BroadcastActions

useBroadcastChannel returns this object; useBroadcastProvider reads the same shape from context.

Member	Type	Description
channelName	string	Resolved channel name, including the namespace.
messages	BroadcastMessage[]	Received messages (the log). Empty in a late-joining tab until something arrives.
sentMessages	BroadcastMessage[]	Messages this tab sent.
isPingInProgress	boolean	true while a ping() is collecting answers.
error	string | null	Set when the browser lacks BroadcastChannel or the channel fails.
postMessage	(type: string, content: any, options?: SendMessageOptions) => void	Send to every other tab on the channel.
ping	(timeoutMs?: number) => Promise<string[]>	Discover other tabs on the channel; resolves to their source names (yours excluded).
getLatestMessage	(options?: { type?: string; source?: string }) => BroadcastMessage | null	Most recent received message, optionally filtered. null when nothing matches.
clearReceivedMessages	(options?: ClearReceivedMessagesOptions) => void	Clear the received log, optionally by types, sources, or ids.
clearSentMessages	(options?: ClearSentMessagesOptions) => void	Clear the sent log. sync: true also clears the other tabs’ received copies.
closeChannel	() => void	Close the channel and remove listeners. Idempotent; automatic on unmount.

getLatestMessage

const latest = getLatestMessage();
const latestAlert = getLatestMessage({ type: 'alert' });
const latestFromTab2 = getLatestMessage({ type: 'info', source: 'tab-2' });

Returns the most recently received matching message, or null. Note that in a late-joining tab the log starts empty, so this is null until something arrives.

closeChannel

Use for manual cleanup only: after it, the channel sends and receives nothing. Safe to call repeatedly. You do not need it for normal unmounting.