Second on dream2nix. I’ve used it extensively to package extremely complex yarn-based monorepos with workspaces and a variety of other off use cases, with close to 100% success rate with nodejs-based packages. The nodejs ecosystem is pretty much solved for dream2nix. It has support for both pure (package-lock.json, yarn.lock) and impure translations and provides many paths to solve various problems, such as package overrides, dependency injections, building without devDependencies (so build from the outside with nix instead), etc.