For the sync methods spawnSync(), execSync() and execFileSync(), when
the stdio option is set to anything other than 'pipe', the stdout and
stderr returned from the C++ code will be null, and not a string or
Buffer as currently documented.
PR-URL: https://github.com/nodejs/node/pull/58575
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: James M Snell <jasnell@gmail.com>