eslint.config.mjs

import { fixupConfigRules, fixupPluginRules } from "@eslint/compat";
import react from "eslint-plugin-react";
import jest from "eslint-plugin-jest";
import globals from "globals";
import babelParser from "@babel/eslint-parser";
import tseslint from "typescript-eslint";
import path from "node:path";
import { fileURLToPath } from "node:url";
import js from "@eslint/js";
import { FlatCompat } from "@eslint/eslintrc";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const compat = new FlatCompat({
  baseDirectory: __dirname,
  recommendedConfig: js.configs.recommended,
  allConfig: js.configs.all,
});

// Shared rules for both JS and TS files
const sharedRules = {
  "react/display-name": "off",
  "sort-imports": [
    "error",
    {
      ignoreCase: true,
      ignoreDeclarationSort: true,
      ignoreMemberSort: false,
      memberSyntaxSortOrder: ["none", "all", "multiple", "single"],
    },
  ],
  "import/order": [
    "error",
    {
      groups: ["builtin", "external", "internal", "parent", "sibling", "index"],
      pathGroups: [
        {
          pattern: "react",
          group: "external",
          position: "before",
        },
        {
          pattern: "src/**",
          group: "internal",
        },
      ],
      pathGroupsExcludedImportTypes: ["react"],
      "newlines-between": "never",
      alphabetize: {
        order: "asc",
        caseInsensitive: true,
      },
    },
  ],
  "react/jsx-sort-props": [
    "error",
    {
      callbacksLast: true,
      shorthandFirst: true,
      ignoreCase: true,
      reservedFirst: true,
    },
  ],
  "react/sort-prop-types": [
    "error",
    {
      callbacksLast: true,
      ignoreCase: true,
      sortShapeProp: true,
    },
  ],
  "prettier/prettier": [
    "error",
    {
      trailingComma: "es5",
    },
  ],
};

export default [
  {
    ignores: ["**/*.cjs"],
  },
  ...fixupConfigRules(
    compat.extends(
      "eslint:recommended",
      "plugin:react/recommended",
      "plugin:prettier/recommended",
      "plugin:import/errors",
      "plugin:import/warnings",
      "plugin:jsx-a11y/recommended",
      "plugin:react-hooks/recommended",
      "plugin:jest/recommended"
    )
  ),
  // JavaScript/JSX configuration
  {
    files: ["**/*.js", "**/*.jsx"],
    plugins: {
      react: fixupPluginRules(react),
      jest: fixupPluginRules(jest),
    },
    languageOptions: {
      globals: {
        ...globals.browser,
      },
      parser: babelParser,
      ecmaVersion: 12,
      sourceType: "module",
      parserOptions: {
        ecmaFeatures: {
          jsx: true,
        },
      },
    },
    settings: {
      react: {
        version: "detect",
      },
      "import/resolver": {
        node: {
          extensions: [".js", ".jsx", ".ts", ".tsx", ".json"],
        },
        alias: {
          map: [["src", "./src"]],
          extensions: [".ts", ".tsx", ".js", ".jsx", ".json"],
        },
      },
    },
    rules: sharedRules,
  },
  // TypeScript/TSX configuration
  ...tseslint.configs.recommended.map((config) => ({
    ...config,
    files: ["**/*.ts", "**/*.tsx"],
  })),
  {
    files: ["**/*.ts", "**/*.tsx"],
    plugins: {
      react: fixupPluginRules(react),
      jest: fixupPluginRules(jest),
    },
    languageOptions: {
      globals: {
        ...globals.browser,
        ...globals.jest,
      },
      parser: tseslint.parser,
      parserOptions: {
        ecmaFeatures: {
          jsx: true,
        },
      },
    },
    settings: {
      react: {
        version: "detect",
      },
      "import/resolver": {
        node: {
          extensions: [".js", ".jsx", ".ts", ".tsx", ".json"],
        },
        alias: {
          map: [["src", "./src"]],
          extensions: [".ts", ".tsx", ".js", ".jsx", ".json"],
        },
      },
    },
    rules: {
      ...sharedRules,
      // TypeScript specific rules
      "@typescript-eslint/no-unused-vars": [
        "error",
        { argsIgnorePattern: "^_", varsIgnorePattern: "^_" },
      ],
      "@typescript-eslint/no-explicit-any": "warn",
      "@typescript-eslint/no-non-null-assertion": "off",
      // Disable base rules that are handled by TypeScript
      "no-unused-vars": "off",
      "no-undef": "off",
      // Disable prop-types for TypeScript (TS handles this)
      "react/prop-types": "off",
    },
  },
];