{
  description = "Advent of Code solutions in C#";
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    flake-utils.url = "github:numtide/flake-utils";
  };

  outputs = { self, nixpkgs, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs {
          system = system;
          config.allowUnfree = true;
        };

        # to generate the deps.json, first
        # run `dotnet restore --packages out` which
        # will put all the dependencies in the "out" directory.
        # Second, run `nuget-to-json out > deps.json` to generate the
        # deps.json
        project = pkgs.buildDotnetModule {
          pname = "adventOfCode";
          version = "0.1.0";
          src = ./.;
          nugetDeps = ./deps.json;
          projectFile = "adventOfCode/adventOfCode.csproj";
          dotnetBuildFlags = [ "--no-self-contained" ];
          dotnet-sdk = pkgs.dotnetCorePackages.sdk_10_0;
          dotnet-runtime = pkgs.dotnetCorePackages.aspnetcore_10_0;
        };

      in {
        packages = { project = project; };
        devShells.default = pkgs.mkShell {
          buildInputs = [ pkgs.dotnet-sdk_10 pkgs.nuget-to-json ];
        };
      });
}