EmitSync Flow

TriggerSync fires an event and blocks until all matched runs finish or the wait budget expires. It subscribes directly to the NATS RESULTS stream using raw NATS — not a JetStream consumer — so there is nothing to ack. The subscription opens before dispatch, so a run that finishes immediately is never missed.

When the wait budget expires (30s by default), the handler reads each run from the database. A terminal row becomes a complete result. A non-terminal row retains its actual status and returns waitTimedOut: true; the durable run continues. If the NATS subscription cannot be created at all, the handler polls the database under the same budget.

emitSync() returns one result per matched run — EmitSyncResult[] in JavaScript, []EmitSyncResult in Go — and an event that matches nothing returns an empty list. For a single function by ID, InvokeFunctionSync is the one-run counterpart (ADR 0067). A function with debounce configured rejects TriggerSync: use the async Emit Flow instead.