fix: fall back to nodejs-slim.src when nodejs.src is absent

[cameronraysmith]

NixOS/nixpkgs#481461 restructured nodejs_* from mkDerivation to symlinkJoin over nodejs-slim_*, dropping the src attribute. This breaks

playwright-web-flake/playwright-test/node-env.nix

Line 211 in f6342a8

tar --no-same-owner --no-same-permissions -xf ${nodejs.src}

which extracts node sources for native binding compilation via --nodedir.

nodejs.src or pkgs.nodejs-slim.src works on nixpkgs revisions predating the change and resolves the missing attr on current nixpkgs-unstable.

[thunze]

It's a bummer that playwright-web-flake doesn't expose an overlay, otherwise the same workaround could have been easily applied in downstream flakes via overlays.

Nevermind, this seems to work as an overlay:

overlay = final: prev: {
  nodejs = prev.nodejs // {
    inherit (prev.nodejs-slim) src;
  };
  playwright-driver = final.callPackage "${playwright}/playwright-driver" { };
  playwright-test = final.callPackage "${playwright}/playwright-test/wrapped.nix" { };
};

Although it would probably still be better if playwright-web-flake just exposed an overlay because then we didn't have to replicate the callPackage logic.

[bitbloxhub]

With #18, it looks like this is not relevant anymore as it removes this bit of code entirely.