Transpiling typescript in a derivation

Elyhaka · March 15, 2020, 5:05pm

I’m currently working on building a derivation for the Pop_OS! Shell (it’s still a WIP in upstream).

This software uses typescript, and it must be transpiled to javascript in order to be installed on gnome.

I cannot figure out how I am supposed to add tsc in the nativeBuildInputs of this derivation, and I would love to have some hints on how I could manage to this ?

Thank you very much !

Elyhaka · March 15, 2020, 5:22pm

Found it in nodePackages.typescript but I’m not sure why it is not shown in nix search typescript.

jtojnar · March 15, 2020, 5:31pm

tsc is part of nodePackages.typescript.

jtojnar · March 15, 2020, 5:45pm

It is marked to prevent recursing into the attributes:

https://github.com/NixOS/nixpkgs/blob/f13d9f2704cdd5ee49cf80f6514f5baf9eb9f2ac/pkgs/top-level/all-packages.nix#L4602

Elyhaka · March 15, 2020, 5:45pm

Didn’t know this existed, thank you !

jtojnar · March 15, 2020, 6:07pm

That is actually the default behaviour. dontRecurseIntoAttrs is ~~just an identity~~ function created to contrast with recurseIntoAttrs:

github.com

NixOS/nixpkgs/blob/ad81f84d1f070e370955ffbe87cc21ae1b41215b/lib/attrsets.nix#L476-L488

    
      
          /* Make various Nix tools consider the contents of the resulting
             attribute set when looking for what to build, find, etc.
          
          
   This function only affects a single attribute set; it does not
             apply itself recursively for nested attribute sets.
           */
          recurseIntoAttrs =
            attrs: attrs // { recurseForDerivations = true; };
          
          
/* Undo the effect of recurseIntoAttrs.
           */
          dontRecurseIntoAttrs =
            attrs: attrs // { recurseForDerivations = false; };

Edit: Since https://github.com/NixOS/nixpkgs/commit/fc64cf65abfd6f42910a639f7ffb996788a95797, it is not an identity any more.