{
  inputs = {
    # nixos-unstable provides a binary cache for all packages.
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    # flake-parts lets us define flake modules.
    flake-parts = {
      url = "github:hercules-ci/flake-parts";
      inputs.nixpkgs-lib.follows = "nixpkgs";
    };
    # import-tree imports all nix files in a given directory.
    import-tree.url = "github:vic/import-tree";
    # files lets us write text files and automatically add checks for them
    files.url = "github:mightyiam/files";
    # make-shells.<name> creates devShells and checks
    make-shell = {
      url = "github:nicknovitski/make-shell";
      inputs.flake-compat.follows = "dedupe_flake-compat";
    };

    # The following are not used but are here for deduplication.
    dedupe_flake-compat.url = "github:edolstra/flake-compat";
  };

  outputs = inputs: inputs.flake-parts.lib.mkFlake { inherit inputs; } (inputs.import-tree ./modules);
}