refactor(frontend): scripts -> utility

packages/frontend/src/utility/unison-reload.ts

@@ -0,0 +1,20 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+// SafariがBroadcastChannel未実装なのでライブラリを使う
+import { BroadcastChannel } from 'broadcast-channel';
+
+export const reloadChannel = new BroadcastChannel<string | null>('reload');
+
+// BroadcastChannelを用いて、クライアントが一斉にreloadするようにします。
+export function unisonReload(path?: string) {
+	if (path !== undefined) {
+		reloadChannel.postMessage(path);
+		location.href = path;
+	} else {
+		reloadChannel.postMessage(null);
+		location.reload();
+	}
+}