router.broadcast() needs the BroadcastChannel API, which this runtime does not provide; cross-tab mirroring is off.

Warnings reference › data-router:no-broadcastchannel

Identifier

data-router:no-broadcastchannel

Raised by

Data Router

Since

1.33.0

What happened

Cross-tab mirroring uses BroadcastChannel, and this runtime has none. No channel was opened; the router behaves exactly as a router that never called broadcast(), so other tabs will not see this one's deltas.

The fix

Nothing, in a runtime without the API. In a browser that has it, check that the call is not running in a worker or a context where the global has been removed.

Reference

Covered in full at the API reference.