.eslintrc.json

{
  "extends": ["xo", "prettier"],
  "parser": "@typescript-eslint/parser",
  "plugins": ["@typescript-eslint", "node", "unicorn", "prettier"],
  "env": {
    "node": true,
    "es2022": true
  },
  "parserOptions": {
    "ecmaVersion": "latest",
    "sourceType": "module"
  },
  "rules": {
    "default-param-last": "off",
    "padding-line-between-statements": "off",
    "no-eq-null": "off",
    "node/no-extraneous-import": ["error", {
      "allowModules": ["@jest/globals"]
    }],
    "eqeqeq": [
      "error",
      "always",
      {
        "null": "ignore"
      }
    ],
    "prettier/prettier": "error",
    "unicorn/prefer-module": "error",
    "unicorn/prefer-node-protocol": "error"
  },
  "overrides": [
    {
      "files": ["*.ts"],
      "rules": {
        // Disabled per typescript-eslint recommendation: https://github.com/typescript-eslint/typescript-eslint/blob/e26e43ffba96f6d46198b22f1c8dd5c814db2652/docs/getting-started/linting/FAQ.md#i-get-errors-from-the-no-undef-rule-about-global-variables-not-being-defined-even-though-there-are-no-typescript-errors
        "no-undef": "off",
        "no-unused-vars": "off",
        "@typescript-eslint/no-unused-vars": "error"
      }
    },
    {
      "files": ["*.js"],
      "rules": {
        "node/file-extension-in-import": "error",
        "node/no-missing-import": "error",
        "node/no-extraneous-import": "error"
      }
    },
    {
      "files": ["test.js", "*.test.js", "**/test/**"],
      "env": {
        "mocha": true,
        "jest": true
      }
    }
  ]
}