[strobe]

In most cases is enough to have emacs installed as part of OS with all required general cli tools and then open project specific shell with all project dev dependencies like compilers and libs.

However is some cases when it could be little more tricky, for instance I'm using LSP for Scala (https://scalameta.org/metals/) which on start trying to automatically detect JDK version for project from environment. So if my project depends on JDK 11 it might required for me manually start LSP from nix-shell to force it use right JVM version.

With Rust is in someway similar, I need to bring some shell with 'rust up' setup so it could install everything for rust-analyzer then emacs can use it.

Regardless emacs itself is few options to manage emacs packages in nix way but for me it not really gives anything so I just use it as on any other OS.