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{
  inputs = {
    flake-utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
    ocaml.url = "github:nix-ocaml/nix-overlays";
    ocaml.inputs.nixpkgs.follows = "nixpkgs";
    # it's broken wtf
    # lsp.url = "github:ocaml/ocaml-lsp";
    # lsp.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = {
    self,
    nixpkgs,
    ocaml,
    flake-utils,
  }:
    flake-utils.lib.eachDefaultSystem (system: let
      pkgs = import nixpkgs {
        inherit system;
        overlays = [
          ocaml.overlays.default
          (final: prev: {
            # This ensures we consistently use one version of ocaml packages
            ocamlPackages = prev.ocaml-ng.ocamlPackages_5_3;
            ocaml = prev.ocaml-ng.ocamlPackages_5_3.ocaml;
          })
        ];
      };

      quickjs = pkgs.ocamlPackages.buildDunePackage {
        name = "quickjs";
        pname = "quickjs";
        version = "0.1.2";
        src = pkgs.fetchFromGitHub {
          fetchSubmodules = true;
          owner = "ml-in-barcelona";
          repo = "quickjs.ml";
          rev = "5c4aa494acdf0f7b83a7b135b4ecd5d086cc1c64";
          sha256 = "2rHyfc4Ru5fjuQY5xueJRSXBcVofVvPDagN0sFL7/nY=";
        };
        buildInputs = [pkgs.git];
        propagatedBuildInputs = [
          pkgs.git
          pkgs.ocamlPackages.alcotest
          pkgs.ocamlPackages.integers
          pkgs.ocamlPackages.ctypes
        ];
      };
      server-reason-react = pkgs.ocamlPackages.buildDunePackage {
        pname = "server-reason-react";
        version = "0.4.0";
        src = pkgs.fetchFromGitHub {
          owner = "polwex";
          repo = "server-reason-react";
          rev = "d5dd436b0a447ff0a82f9a8d7a02f102139299a9";
          sha256 = "PsrOqZgdFIy5tGoLpS+hf9uz42vKJZbSvdWRW8MX604=";
        };

        propagatedBuildInputs = with pkgs.ocamlPackages; [
          melange
          ppxlib
          ocaml_pcre
          lwt
          lwt_ppx
          uri
          quickjs
          #
          yojson
          uucp
        ];
        nativeBuildInputs = with pkgs.ocamlPackages; [
          reason
          melange
          # reason-native.refmett
        ];
      };
      # lib = pkgs.lib if unavailable
      gemini-cli = pkgs.callPackage ./gemini.nix {
        inherit
          (pkgs)
          buildNpmPackage
          fetchFromGitHub
          fetchNpmDeps
          cacert
          curl
          gnused
          jq
          nix-prefetch-github
          prefetch-npm-deps
          writeShellApplication
          ;
      };
      mlx-repo = pkgs.fetchFromGitHub {
        owner = "ocaml-mlx";
        repo = "mlx";
        rev = "aa59db58c948f93ab960c63e127f0f5c41d8530c";
        sha256 = "g2v6U4lubYIVKUkU0j+OwtPxK9tKvleuX+vA4ljJ1bA=";
      };
      mlx = pkgs.ocamlPackages.buildDunePackage {
        pname = "mlx";
        version = "0.9.0";
        src = mlx-repo;
        propagatedBuildInputs = with pkgs.ocamlPackages; [
          ppxlib
          ocaml-compiler-libs
        ];
      };
      ocamlmerlinmlx = pkgs.ocamlPackages.buildDunePackage {
        pname = "ocamlmerlin-mlx";
        version = "0.9.0";
        src = mlx-repo;

        nativeBuildInputs = with pkgs.ocamlPackages; [
          cppo
        ];
        propagatedBuildInputs = with pkgs.ocamlPackages; [
          ppxlib
          merlin-lib
          csexp
        ];
      };
      # lsp-repo = pkgs.fetchFromGitHub {
      #   owner = "ocaml";
      #   repo = "ocaml-lsp";
      #   rev = "4483b5b9cb3c58d09cfd113394f3ced8fea11f50";
      #   sha256 = "+h8XzJutCT587XrLg/rC/c7TXsnm84BEtvUj4CfFqaM=";
      # };
      # jsonrpc = pkgs.ocamlPackages.buildDunePackage {
      #   pname = "jsonrpc";
      #   version = "1.23.0";
      #   src = lsp-repo;
      # };
      # lsp = pkgs.ocamlPackages.buildDunePackage {
      #   pname = "lsp";
      #   version = "1.23.0";
      #   src = lsp-repo;
      #   propagatedBuildInputs = with pkgs.ocamlPackages; [
      #     yojson
      #     uutf
      #     ppx_yojson_conv
      #     jsonrpc
      #   ];
      # };
      # ocaml-lsp = pkgs.ocamlPackages.buildDunePackage {
      #   pname = "ocaml-lsp-server";
      #   version = "1.23.0";
      #   src = lsp-repo;
      #   nativeBuildInputs = with pkgs.ocamlPackages; [merlin-lib];
      #   propagatedBuildInputs = with pkgs.ocamlPackages; [
      #     lsp
      #     jsonrpc
      #     stdune
      #     dune-build-info
      #     ocamlc-loc
      #     ocamlformat-rpc-lib
      #     dune-rpc
      #     re
      #     merlin-lib
      #     spawn
      #     chrome-trace
      #     fiber
      #     camlp-streams
      #     astring
      #   ];
      # };
    in {
      devShells.default = pkgs.mkShell rec {
        packages = [gemini-cli];
        buildInputs =
          nativeBuildInputs
          ++ (with pkgs.ocamlPackages; [utop]);
        nativeBuildInputs = with pkgs.ocamlPackages; [
          pkgs.openjdk17
          pkgs.nodejs
          pkgs.tailwindcss_4
          pkgs.sqlite
          pkgs.dune_3
          pkgs.ocaml

          pkgs.opam
          findlib
          ocamlformat
          #
          ocaml-lsp
          mlx
          ocamlmerlinmlx
          #
          ocamlformat-mlx
          melange-json-native
          ppx_rapper
          ppx_rapper_eio
          yojson
          eio_main
          piaf
          routes
          # caqti-dynload
          # caqti-driver-postgresql
          caqti-driver-sqlite3
          ppx_expect
          logs
          #
          reason
          server-reason-react
        ];
      };
    });
}