.eslintrc.json

{
  "extends": [
    "eslint:recommended"
  ],

  "env": {
    "browser": false,
    "es6": true,
    "node": true,
    "mocha": true
  },

  "parserOptions":{
    "ecmaVersion": 9,
    "sourceType": "module",
    "ecmaFeatures": {
      "modules": true,
      "experimentalObjectRestSpread": true
    }
  },

  "globals": {
    "document": false,
    "navigator": false,
    "window": false
  },

  "rules": {
    "accessor-pairs": 2,
    "arrow-spacing": [2, { "before": true, "after": true }],
    "block-spacing": [2, "always"],
    "brace-style": [2, "1tbs", { "allowSingleLine": true }],
    "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 }],
    "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-debugger": 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-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,
    "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": 0,
    "no-negated-in-lhs": 2,
    "no-new": 2,
    "no-new-func": 2,
    "no-new-object": 2,
    "no-new-require": 2,
    "no-new-wrappers": 2,
    "no-obj-calls": 2,
    "no-octal": 2,
    "no-octal-escape": 2,
    "no-proto": 0,
    "no-redeclare": 2,
    "no-regex-spaces": 2,
    "no-return-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": 0,
    "no-undef": 2,
    "no-undef-init": 2,
    "no-unexpected-multiline": 2,
    "no-unneeded-ternary": [2, { "defaultAssignment": false }],
    "no-unreachable": 2,
    "no-unused-vars": [2, { "vars": "all", "args": "none" }],
    "no-useless-call": 0,
    "no-with": 2,
    "one-var": [0, { "initialized": "never" }],
    "operator-linebreak": [0, "after", { "overrides": { "?": "before", ":": "before" } }],
    "padded-blocks": [0, "never"],
    "quotes": [2, "single", "avoid-escape"],
    "radix": 2,
    "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": [0, "always", { "markers": ["global", "globals", "eslint", "eslint-disable", "*package", "!", ","] }],
    "use-isnan": 2,
    "valid-typeof": 2,
    "wrap-iife": [2, "any"],
    "yoda": [2, "never"]
  }
}