.eslintrc.json

{
  "env": {
    "es6": true,
    "node": true
  },
  "extends": "eslint:recommended",
  "globals": {
    "Atomics": "readable",
    "BigInt": "readable",
    "BigInt64Array": "readable",
    "BigUint64Array": "readable",
    "queueMicrotask": "readable",
    "SharedArrayBuffer": "readable",
    "TextEncoder": "readable",
    "TextDecoder": "readable"
  },
  "overrides": [
    {
      "files": ["*.mjs"],
      "parserOptions": {
        "sourceType": "module"
      }
    },
    {
      "files": ["*.cjs"],
      "parserOptions": {
        "sourceType": "script"
      }
    },
    {
      "files": [
        "test/{,**/}*.{mjs,cjs,js}"
      ],
      "env": {
        "mocha": true
      },
      "globals": {
        "register": "readable"
      },
      "rules": {
        "max-len": "off",
        "prefer-arrow-callback": "off"
      }
    }
  ],
  "parser": "babel-eslint",
  "parserOptions": {
    "ecmaVersion": 10,
    "ecmaFeatures": {
      "globalReturn": true
    },
    "requireConfigFile": false,
    "sourceType": "script"
  },
  "root": true,
  "rules": {
    "array-bracket-spacing": ["error", "never"],
    "arrow-parens": ["error", "as-needed", {
      "requireForBlockBody": true
    }],
    "arrow-spacing": "error",
    "block-spacing": ["error", "always"],
    "brace-style": ["error", "1tbs"],
    "camelcase": ["error", {
      "properties": "never"
    }],
    "comma-dangle": ["error", "never"],
    "consistent-return": "error",
    "eol-last": ["error", "always"],
    "eqeqeq": ["error", "always", {
      "null": "ignore"
    }],
    "func-name-matching": "error",
    "indent": ["off", 2, {
      "ArrayExpression": "off",
      "SwitchCase": 1,
      "CallExpression": {
        "arguments": "off"
      },
      "FunctionDeclaration": {
        "parameters": "off"
      },
      "FunctionExpression": {
        "parameters": "off"
      },
      "MemberExpression": "off",
      "ObjectExpression": "off",
      "ImportDeclaration": "off"
    }],
    "handle-callback-err": "off",
    "linebreak-style": ["error", "unix"],
    "max-len": ["error", {
      "code": 80,
      "ignorePattern": "function \\w+\\(",
      "ignoreUrls": true
    }],
    "max-statements-per-line": ["error", {
      "max": 1
    }],
    "new-cap": ["error", {
      "newIsCap": true,
      "capIsNew": false
    }],
    "new-parens": "error",
    "no-buffer-constructor": "error",
    "no-console": "off",
    "no-extra-semi": "off",
    "no-fallthrough": "off",
    "no-func-assign": "off",
    "no-implicit-coercion": "error",
    "no-multi-assign": "error",
    "no-multiple-empty-lines": ["error", {
      "max": 1
    }],
    "no-nested-ternary": "error",
    "no-param-reassign": "off",
    "no-return-assign": "error",
    "no-return-await": "off",
    "no-shadow-restricted-names": "error",
    "no-tabs": "error",
    "no-trailing-spaces": "error",
    "no-unused-vars": ["error", {
      "vars": "all",
      "args": "none",
      "ignoreRestSiblings": false
    }],
    "no-use-before-define": ["error", {
      "functions": false,
      "classes": false
    }],
    "no-useless-escape": "off",
    "no-var": "error",
    "nonblock-statement-body-position": ["error", "below"],
    "padded-blocks": ["error", "never"],
    "prefer-arrow-callback": "error",
    "prefer-const": ["error", {
      "destructuring": "all",
      "ignoreReadBeforeAssign": true
    }],
    "prefer-template": "off",
    "quotes": ["error", "single"],
    "semi": ["error", "always"],
    "spaced-comment": ["error", "always", {
      "exceptions": ["!"]
    }],
    "space-before-blocks": "error",
    "strict": "error",
    "unicode-bom": ["error", "never"],
    "valid-jsdoc": "error",
    "wrap-iife": ["error", "inside"],
    "space-unary-ops": "error",
    "space-infix-ops": "error",
    "comma-spacing": "error",
    "keyword-spacing": "error"
  }
}