result.stdio and error.stdio.

[ehmicky]

We currently return the child process' stdout and stderr, as a property to the result and error objects.
We could do the same for the other file descriptors (3, 4, etc.), using childProcess.stdio. This would useful to any users writing to custom file descriptors.

It would behave just like stdout and stderr when it comes to buffering and encoding. It would in fact mostly use the same existing underlying logic, so the implementation would be fairly lightweight.

Just like stdout and stderr, it would be undefined when using inherit, ignore, ipc, etc. since those do leave childProcess.stdio[*] as null.

childProcess.spawnSync() actually does exactly this.

What do you think @sindresorhus?

[sindresorhus]

👍

[ehmicky]

Done in #676.