doorbell-matrix-bot/flake.nix

{
  description = "PVV doorbell matrix bot";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils, ... }@inputs:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        node-modules = pkgs.mkYarnPackage {
          name = "node-modules";
          src = ./.;
        };
        frontend = pkgs.stdenv.mkDerivation {
          name = "frontend";
          src = ./.;
          buildInputs = [pkgs.yarn node-modules];
          buildPhase = ''
            ln -s ${node-modules}/libexec/pvv-doorbell-bot/node_modules node_modules
            ${pkgs.yarn}/bin/yarn build
          '';
          installPhase = ''
            mkdir $out
            mv dist $out/lib
          '';
        };
      in {
        packages = {
          node-modules = node-modules;
          default = frontend;
        };
      }
    );
}