{
  description = "A very basic flake";

  inputs = {
    utils.url = github:numtide/flake-utils;
    rust-overlay.url = "github:oxalica/rust-overlay";
  };

  outputs = { self, nixpkgs, utils, rust-overlay }: utils.lib.eachDefaultSystem (
    system:
    let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [ rust-overlay.overlay ];
      };
      rust = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
    in
    {

      checks.ci = pkgs.stdenv.mkDerivation {
        name = "ci";

        src = ./.;

        buildInputs = with pkgs;
          [
            rust
            nodejs-14_x

            cacert
          ];

        buildPhase = ''
          cd test-wasm
          export HOME=$TMP
          npm install
          npm run asbuild

          cd ..
          cargo test

          mkdir $out
        '';

        dontInstall = true;
        dontFixup = true;
      };

      devShell = pkgs.mkShell {
        buildInputs = with pkgs; [
          rust
          nodejs-14_x

          cargo-release
        ];
      };
    }
  );
}