flake.nix

{
  description = "HTTP web server for SPA";

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

  outputs = {
    self,
    nixpkgs,
    flake-utils,
    ...
  }:
    flake-utils.lib.eachSystem ["x86_64-linux"] (
      system: let
        nixpkgs' = nixpkgs.legacyPackages.${system};
        pkgs = import self {
          inherit system;
          inputs = null;
          nixpkgs = nixpkgs';
        };
      in {
        defaultPackage = pkgs.default;
        packages = pkgs;
        devShells.default = pkgs.devShell;
        checks = {
          fmt = with nixpkgs';
            runCommandLocal "fmt" {} ''
              export HOME=$(mktemp -d)
              cd ${./.}
              ${treefmt}/bin/treefmt --fail-on-change > $out
            '';
        };
      }
    );
}