.eslintrc.json

{
  "root": true,
  "env": {
    "node": true,
    "es6": true
  },
  "parserOptions": {
    "ecmaVersion": 2020,
    "sourceType": "module"
  },
  "extends": ["plugin:import/recommended", "plugin:prettier/recommended"],
  "plugins": ["prettier", "import"],
  "rules": {
    // Custom import order
    "import/order": [
      "error",
      {
        "alphabetize": {
          "order": "asc",
          "caseInsensitive": true
        },
        "groups": ["builtin", "external", "internal", "unknown", "parent", "sibling", "index"],
        "newlines-between": "always"
      }
    ],

    // Missing imports
    "import/no-unresolved": "error",

    // File extensions
    "import/extensions": ["error", "never"],

    "no-shadow": "warn",

    "prettier/prettier": "error"
  },
  "overrides": [
    {
      "files": ["*.ts"],
      "extends": [
        "plugin:@typescript-eslint/recommended",
        "plugin:@typescript-eslint/recommended-requiring-type-checking"
      ],
      "parser": "@typescript-eslint/parser",
      "parserOptions": {
        "ecmaVersion": 2022,
        "project": true
      },
      "rules": {
        // Indentation is handled by prettier
        // https://github.com/typescript-eslint/typescript-eslint/issues/1824
        "@typescript-eslint/indent": "off",

        // Consistent use of type imports
        "@typescript-eslint/consistent-type-imports": "error",

        // Prefer interfaces for type definitions
        "@typescript-eslint/consistent-type-definitions": ["error", "interface"]
      }
    }
  ],
  "settings": {
    "import/resolver": {
      "typescript": {
        "alwaysTryTypes": true,
        "project": "."
      }
    }
  }
}