.eslintrc.js

module.exports = {
  "env": {
    "browser": true,
    "es6": true,
    "node": true
  },
  "extends": "eslint:recommended",
  "parserOptions": {
    "sourceType": "module"
  },
  "rules": {
    /* Possible Errors */
    "for-direction": "error",
    "getter-return": "error",
    "no-console": "off",
    "no-empty": ["error", { "allowEmptyCatch": true }],
    "no-extra-parens": ["warn", "all", { "returnAssign": false, "nestedBinaryExpressions": false }],
    "no-prototype-builtins": "error",
    "valid-jsdoc": [
      "warn",
      {
        "prefer": { "arg": "param", "argument": "param", "constructor": "class", "returns": "return" },
        "preferType": { "Boolean": "boolean", "Number": "number", "object": "Object", "String": "string" },
        "requireParamDescription": false,
        "requireReturnDescription": false
      }
    ],
    /* Best Practices */
    "accessor-pairs": "error",
    "block-scoped-var": "error",
    "class-methods-use-this": "error",
    "curly": "error",
    "default-case": "error",
    "dot-location": ["error", "property"],
    "dot-notation": ["error", { "allowKeywords": false }],
    "eqeqeq": ["error", "always", { "null": "ignore" }],
    "guard-for-in": "error",
    "no-alert": "error",
    "no-caller": "error",
    "no-eval": "error",
    "no-extend-native": "error",
    "no-extra-bind": "error",
    "no-extra-label": "error",
    "no-floating-decimal": "error",
    "no-implicit-coercion": ["error", { "boolean": false }],
    "no-implicit-globals": "error",
    "no-implied-eval": "error",
    "no-iterator": "error",
    "no-lone-blocks": "error",
    "no-loop-func": "error",
    "no-multi-str": "error",
    "no-new-func": "error",
    "no-new-wrappers": "error",
    "no-octal-escape": "error",
    "no-param-reassign": ["warn", { "props": true }],
    "no-proto": "error",
    "no-return-assign": "error",
    "no-return-await": "error",
    "no-script-url": "error",
    "no-self-compare": "error",
    "no-sequences": "error",
    "no-throw-literal": "error",
    "no-unused-expressions": "error",
    "no-useless-call": "error",
    "no-useless-return": "error",
    "no-void": "error",
    "no-with": "error",
    "prefer-promise-reject-errors": "error",
    "radix": "error",
    "require-await": "error",
    "vars-on-top": "error",
    "wrap-iife": ["error", "inside"],
    "yoda": "error",
    /* Strict Mode */
    "strict": "error",
    /* Variables */
    "no-catch-shadow": "error",
    "no-label-var": "error",
    "no-shadow-restricted-names": "error",
    "no-undef-init": "error",
    "no-undefined": "error",
    "no-unused-vars": "warn",
    "no-use-before-define": "warn",
    /* Node.js and CommonJS */
    "no-path-concat": "error",
    "no-new-require": "error",
    /* Stylistic Issues */
    "array-bracket-spacing": "error",
    "array-element-newline": ["error", { "multiline": true }],
    "block-spacing": "error",
    "brace-style": ["error", "1tbs", { "allowSingleLine": true }],
    "camelcase": "warn",
    "capitalized-comments": ["error", "always", { "line": { "ignoreConsecutiveComments": true } }],
    "comma-dangle": "error",
    "comma-spacing": "error",
    "comma-style": "error",
    "computed-property-spacing": "error",
    "eol-last": "error",
    "func-call-spacing": "error",
    "func-name-matching": "error",
    "indent": ["error", 4, { "SwitchCase": 1 }],
    "jsx-quotes": "error",
    "key-spacing": ["error", { "mode": "minimum" }],
    "keyword-spacing": "error",
    "linebreak-style": "error",
    "max-len": [
      "error",
      {
        "code": 76,
        "ignoreUrls": true,
        "ignoreStrings": true,
        "ignoreTemplateLiterals": true,
        "ignoreRegExpLiterals": true
      }
    ],
    "max-statements-per-line": ["error", { "max": 2 }],
    "new-cap": "error",
    "new-parens": "error",
    "no-array-constructor": "error",
    "no-mixed-spaces-and-tabs": ["error", "smart-tabs"],
    "no-multiple-empty-lines": ["error", { "max": 1, "maxEOF": 1, "maxBOF": 0 }],
    "no-new-object": "error",
    "no-tabs": "error",
    "no-trailing-spaces": "error",
    "no-underscore-dangle": "error",
    "no-unneeded-ternary": "error",
    "no-whitespace-before-property": "error",
    "nonblock-statement-body-position": "error",
    "object-curly-newline": ["error", { "multiline": true, "consistent": true }],
    "object-curly-spacing": ["error", "always"],
    "one-var": ["error", { "initialized": "never" }],
    "operator-linebreak": "error",
    "padded-blocks": ["error", "never"],
    "quote-props": ["error", "consistent"],
    "quotes": ["error", "single"],
    "semi": "error",
    "semi-spacing": "error",
    "semi-style": "error",
    "space-before-blocks": "error",
    "space-before-function-paren": ["error", { "anonymous": "always", "named": "never", "asyncArrow": "always" }],
    "space-in-parens": "error",
    "space-infix-ops": "error",
    "space-unary-ops": ["error", { "words": true, "nonwords": false }],
    "spaced-comment": ["error", "always", { "exceptions": ["*", "!"] }],
    "switch-colon-spacing": "error",
    "unicode-bom": "error",
    "wrap-regex": "error",
    /* ECMAScript 6 */
    "arrow-parens": ["error", "as-needed", { "requireForBlockBody": true }],
    "arrow-spacing": "error",
    "generator-star-spacing": ["error", "after"],
    "no-duplicate-imports": ["error", { "includeExports": true }],
    "no-useless-constructor": "error",
    "no-useless-rename": "error",
    "rest-spread-spacing": "error",
    "template-curly-spacing": "error",
    "yield-star-spacing": ["error", "after"]
  }
};