ESLint Strict Config

1// eslint.config.mjs
2import { dirname } from "path";
3import { fileURLToPath } from "url";
4import { FlatCompat } from "@eslint/eslintrc";
5import tseslint from "typescript-eslint";
6
7const __filename = fileURLToPath(import.meta.url);
8const __dirname = dirname(__filename);
9const compat = new FlatCompat({ baseDirectory: __dirname });
10
11export default tseslint.config(
12  ...compat.extends("next/core-web-vitals", "next/typescript"),
13  {
14    rules: {
15      // TypeScript strict rules
16      "@typescript-eslint/no-explicit-any": "error",
17      "@typescript-eslint/no-unused-vars": [
18        "error",
19        {
20          argsIgnorePattern: "^_",
21          varsIgnorePattern: "^_",
22        },
23      ],
24      "@typescript-eslint/consistent-type-imports": [
25        "error",
26        { prefer: "type-imports" },
27      ],
28      "@typescript-eslint/no-non-null-assertion": "error",
29
30      // General best practices
31      "no-console": ["warn", { allow: ["warn", "error"] }],
32      "no-debugger": "error",
33      "prefer-const": "error",
34      "no-var": "error",
35      eqeqeq: ["error", "always"],
36      curly: ["error", "all"],
37
38      // React rules
39      "react/self-closing-comp": "error",
40      "react/jsx-no-leaked-render": "error",
41      "react-hooks/exhaustive-deps": "error",
42
43      // Import rules
44      "import/no-duplicates": "error",
45      "import/no-cycle": "error",
46      "import/first": "error",
47    },
48  },
49  {
50    ignores: [
51      "node_modules/**",
52      ".next/**",
53      "dist/**",
54      "coverage/**",
55    ],
56  }
57);