How to add parameter to devenv.nix?

[tennox]

I like to use a nixpkgs channel for most packages, but for some, I want the latest version, so I've added an extra input.
Now I'd like to have that available in devenv.nix as:

{ pkgs, pkgs-latest, ... }:

When I used to import the file manually I could do it:

let
    pkgs = nixpkgs.legacyPackages.${system};
    pkgs-latest = inputs.nixpkgs-unstable.legacyPackages.${system};
in {
    devenv.shells.default = (import ./devenv.nix { inherit pkgs pkgs-latest inputs config; });

But recently I needed to access config.env.DEVENV_ROOT so I had to change it to:

devenv.shells.default = {
  imports = [ ./devenv.nix ];
};

Which I guess is better anyways, but now I don't know how to get the pkgs-latest passed into there 🤔

[tennox]

I'm in a flake with flake-parts, and tried some things, but not successfully so (see the commented parts):

      imports = [
        inputs.devenv.flakeModule
        ({ lib, config, ... }: {
          config = {
            # devenv.modules = [
            #   ({ inputs', ... }: { pkgs-latest = inputs'.nixpkgs-unstable.legacyPackages; })
            # ];
          };
        })
      ];
      perSystem = { config, self', inputs', pkgs, system, ... }: # perSystem docs: https://flake.parts/module-arguments.html#persystem-module-parameters
        let
          pkgs = nixpkgs.legacyPackages.${system};
          latest = inputs'.nixpkgs-unstable.legacyPackages;
        in
        {
          # devenv.shells.default = (import ./devenv.nix { inherit pkgs latest inputs config; });
          devenv.shells.default = {
            imports = [
              # ({ config, ... }: { config.pkgs-latest = inputs'.nixpkgs-unstable.legacyPackages; })
              ./devenv.nix
            ];
          };
        };

[domenkozar]

https://devenv.sh/common-patterns/#getting-a-recent-version-of-a-package-from-nixpkgs-unstable