eslint.config.js

import eslint from "@eslint/js";
import tseslint from "typescript-eslint";
import eslintConfigPrettier from "eslint-config-prettier";

export default tseslint.config(
  eslint.configs.recommended,
  ...tseslint.configs.strictTypeChecked,
  ...tseslint.configs.stylisticTypeChecked,
  eslintConfigPrettier,
  {
    languageOptions: {
      parserOptions: {
        project: "./tsconfig.eslint.json",
        tsconfigRootDir: import.meta.dirname,
      },
    },
    rules: {
      // Strict: no any allowed
      "@typescript-eslint/no-explicit-any": "error",
      "@typescript-eslint/no-unsafe-assignment": "error",
      "@typescript-eslint/no-unsafe-member-access": "error",
      "@typescript-eslint/no-unsafe-call": "error",
      "@typescript-eslint/no-unsafe-return": "error",
      "@typescript-eslint/no-unsafe-argument": "error",

      // Require explicit return types on functions
      "@typescript-eslint/explicit-function-return-type": [
        "error",
        {
          allowExpressions: true,
          allowTypedFunctionExpressions: true,
        },
      ],

      // Require explicit accessibility modifiers
      "@typescript-eslint/explicit-member-accessibility": [
        "error",
        { accessibility: "no-public" },
      ],

      // Prefer nullish coalescing
      "@typescript-eslint/prefer-nullish-coalescing": "error",

      // Consistent type imports
      "@typescript-eslint/consistent-type-imports": [
        "error",
        { prefer: "type-imports" },
      ],

      // No floating promises
      "@typescript-eslint/no-floating-promises": "error",

      // Strict boolean expressions
      "@typescript-eslint/strict-boolean-expressions": "off", // Too strict for practical use

      // Allow void for fire-and-forget promises in specific cases
      "@typescript-eslint/no-confusing-void-expression": [
        "error",
        { ignoreArrowShorthand: true },
      ],
    },
  },
  {
    // Relaxed rules for test files
    files: ["**/*.test.ts", "**/*.integration.test.ts"],
    rules: {
      "@typescript-eslint/no-unsafe-member-access": "off",
      "@typescript-eslint/no-unsafe-call": "off",
      "@typescript-eslint/no-unsafe-assignment": "off",
      "@typescript-eslint/no-unsafe-return": "off",
      "@typescript-eslint/no-explicit-any": "off",
      "@typescript-eslint/no-unsafe-argument": "off",
      "@typescript-eslint/unbound-method": "off",
      "@typescript-eslint/require-await": "off",
      "@typescript-eslint/no-require-imports": "off",
      "@typescript-eslint/restrict-template-expressions": "off",
    },
  },
  {
    ignores: ["dist/**", "node_modules/**", "*.js", "*.cjs", "*.mjs"],
  }
);