.eslintrc.json

{
  "parserOptions": {
    "sourceType": "module",
    "ecmaVersion": 2018
  },
  "env": {
    "node": true,
    "es6": true,
    "browser": true,
    "webextensions": true
  },
  "extends": "eslint:recommended",
  "rules": {
    "arrow-parens": 2,
    "arrow-spacing": 2,
    "brace-style": [2, "1tbs", { "allowSingleLine": false }],
    "callback-return": 2,
    "camelcase": 1,
    "comma-spacing": 1,
    "curly": [2, "multi-line"],
    "dot-notation": [2, { "allowKeywords": true }],
    "eol-last": 2,
    "eqeqeq": 2,
    "handle-callback-err": 2,
    "key-spacing": [1, { "beforeColon": false, "afterColon": true }],
    "keyword-spacing": 1,
    "indent": [1, 2, { "SwitchCase": 1, "MemberExpression": 1 }],
    "new-cap": 0,
    "new-parens": 1,
    "no-alert": 2,
    "no-array-constructor": 2,
    "no-caller": 2,
    "no-case-declarations": 0,
    "no-catch-shadow": 2,
    "no-console": 2,
    "no-duplicate-imports": 1,
    "no-eval": 2,
    "no-extend-native": 2,
    "no-extra-bind": 2,
    "no-extra-parens": [1, "functions"],
    "no-implied-eval": 2,
    "no-iterator": 2,
    "no-label-var": 2,
    "no-labels": 2,
    "no-lone-blocks": 2,
    "no-loop-func": 2,
    "no-multi-spaces": 1,
    "no-multi-str": 2,
    "no-multiple-empty-lines": 1,
    "no-native-reassign": 2,
    "no-new": 2,
    "no-new-func": 2,
    "no-new-object": 2,
    "no-new-symbol": 2,
    "no-new-wrappers": 2,
    "no-octal-escape": 2,
    "no-path-concat": 2,
    "no-process-exit": 2,
    "no-proto": 2,
    "no-return-assign": 2,
    "no-script-url": 2,
    "no-sequences": 2,
    "no-shadow": 2,
    "no-shadow-restricted-names": 2,
    "no-spaced-func": 2,
    "no-trailing-spaces": 1,
    "no-underscore-dangle": 0,
    "no-unused-expressions": 2,
    "no-use-before-define": [2, "nofunc"],
    "no-var": 2,
    "no-with": 2,
    "prefer-arrow-callback": 2,
    "prefer-const": ["error", {"destructuring": "all"}],
    "prefer-template": 1,
    "quotes": [1, "double"],
    "semi": [2, "always"],
    "semi-spacing": [1, {"before": false, "after": true}],
    "space-before-blocks": 1,
    "space-before-function-paren": [1, {"anonymous": "always", "named": "never"}],
    "space-infix-ops": 1,
    "space-in-parens": [2, "never"],
    "space-unary-ops": [1, { "words": true, "nonwords": false }],
    "strict": [2, "global"],
    "yoda": [1, "never"]
  }
}