{
  # heavily inspired by Mr. Raf (aka @NotAShelf)
  description = "A Rexie flake template";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
    systems.url = "github:nix-systems/default";
  };

  outputs = {
    self,
    nixpkgs,
    systems,
    ...
  }: let
    pkgsOf = nixpkgs.legacyPackages;
    eachSystem = nixpkgs.lib.genAttrs (import systems);
  in {
    packages = eachSystem (system: {
      default = pkgsOf.${system}.callPackage ./nix/package.nix {}; # ALWAYS callPackage your package drvs
    });

    devShells = eachSystem (system: {
      default = pkgsOf.${system}.callPackage ./nix/shell.nix {
        your-package-name = self.packages.${system}.default;
      };
      ### nix/shell.nix
      ## {mkShell, your-package-name}:
      ## mkShell {
      ##  inputsFrom = [your-package-name];
      ##  packages = [
      ##    # other dev packages
      ##  ]
      ## }
    });
  };
}