how to inject nix-node-dependencies

[hsjobeki]

Hey I am currently stuck with my problem:
I have a library packaged with the help of node2nix. (using rollup & typescript)

The Question:
In a project using that library, i want to use the packaged library.
How can i add the build output from that build (dist folder) to the node_modules generated by node2nix?

I dont want to use the npm registry or any private registry.

Is that currently supported ?

Just to make things clear: here is my build.nix step:

{ stdenv
, gitignoreSource
, package
, nodejs
, nodeDependencies
}:
stdenv.mkDerivation {
  src = gitignoreSource ../.;
  inherit (package) name;
  buildInputs = [ nodejs ];

  configurePhase = ''
    ln -s ${nodeDependencies}/lib/node_modules ./node_modules
    export PATH="${nodeDependencies}/bin:$PATH"
  '';

  buildPhase = ''
    npm run build
  '';

  installPhase = ''
    cp -r ./dist/ $out/
    cp package.json $out/
  '';
}