.eslintrc.json

{
  "extends": "eslint:recommended",
  "env": {
    "es6": true,
    "node": true
  },
  "parserOptions": {
    "ecmaVersion": 9
  },
  "rules": {
    // error
    "array-bracket-spacing": [2, "never"],
    "block-scoped-var": 2,
    "brace-style": [2, "stroustrup", {
      "allowSingleLine": true
    }],
    "comma-dangle": [2, "never"],
    "comma-spacing": 2,
    "comma-style": [2, "last"],
    "computed-property-spacing": [2, "never"],
    "curly": [2, "all"],
    "eol-last": 2,
    "eqeqeq": [2, "always"],
    "guard-for-in": 2,
    "indent": [2, 2, {
      "MemberExpression": "off",
      "SwitchCase": 1
    }],
    "key-spacing": [2, {
      "beforeColon": false,
      "afterColon": true
    }],
    "keyword-spacing": 2,
    "linebreak-style": [2, "unix"],
    "lines-around-comment": [2, {
      "beforeBlockComment": true,
      "afterBlockComment": false
    }],
    "new-parens": 2,
    "no-array-constructor": 2,
    "no-caller": 2,
    "no-catch-shadow": 2,
    "no-console": 2,
    "no-empty": [2, {
      "allowEmptyCatch": true
    }],
    "no-eval": 2,
    "no-extend-native": 2,
    "no-extra-bind": 2,
    "no-extra-parens": [2, "functions"],
    "no-implied-eval": 2,
    "no-iterator": 2,
    "no-label-var": 2,
    "no-labels": [2, {
      "allowLoop": true,
      "allowSwitch": true
    }],
    "no-lone-blocks": 2,
    "no-loop-func": 2,
    "no-multi-spaces": [2, {
      "ignoreEOLComments": true
    }],
    "no-multi-str": 2,
    "no-native-reassign": 2,
    "no-nested-ternary": 2,
    "no-new-func": 2,
    "no-new-object": 2,
    "no-new-wrappers": 2,
    "no-octal-escape": 2,
    "no-param-reassign": [2, {
      "props": false
    }],
    "no-process-exit": 2,
    "no-proto": 2,
    "no-return-assign": 2,
    "no-script-url": 2,
    "no-sequences": 2,
    "no-shadow-restricted-names": 2,
    "no-spaced-func": 2,
    "no-trailing-spaces": 2,
    "no-undef-init": 2,
    "no-undefined": 2,
    "no-unused-vars": [2, {
      "args": "after-used",
      "vars": "all"
    }],
    "no-with": 2,
    "object-curly-spacing": [2, "never"],
    "one-var": [2, "never"],
    "quote-props": [2, "as-needed"],
    "quotes": [2, "single"],
    "semi": [2, "always"],
    "semi-spacing": [2, {
      "before": false,
      "after": true
    }],
    "space-before-blocks": [2, "always"],
    "space-before-function-paren": [2, {
      "anonymous": "always",
      "named": "never"
    }],
    "space-in-parens": [2, "never"],
    "space-infix-ops": 2,
    "space-unary-ops": [2, {
      "nonwords": false,
      "words": true
    }],
    "spaced-comment": [2, "always"],
    "strict": 2,
    "yoda": [2, "never"],
    // warn
    "max-len": [1, 120, 4, {
      "ignoreComments": false,
      "ignoreUrls": true
    }],
    "max-nested-callbacks": [1, 7],
    "no-unused-expressions": 1,
    "no-use-before-define": 1,
    "valid-jsdoc": [1, {
      "requireReturn": false
    }],
    // off
    "no-duplicate-case": 0,
    "no-fallthrough": 0
  }
}