.eslintrc.json

{
  "env": {
    "browser": false,
    "commonjs": true,
    "es6": true,
    "node": true,
    "mocha": true
  },
  "plugins": [
    "prettier"
  ],
  "extends": [
    "eslint:recommended",
    "plugin:prettier/recommended"
  ],
  "parserOptions": {
    "ecmaVersion": 2021,
    "sourceType": "commonjs"
  },
  "rules": {
    "no-const-assign": "warn",
    "no-this-before-super": "warn",
    "no-undef": "warn",
    "no-unreachable": "warn",
    "no-unused-vars": "warn",
    "constructor-super": "warn",
    "valid-typeof": "warn",
    "indent": [
      "error",
      2,
      {
        "SwitchCase": 1
      }
    ],
    "linebreak-style": [
      "error",
      "unix"
    ],
    "quotes": [
      "error",
      "single",
      {
        "avoidEscape": true
      }
    ],
    "semi": [
      "error",
      "never"
    ],
    "eqeqeq": "off",
    "no-trailing-spaces": "off",
    "padded-blocks": "off",
    "prettier/prettier": [
      "error",
      {
        "trailingComma": "es5",
        "singleQuote": true,
        "tabWidth": 2,
        "semi": false,
        "printWidth": 120
      }
    ]
  },
  "overrides": [
    {
      "files": [
        "*.js"
      ],
      "rules": {
        "semi": [
          "error",
          "never"
        ]
      }
    }
  ]
}