eslint.config.mjs

import { fixupConfigRules, fixupPluginRules } from "@eslint/compat";
import { FlatCompat } from "@eslint/eslintrc";
import js from "@eslint/js";
import typescriptEslint from "@typescript-eslint/eslint-plugin";
import tsParser from "@typescript-eslint/parser";

import react from "eslint-plugin-react";
import reactHooks from "eslint-plugin-react-hooks";
import globals from "globals";
import path from "node:path";
import { fileURLToPath } from "node:url";

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,
});

export default [
  ...fixupConfigRules(
    compat.extends(
      "eslint:recommended",
      "plugin:@typescript-eslint/recommended",
      "plugin:react/recommended",
      "plugin:react-hooks/recommended",
      "plugin:react/jsx-runtime",
    ),
  ),
  {
    plugins: {
      "@typescript-eslint": fixupPluginRules(typescriptEslint),
      react: fixupPluginRules(react),
      "react-hooks": fixupPluginRules(reactHooks),
    },

    languageOptions: {
      globals: {
        ...globals.node,
      },

      parser: tsParser,
      ecmaVersion: 2018,
      sourceType: "module",

      parserOptions: {
        ecmaFeatures: {
          jsx: true,
        },

        project: [
          "./tsconfig.json",
          "./client/tsconfig.json",
          "./server/tsconfig.json",
        ],
      },
    },

    settings: {
      react: {
        version: "detect",
      },
    },

    rules: {
      eqeqeq: "error",
      "prefer-const": "error",
      "@typescript-eslint/dot-notation": "error",
      "@typescript-eslint/no-unused-vars": "error",

      "@typescript-eslint/consistent-type-assertions": [
        "error",
        {
          assertionStyle: "never",
        },
      ],
      "@typescript-eslint/no-unused-expressions": "off",

      curly: "error",
    },
  },
];