.eslintrc.js

module.exports = {
  parserOptions: {
    ecmaVersion: 6,
    ecmaFeatures: {
      experimentalObjectRestSpread: true,
      jsx: true
    },
    sourceType: 'module'
  },

  env: {
    es6: true,
    node: true,
    mocha: true
  },

  plugins: ['vue'],

  globals: {
    expect: true,
    sinon: true,
    document: false,
    navigator: false,
    window: false,
    require: true,
    FileReader: true,
    File: true
  },

  rules: {
    'accessor-pairs': 2,
    'arrow-spacing': [2, { 'before': true, 'after': true }],
    'block-spacing': [2, 'always'],
    'brace-style': [2, '1tbs', { 'allowSingleLine': true }],
    'camelcase': [1, { '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': [2, 'allow-null'],
    'generator-star-spacing': [2, { 'before': true, 'after': true }],
    'handle-callback-err': [2, '^(err|error)$' ],
    'indent': [2, 2, { 'SwitchCase': 1 }],
    'jsx-quotes': [2, 'prefer-double'],
    '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-class-assign': 2,
    'no-cond-assign': 2,
    'no-const-assign': 2,
    'no-control-regex': 2,
    '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, 'always'],
    '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'],
    'vue/jsx-uses-vars': 2
  }
}