.eslintrc.json

{
  "env": { "node": true, "browser": true, "es2021": true },
  "parserOptions": { "ecmaVersion": 2022 },
  "overrides": [
    {
      "files": ["client/**/*.js"],
      "parserOptions": { "sourceType": "module" }
    }
  ],
  "rules": {
    "semi": ["error", "always"],
    "quotes": ["error", "single", { "avoidEscape": true, "allowTemplateLiterals": true }],
    "indent": ["error", 2, { "SwitchCase": 1 }],
    "no-unused-vars": ["error", { "argsIgnorePattern": "^_" }],
    "no-undef": "error",
    "no-const-assign": "error",
    "no-dupe-keys": "error",
    "no-duplicate-case": "error",
    "eqeqeq": ["error", "always"],
    "no-var": "error",
    "prefer-const": "error",
    "no-throw-literal": "error",
    "no-trailing-spaces": "error",
    "comma-dangle": ["error", "never"],
    "space-before-function-paren": ["error", { "anonymous": "always", "named": "never", "asyncArrow": "always" }]
  }
}