacing': [
            1,
            {
                overrides: {
                    catch: { after: true },
                    if: { after: true },
                    for: { after: true },
                    while: { after: true },
                    switch: { after: true }
                }
            }
        ],
        'new-cap': [
            1,
            {
                newIsCap: true,
                capIsNew: false
            }
        ],
        'new-parens': 1,
        'no-array-constructor': 1,
        'no-caller': 1,
        'no-case-declarations': 'off',
        'no-class-assign': 1,
        'no-cond-assign': 1,
        'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
        'no-const-assign': 1,
        'no-control-regex': 1,
        'no-debugger': process.env.NODE_ENV === 'production' ? 'error' : 'off',
        'no-delete-var': 1,
        'no-dupe-args': 1,
        'no-dupe-class-members': 1,
        'no-dupe-keys': 1,
        'no-duplicate-case': 1,
        'no-duplicate-imports': 1,
        'no-empty-character-class': 1,
        'no-empty-pattern': 1,
        'no-eval': 1,
        'no-ex-assign': 1,
        'no-extend-native': 1,
        'no-extra-bind': 1,
        'no-extra-boolean-cast': 'off',
        'no-extra-parens': [ 1, 'functions' ],
        'no-fallthrough': 1,
        'no-floating-decimal': 1,
        'no-func-assign': 1,
        'no-implied-eval': 1,
        'no-inner-declarations': [ 1, 'functions' ],
        'no-trailing-spaces': 'off',
        'no-invalid-regexp': 1,
        'no-irregular-whitespace': 1,
        'no-iterator': 1,
        'no-label-var': 1,
        'no-labels': [
            1,
            {
                allowLoop: false,
                allowSwitch: false
            }
        ],
        'no-lone-blocks': 1,
        'no-mixed-spaces-and-tabs': 1,
        'no-multi-spaces': 'off',
        'no-multi-str': 1,
        'no-multiple-empty-lines': [ 1, { max: 4 } ],
        'no-native-reassign': 1,
        'no-negated-in-lhs': 1,
        'no-new': 1,
        'no-new-func': 1,
        'no-new-object': 1,
        'no-new-require': 1,
        'no-new-symbol': 1,
        'no-new-wrappers': 1,
        'no-obj-calls': 1,
        'no-octal': 1,
        'no-octal-escape': 1,
        'no-path-concat': 1,
        'no-proto': 1,
        'no-redeclare': 1,
        'no-regex-spaces': 1,
        'no-return-assign': 'off',
        'no-self-assign': 1,
        'no-self-compare': 0,
        'no-sequences': 'off',
        'no-shadow-restricted-names': 1,
        'no-spaced-func': 1,
        'no-sparse-arrays': 1,
        'no-this-before-super': 1,
        'no-throw-literal': 1,
        'no-undef': 2,
        'no-undef-init': 1,
        'no-unexpected-multiline': 1,
        'no-unmodified-loop-condition': 1,
        'no-unneeded-ternary': [
            1,
            {
                defaultAssignment: false
            }
        ],
        'no-unreachable': 1,
        'no-unsafe-finally': 1,
        'no-unused-vars': [
            1,
            {
                vars: 'local',
                args: 'after-used'
            }
        ],
        'no-useless-call': 1,
        'no-useless-computed-key': 1,
        'no-useless-constructor': 1,
        'no-useless-escape': 1,
        'no-whitespace-before-property': 1,
        'no-with': 1,
        'one-var': [ 1, { 'var': 'always' } ],
        'operator-linebreak': [
            1,
            'after',
            {
                overrides: {
                    '?': 'after',
                    ':': 'after'
                }
            }
        ],
        'padded-blocks': 'off',
        quotes: 'off',
        'require-jsdoc': [
            0,
            {
                require: {
                    FunctionDeclaration: true,
                    MethodDefinition: true,
                    ClassDeclaration: true
                }
            }
        ],
        semi: [ 2, 'always' ],
        'semi-style': [ 2, 'last' ],
        'semi-spacing': [
            1,
            {
                before: false,
                after: true
            }
        ],
        'space-before-blocks': [ 1, 'always' ],
        'space-before-function-paren': [
            1, {
                anonymous: 'never',
                named: 'never',
                asyncArrow: 'always'
            }
        ],
        'space-in-parens': [ 1, 'always' ],
        'space-infix-ops': 1,
        'space-unary-ops': [
            1,
            {
                words: true,
                nonwords: false
            }
        ],
        'spaced-comment': [
            1,
            'always',
            {
                markers: [
                    'global',
                    'globals',
                    'eslint',
                    'eslint-disable',
                    '*package',
                    '!',
                    ','
                ]
            }
        ],
        'use-isnan': 1,
        'valid-jsdoc': [ 1, { requireReturn: false } ],
        'valid-typeof': 1,
        'wrap-iife': [ 1, 'any' ],
        'yield-star-spacing': [ 1, 'both' ],
        yoda: [ 1, 'never' ],
        'max-statements-per-line': [ 1, { max: 2 } ]
    },

    overrides: [
        {
            files: [ '*.vue' ],
            rules: {
                'indent': 'off',
                'vue/script-indent': [
                    'warn',
                    'tab',
                    { baseIndent: 1 }
                ]
            }
        }
    ],

    root: true
};