As far as I know there are channels with nix-expressions (which are the package definitions), which are descriptions of how gather the source-code or binaries from specific URLs.<p>npm2nix for example only uses npm to gather the the packages from the registry, but uses Nix for all the other stuff. [0]<p>[0]: <a href="http:&#x2F;&#x2F;sandervanderburg.blogspot.de&#x2F;2014&#x2F;10&#x2F;deploying-npm-packages-with-nix-package.html" rel="nofollow">http:&#x2F;&#x2F;sandervanderburg.blogspot.de&#x2F;2014&#x2F;10&#x2F;deploying-npm-pa...</a>