usage with flakes

[Suya1671]

How can I use this with a nix flake?

[stephank]

It's pretty much the same as the generated default.nix, but inside a flake package:

{
  outputs = { self, nixpkgs }: with nixpkgs.lib; {
    packages = mapAttrs (system: pkgs: {
      default = pkgs.callPackage ./yarn-project.nix { } { src = ./.; };
    }) nixpkgs.legacyPackages;
  };
}