29 lines
1.3 KiB
TypeScript
29 lines
1.3 KiB
TypeScript
 
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import { MatrixClient, ReceiptType, Thread } from 'matrix-js-sdk';
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/**
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* Send a threaded read receipt for a thread, clearing its per-thread unread
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* count.
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*
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* CRITICAL: never receipt the thread ROOT. A thread's liveTimeline is
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* `[root, reply1, …]`, so the latest event IS the root when replies aren't
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* loaded yet (common — the thread panel fires this on mount before replies
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* fetch). The root is "in the main timeline", so a receipt for it is written by
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* the SDK with `thread_id:"main"` at the old root, dragging the room's MAIN read
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* marker backwards (`getEventReadUpTo` → an old/unloaded event) and re-lighting
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* the whole room. We only receipt a genuine loaded reply (`thread.lastReply()`);
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* if none is loaded we bail (the per-thread count clears when the reply loads
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* and this runs again). Mirrors the root guard in `utils/notifications.ts`.
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*
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* Pure (no React/CSS) so it can be unit-tested — see `threadReceipt.test.ts`.
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*/
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export const markThreadAsRead = async (
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mx: MatrixClient,
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thread: Thread,
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privateReceipt: boolean,
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): Promise<void> => {
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const lastReply = thread.lastReply();
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if (!lastReply || lastReply.isSending() || lastReply.getId() === thread.id) return;
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await mx.sendReadReceipt(lastReply, privateReceipt ? ReceiptType.ReadPrivate : ReceiptType.Read);
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};
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