Function listenExit

  • listenExit(fn: (error: Error) => void): () => void

    Subscribes to fatal execution errors with queued async processing.

    Listens to critical errors that terminate execution (Live.background, Backtest.background, Walker.background). Unlike listenError (recoverable errors), these errors stop the current process. Events are processed sequentially in order received, even if callback is async. Uses queued wrapper to prevent concurrent execution of the callback.

    Parameters

    • fn: (error: Error) => void

      Callback function to handle fatal error events

    Returns () => void

    Unsubscribe function to stop listening

    Example

    import { listenExit } from "./function/event";

    const unsubscribe = listenExit((error) => {
      console.error("Fatal error (execution terminated):", error.message);
      // Log to monitoring, send alerts, restart process, etc.
    });

    // Later: stop listening
    unsubscribe();

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