{
  description = "A simple modpack.";
  inputs.minecraft.url = "github:Ninlives/minecraft.nix";
  inputs.flake-utils.url = "github:numtide/flake-utils";

  outputs = { self, minecraft, flake-utils }:
    flake-utils.lib.eachDefaultSystem (system: {
      packages.minecraft-with-ae2 = (minecraft.legacyPackages.${system}.v1_18_1.fabric.client.withMods [
        (builtins.fetchurl {
          # file name must have a ".jar" suffix to be loaded by fabric
          name = "fabric-api.jar";
          url =
            "https://media.forgecdn.net/files/3609/610/fabric-api-0.46.1%2B1.18.jar";
          sha256 =
            "sha256:0d6dw9lsryy51by9iypcg2mk1p1ixf0bd3dblfgmv6nx8g98whlh";
        })
        # the withMods function is also composable
      ]).withMods [
        (builtins.fetchurl {
          url =
            "https://media.forgecdn.net/files/3609/46/appliedenergistics2-10.0.0.jar";
          sha256 =
            "sha256:0v7nw98b22lbwyd5qy71w93rj7sh7ps30g4cb38s3g3n997yk49n";
        })
      ];
    });
}