[soraminazuki]

You could do something like:

    let pinnedPkgs = import (builtins.fetchTarball {...}) {};
        node = pinnedPkgs.nodejs-10_x;

to refer to a specific version of node.

https://nixos.wiki/wiki/FAQ/Pinning_Nixpkgs

[silviogutierrez]

Thanks that helps.

I've mostly stuck to nix-shell -p foo bar baz to setup my environments. It's holding me back and I should pull the trigger on a shell.nix file, just gotta learn the language.