.eslintrc

{
  "env": {
    "es6": true,
    "node": true,
    "browser": true
  },
  "extends": [
    "eslint:recommended",
    "plugin:jest/recommended"
  ],
  "parserOptions": {
    "ecmaVersion": 9,
    "ecmaFeatures": {
      "experimentalObjectRestSpread": true,
      "destructuring": true,
      "spread": true
    },
    "sourceType": "module"
  },
  "rules": {
    // Possible Errors
    "comma-dangle": [2, "never"],
    "computed-property-spacing": [2, "never"],
    "no-cond-assign": 2,
    "no-console": 2,
    "no-constant-condition": 2,
    "no-control-regex": 2,
    "no-debugger": 2,
    "no-dupe-keys": 2,
    "no-empty": 2,
    "no-empty-character-class": 2,
    "no-ex-assign": 2,
    "no-extra-boolean-cast": 2,
    "no-extra-parens": 0,
    "no-extra-semi": 2,
    "no-func-assign": 2,
    "no-inner-declarations": 2,
    "no-invalid-regexp": 2,
    "no-irregular-whitespace": 2,
    "no-negated-in-lhs": 2,
    "no-obj-calls": 2,
    "no-regex-spaces": 2,
    "no-reserved-keys": 0,
    "no-sparse-arrays": 2,
    "no-unreachable": 2,
    "use-isnan": 2,
    "valid-jsdoc": 0,
    "valid-typeof": 2,
    // Best Practices
    "block-scoped-var": 2,
    "complexity": 0,
    "consistent-return": 2,
    "curly": 2,
    "default-case": 2,
    "dot-notation": 2,
    "eqeqeq": 2,
    "guard-for-in": 2,
    "no-alert": 2,
    "no-caller": 2,
    "no-confusing-arrow": 2,
    "no-div-regex": 2,
    "no-else-return": 2,
    "no-eq-null": 2,
    "no-eval": 2,
    "no-extend-native": 2,
    "no-extra-bind": 2,
    "no-fallthrough": 2,
    "no-floating-decimal": 2,
    "no-implied-eval": 2,
    "no-iterator": 2,
    "no-labels": 2,
    "no-lone-blocks": 2,
    "no-loop-func": 2,
    "no-multi-spaces": 2,
    "no-multi-str": 2,
    "no-native-reassign": 2,
    "no-new": 2,
    "no-new-func": 2,
    "no-new-wrappers": 2,
    "no-octal": 2,
    "no-octal-escape": 2,
    // "no-process-env": 2,
    "no-proto": 2,
    "no-redeclare": 2,
    "no-return-assign": 2,
    "no-script-url": 2,
    "no-self-compare": 2,
    "no-sequences": 2,
    "no-unused-expressions": 2,
    "no-void": 0,
    "no-warning-comments": 2,
    "no-with": 2,
    "prefer-arrow-callback": 2,
    "radix": 2,
    "vars-on-top": 0,
    "wrap-iife": 2,
    "yoda": 2,
    // Strict Mode
    "strict": [2, "never"],
    // Variables
    "prefer-const": 2,
    "no-catch-shadow": 2,
    "no-const-assign": 2,
    "no-delete-var": 2,
    "no-label-var": 2,
    "no-shadow": 2,
    "no-shadow-restricted-names": 2,
    "no-undef": 2,
    "no-undef-init": 2,
    "no-undefined": 2,
    "no-unused-vars": 2,
    "no-use-before-define": 2,
    "no-var": 2,
    // Stylistic Issues
    "indent": [2, 2, {
      "SwitchCase": 1
    }],
    "arrow-body-style": [2, "as-needed"],
    "arrow-parens": [2, "as-needed"],
    "arrow-spacing": 2,
    "brace-style": 2,
    "camelcase": 0,
    "comma-spacing": 2,
    "comma-style": 2,
    "consistent-this": 0,
    "eol-last": 2,
    "func-names": 0,
    "func-style": 0,
    "key-spacing": [2, {
      "beforeColon": false,
      "afterColon": true
    }],
    "max-nested-callbacks": 0,
    "new-cap": 2,
    "new-parens": 2,
    "no-array-constructor": 2,
    "no-inline-comments": 0,
    "no-lonely-if": 2,
    "no-mixed-spaces-and-tabs": 2,
    "no-nested-ternary": 2,
    "no-new-object": 2,
    "semi-spacing": [2, {
      "before": false,
      "after": true
    }],
    "no-spaced-func": 2,
    "no-ternary": 0,
    "no-trailing-spaces": 2,
    "no-multiple-empty-lines": 2,
    "no-underscore-dangle": 0,
    "one-var": 0,
    "operator-assignment": [2, "always"],
    "padded-blocks": [2, { "blocks": "never", "classes": "never", "switches": "never" }],
    "quotes": [2, "single"],
    "quote-props": [2, "as-needed"],
    "semi": [2, "always"],
    "sort-vars": [2, {"ignoreCase": true}],
    "keyword-spacing": 2,
    "space-before-blocks": 2,
    "object-curly-spacing": [2, "never"],
    "array-bracket-spacing": [2, "never"],
    "space-in-parens": 2,
    "space-infix-ops": 2,
    "space-unary-ops": 2,
    "spaced-comment": 2,
    "wrap-regex": 0,
    // Legacy
    "max-depth": 0,
    "max-len": [2, 120, {
      "ignoreStrings": true,
      "ignoreTemplateLiterals": true,
      "ignoreComments": true
    }],
    "max-params": 0,
    "max-statements": 0,
    "no-plusplus": 0,
    "no-prototype-builtins": 2,
    "prefer-template": 2,
    "template-curly-spacing": [2, "never"]
  },
  "plugins": [
    "jest"
  ]
}