declare function listenSyncOnce(filterFn: (event: OrderSyncContract) => boolean, fn: (event: OrderSyncContract) => void, warned?: boolean): () => void;
Subscribes to filtered signal synchronization events with one-time execution. This is an order GATE: a throw from the listener rejects the open/close — see listenSync for the full throw semantics (plain Error / OrderTransientError = bounded "transient" retry, OrderRejectedError = terminal at once, OrderDeletedError = protocol violation → transient).
| Parameter | Description |
|---|---|
filterFn |
Predicate to filter which events trigger the callback |
fn |
Callback function to handle the filtered event (called only once). If the function returns a promise, signal processing will wait until it resolves. |
warned |