cross-tab-sync

Cross-Tab Sync

Mirrors state across browser tabs in real time over BroadcastChannel — theme, auth status, a cache revision, and a shared draft all stay in sync between every open tab of the app.

What it shows

• Publishing and subscribing to named channels via the interop BroadcastChannel binding.
• Typed signals (JSON-encoded structs) per channel, so each concern syncs independently.
• The same-origin, no-server sync substrate that the durable kvstate layer uses for its cross-tab watch.

Run

gwc dev examples/public/cross-tab-sync

Open the page in two tabs and change the theme or draft in one — the other updates immediately.