refactor(frontend): scripts -> utility

packages/frontend/src/utility/initialize-sw.ts

@@ -0,0 +1,18 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { lang } from '@@/js/config.js';
+
+export async function initializeSw() {
+	if (!('serviceWorker' in navigator)) return;
+
+	navigator.serviceWorker.register('/sw.js', { scope: '/', type: 'classic' });
+	navigator.serviceWorker.ready.then(registration => {
+		registration.active?.postMessage({
+			msg: 'initialize',
+			lang,
+		});
+	});
+}