[Feature Request] Show node version for JS-specific folders

[d3lm]

It would be great if we could also show the node version only for JS-specific folders that maybe contain a package.json or node_modules. When switching the working tree the information in the prompt should be updated accordingly. Here's an example of what I am imagining:

I have implemented this locally and would be willing to send my changes as a PR. However, I am not sure if it's the proper way of implementing it because I personally don't have that much experience with bash programming. But I'd love to get this in and get your feedback on my implementation. I was mostly inspired by how the git stuff is done asynchronously.

[sindresorhus]

Yeah, would be useful. We're looking into how to be able to do this in a more modular way to make it easier for people to enable/disable certain part, like this and even make their own: #460

[sindresorhus]

Duplicate of #503

[sindresorhus]

^ You should comment there instead.