Function listenSignalBacktest

listenSignalBacktest(fn: (event: IStrategyTickResult) => void): () => void
Subscribes to backtest signal events with queued async processing.

Only receives events from Backtest.run() execution. Events are processed sequentially in order received.
Parameters
- fn: (event: IStrategyTickResult) => void
  Callback function to handle backtest signal events
Returns () => void
Unsubscribe function to stop listening
Example
```
import { listenSignalBacktest } from "./function/event";

const unsubscribe = listenSignalBacktest((event) => {
  if (event.action === "closed") {
    console.log("Backtest signal closed:", event.pnl.pnlPercentage);
  }
});
```
- Defined in types.d.ts:2919