.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": 0,
    "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: [0, "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
  }
};