Type Alias: StdioOption

StdioOption = ExecStdio | LineHandler | "capture" | (LineHandler | "capture")[]

Stdio config for one fd.

• "inherit" / "pipe" / "ignore" — pass through to spawn
• "capture" — pipe the fd and append each line to the result
• LineHandler — pipe and invoke the handler per line (lines are still captured)
• (LineHandler | "capture")[] — pipe; "capture" is a no-op marker, handlers run per line