declare function listenWalkerOnce(filterFn: (event: WalkerContract) => boolean, fn: (event: WalkerContract) => void): () => void;
Subscribes to filtered walker progress events with one-time execution.
Listens for events matching the filter predicate, then executes callback once and automatically unsubscribes. Useful for waiting for specific walker conditions.
| Parameter | Description |
|---|---|
filterFn |
Predicate to filter which events trigger the callback |
fn |
Callback function to handle the filtered event (called only once) |