PatchMessage
@rotorsoft/act-root / act-http/src/sse / PatchMessage
Type Alias: PatchMessage<S>
PatchMessage<
S> =Record<number,DeepPartial<S>> &object
Defined in: libs/act-http/src/sse/types.ts:31
SSE message: version-keyed domain patches. Keys are stringified version numbers, values are domain patches (deep partials). Multi-event commits produce multiple version-keyed entries.
The optional _overlay marker flags a version-neutral update (presence,
computed-field refresh) emitted by BroadcastChannel.overlay — a
single entry keyed at the current version. It tells applyPatchMessage
to merge the entry on top of the client's caught-up state instead of
rejecting it as stale (a same-version patch WITHOUT the marker stays
stale). Ordinary version-bumping patches from publish() omit it.
_resync carries no versions at all. The server emits it when it cannot
construct a patch — today, when overlay() finds the stream's baseline
evicted from the LRU. A client that receives one always reports behind
and refetches. Without it the server had nothing to say in that case, so
live subscribers silently stopped receiving presence updates and had no
way to notice (#1423).
Type Declaration
_overlay?
readonlyoptional_overlay?:true
_resync?
readonlyoptional_resync?:true
Type Parameters
S
S extends BroadcastState = BroadcastState