chore(lint-staged): convert configs to ts

This migrates lint-staged and commitlint configurations to TypeScript and updates Biome include patterns.

The changes improve type safety and ensure Biome checks the config files while keeping the ignored path behavior consistent.

Author: asyrjasalo

biome.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://biomejs.dev/schemas/2.4.10/schema.json",
   "files": {
-    "includes": ["**/*.ts", "**/*.js", "**/*.json", "!.pi"]
+    "includes": ["**/*.ts", "**/*.js", "**/*.json", "*.config.ts", "!.pi"]
   },
   "linter": {
     "enabled": true,

commitlint.config.js commitlint.config.tscommitlint.config.js renamed to commitlint.config.ts

@@ -1,7 +1,11 @@
-export default {
+import type { UserConfig } from '@commitlint/types';
+
+const config: UserConfig = {
   extends: ['@commitlint/config-conventional'],
   rules: {
     // Allow longer body lines (e.g. full sentences) without manual wrapping.
     'body-max-line-length': [0],
   },
 };
+
+export default config;

lint-staged.config.mjs

@@ -0,0 +1,22 @@
+/** Path segments Biome ignores (see biome.json files.includes). */
+const BIOME_IGNORED_SEGMENTS = new Set(['.pi']);
+
+function isBiomeIgnoredPath(filePath: string): boolean {
+  return filePath
+    .replace(/\\/g, '/')
+    .split('/')
+    .some((segment) => BIOME_IGNORED_SEGMENTS.has(segment));
+}
+
+const config = {
+  '*.{ts,js,json}': (files: readonly string[]) => {
+    const toLint = files.filter((f) => !isBiomeIgnoredPath(f));
+    if (toLint.length === 0) return [];
+    return `biome check --write ${toLint.join(' ')}`;
+  },
+  '*.{js,ts,json,md,yaml,yml,toml,css,html}': (files: readonly string[]) => {
+    return `secretlint ${files.join(' ')}`;
+  },
+};
+
+export default config;