Function autoKillOnExit

autoKillOnExit(child: ChildProcess, signal?: Signals): () => void
Register cleanup handler to kill an ffmpeg process when the Node.js process exits. Returns an unregister function — call it once the ffmpeg process finishes normally.

Listens to process exit, SIGINT, and SIGTERM only. Does NOT listen to uncaughtException to avoid suppressing error reporting.
Parameters
- child: ChildProcess
- signal: Signals = 'SIGTERM'
Returns () => void
Example
```
const proc = ffmpeg('input.mp4').output('out.mp4').spawn();
const unregister = autoKillOnExit(proc.child);
proc.emitter.on('end', () => unregister());
```
- Defined in src/helpers/process.ts:52