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{
  description = "getchoo's nix expressions";

  nixConfig = {
    extra-substituters = [ "https://getchoo.cachix.org" ];
    extra-trusted-public-keys = [ "getchoo.cachix.org-1:ftdbAUJVNaFonM0obRGgR5+nUmdLMM+AOvDOSx0z5tE=" ];
  };

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    # this can be removed with `inputs.flake-checks.follows = ""`
    flake-checks.url = "github:getchoo/flake-checks";
  };

  outputs =
    { nixpkgs, flake-checks, ... }:
    let
      systems = [
        "x86_64-linux"
        "aarch64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
      ];

      forAllSystems = fn: nixpkgs.lib.genAttrs systems (sys: fn nixpkgs.legacyPackages.${sys});
    in
    {
      checks = forAllSystems (
        pkgs:
        let
          flake-checks' = flake-checks.lib.mkChecks {
            root = ./.;
            inherit pkgs;
          };
        in
        {
          inherit (flake-checks') actionlint deadnix statix;
        }
      );

      packages = forAllSystems (
        {
          lib,
          pkgs,
          system,
          ...
        }:
        let
          /*
            this filters out packages that may be broken or not supported
            on the current system. packages that have no `broken` or `platforms`
            meta attribute are assumed to be valid
          */
          isValid =
            _: v: lib.elem pkgs.system (v.meta.platforms or [ pkgs.system ]) && !(v.meta.broken or false);

          pkgs' = lib.filterAttrs isValid (import ./. { inherit pkgs; });
        in
        pkgs' // { default = pkgs'.treefetch; }
      );

      formatter = forAllSystems (pkgs: pkgs.nixfmt-rfc-style);

      templates = import ./templates;
    };
}