Function runSpawnWithCancel

runSpawnWithCancel(
    command: string,
    args: readonly string[],
    label: string,
    options?: {
        onStderrChunk?: (chunk: string) => void;
        onStdoutChunk?: (chunk: string) => void;
        isCancelled?: () => Promise<boolean>;
    },
): Promise<void>
Runs a subprocess and optionally polls for import-job cancellation, killing the child with SIGTERM when the job is cancelled.
Parameters
- command: string
  Executable name or path.
- args: readonly string[]
  Argument vector.
- label: string
  Human-readable label for error messages.
- Optionaloptions: {
      onStderrChunk?: (chunk: string) => void;
      onStdoutChunk?: (chunk: string) => void;
      isCancelled?: () => Promise<boolean>;
  }
  Optional stdout/stderr handlers and cancellation polling callback.
Returns Promise<void>
Resolves when the child exits zero; rejects on failure or cancellation.
- Defined in lib/youtube-import/spawn-with-cancel.ts:30