Support for exporting chats to disk

ts/util/getFreeDiskSpace.node.ts

@@ -0,0 +1,9 @@
+// Copyright 2025 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import { statfs } from 'node:fs/promises';
+
+export async function getFreeDiskSpace(target: string): Promise<number> {
+  const { bsize, bavail } = await statfs(target);
+  return bsize * bavail;
+}