well, yea

isnt there any occurances of this in nixpkgs?

signal-desktop = (lib.makeOverridable (
  { theme ? null }:
  signal-desktop.overrideAttrs (prev: {
    nativeBuildInputs = prev.nativeBuildInputs ++ [ asar ];
    preFixup = lib.optionalString (theme != null) ''
      asar e $out/share/signal-desktop/app.asar resources
      sed -i '1i @import "${theme}";' resources/stylesheets/manifest.css
      asar p --unpack '*.node' resources $out/share/signal-desktop/app.asar
    '';
  })
)) { };

works but build errors with a very weird error?

error:
       … while setting up the build environment

       error: getting attributes of path '/nix/store/ybm0fkyc9v0vy3ijnrg52a9w2d3g1rna-signal-desktop-7.76.0': No such file or directory

I just guess I needed to add

mkdir -p $out/share/signal-desktop
``

I just guess I needed to add

mkdir -p $out/share/signal-desktop

       error: attribute 'wasm32-wasi' missing
       at /nix/store/lfzp7i6r926pwszqyr8r4igvakxw59kh-source/overlays/default.nix:85:47:
           84|                 ]
           85|               ) inputs.nixpkgs.legacyPackages.${system}.lixPackageSets.git
             |                                               ^
           86|             )

my

packages = { ... }         // (lib.listToAttrs (
          lib.mapAttrsToList
            (name: value: {
              name = { lix = "nix"; }.${name} or name;
              inherit value;
            })
            (
              lib.filterAttrs (
                name: value:
                lib.isDerivation value
                && lib.all (n: name != n) [
                  "editline"
                  "boehmgc"
                ]
              ) inputs.nixpkgs.legacyPackages.${system}.lixPackageSets.git
            )

my

packages = { ... } // (lib.listToAttrs (
          lib.mapAttrsToList
            (name: value: {
              name = { lix = "nix"; }.${name} or name;
              inherit value;
            })
            (
              lib.filterAttrs (
                name: value:
                lib.isDerivation value
                && lib.all (n: name != n) [
                  "editline"
                  "boehmgc"
                ]
              ) inputs.nixpkgs.legacyPackages.${system}.lixPackageSets.git
            )