[Macha]

If they do need to be sourced, you can use bass: https://github.com/edc/bass

[breatheoften]

Wow this is neat — I’m gonna try this out. Does it really work?

[Macha]

It works at least for nvm (caveat: Installed from nvm directly, not homebrew), and my company's ssh setup script, which are the two reasons I've had cause to use it.