listenDoneBacktestOnce

declare function listenDoneBacktestOnce(filterFn: (event: DoneContract) => boolean, fn: (event: DoneContract) => void): () => void;
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Subscribes to filtered backtest background execution completion events with one-time execution.

Emits when Backtest.background() completes execution. Executes callback once and automatically unsubscribes.

Parameters

Parameter	Description
filterFn	Predicate to filter which events trigger the callback
fn	Callback function to handle the filtered event (called only once)