.eslintrc.json

{
  "parser": "espree",
  "parserOptions": {
    "sourceType": "module",
    "ecmaVersion": 2018
  },
  "env": {
    "es6": true,
    "shared-node-browser": true
  },
  "extends": "eslint:recommended",
  "rules": {
    "arrow-parens": "error",
    "arrow-spacing": "error",
    "brace-style": [
      "error",
      "1tbs",
      { "allowSingleLine": false }
    ],
    "comma-dangle": [
      "error",
      {
        "arrays": "always-multiline",
        "objects": "always-multiline",
        "imports": "always-multiline",
        "exports": "always-multiline",
        "functions": "never"
      }
    ],
    "comma-spacing": "error",
    "curly": [
      "error",
      "multi-line"
    ],
    "dot-notation": [
      "error",
      { "allowKeywords": true }
    ],
    "eol-last": "error",
    "eqeqeq": "error",
    "handle-callback-err": "error",
    "indent": [ "error", 2, { "SwitchCase": 1 } ],
    "key-spacing": [
      "error",
      {
        "beforeColon": false,
        "afterColon": true
      }
    ],
    "keyword-spacing": "error",
    "linebreak-style": [ "error", "unix" ],
    "new-parens": "error",
    "no-alert": "error",
    "no-array-constructor": "error",
    "no-caller": "error",
    "no-catch-shadow": "error",
    "no-console": "error",
    "no-eval": "error",
    "no-extend-native": "error",
    "no-extra-bind": "error",
    "no-extra-parens": [
      "error",
      "functions"
    ],
    "no-fallthrough": 0,
    "no-implied-eval": "error",
    "no-iterator": "error",
    "no-label-var": "error",
    "no-labels": "error",
    "no-lone-blocks": "error",
    "no-loop-func": "error",
    "no-multi-spaces": "error",
    "no-multi-str": "error",
    "no-multiple-empty-lines": [ "error", {
      "max": 1,
      "maxEOF": 0,
      "maxBOF": 0
    } ],
    "no-native-reassign": "error",
    "no-new-func": "error",
    "no-new-object": "error",
    "no-new-wrappers": "error",
    "no-octal-escape": "error",
    "no-path-concat": "error",
    "no-process-exit": "error",
    "no-proto": "error",
    "no-return-assign": "error",
    "no-script-url": "error",
    "no-sequences": "error",
    "no-shadow": "error",
    "no-spaced-func": "error",
    "no-trailing-spaces": "error",
    "no-undef": "error",
    "no-undef-init": "error",
    "no-underscore-dangle": "off",
    "no-unused-expressions": "error",
    "no-use-before-define": [
      "error",
      "nofunc"
    ],
    "no-var": "error",
    "no-useless-concat": "error",
    "no-whitespace-before-property": "error",
    "object-shorthand": [ "error", "properties" ],
    "switch-colon-spacing": "error",
    "prefer-arrow-callback": "error",
    "prefer-const": [
      "error",
      { "destructuring": "all" }
    ],
    "quote-props": [ "error", "as-needed" ],
    "quotes": [
      "error",
      "single",
      { "avoidEscape": true }
    ],
    "require-await": "error",
    "semi": [ "error", "always" ],
    "semi-spacing": [
      "error",
      {
        "before": false,
        "after": true
      }
    ],
    "space-before-blocks": "error",
    "space-before-function-paren": [ "error", {
      "anonymous": "always",
      "named": "never",
      "asyncArrow": "always"
    } ],
    "space-infix-ops": "error",
    "space-unary-ops": [
      "error",
      {
        "words": true,
        "nonwords": false
      }
    ],
    "space-in-parens": [ "error", "never" ],
    "spaced-comment": "error",
    "strict": [ "error", "global" ],
    "template-curly-spacing": [ "error", "never" ],
    "yoda": ["error", "never"]
  }
}