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