Add nix.flake for easy devshell.

.envrc

@@ -0,0 +1 @@
+use flake

.gitignore

@@ -186,4 +186,6 @@ Sessionx.vim
 *~
 .*.swp
 # Auto-generated tag files
-tags
+tags
+# nix flake stuff
+.direnv

flake.nix

@@ -0,0 +1,133 @@
+{
+  # hiwell
+  description = "neoburgh";
+
+  inputs = {
+    nixpkgs = {
+      url = "github:nix-ocaml/nix-overlays";
+      inputs.flake-utils.follows = "flake-utils";
+    };
+
+    ocaml-overlay = {
+      url = "github:nix-ocaml/nix-overlays";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    flake-utils = {
+      url = "github:numtide/flake-utils";
+    };
+
+    quickjs = {
+      type = "git";
+      url = "https://github.com/ml-in-barcelona/quickjs.ml.git";
+      submodules = true;
+      flake = false;
+    };
+
+    server-reason-react = {
+      url = "github:ml-in-barcelona/server-reason-react";
+      flake = false;
+    };
+  };
+
+  outputs =
+    inputs@{
+      self,
+      nixpkgs,
+      flake-utils,
+      ...
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        version = "0.59.2+dev";
+        pkgs = nixpkgs.legacyPackages."${system}".extend (
+          self: super: {
+            ocaml = super.ocaml-ng.ocamlPackages_5_1;
+            ocamlPackages = super.ocaml-ng.ocamlPackages_5_1;
+            # .overrideScope (
+            #   oself: osuper: { ppxlib = osuper.ppxlib.override ({ version = "0.32.1"; }); }
+            # );
+          }
+        );
+        inherit (pkgs) ocamlPackages mkShell;
+        inherit (ocamlPackages) buildDunePackage;
+
+        quickjs = buildDunePackage {
+          pname = "quickjs";
+          version = "";
+          propagatedBuildInputs = with ocamlPackages; [
+            dune_3
+            ocaml
+            integers
+            ctypes
+          ];
+          src = inputs.quickjs;
+        };
+
+        server-reason-react = buildDunePackage {
+          pname = "server-reason-react";
+          version = "";
+          nativeBuildInputs = with ocamlPackages; [
+            reason
+            melange
+          ];
+          propagatedBuildInputs = with ocamlPackages; [
+            dune_3
+            ocaml
+            ppxlib
+            melange
+            quickjs
+            lwt
+            lwt_ppx
+            integers
+            uri
+          ];
+          src = inputs.server-reason-react;
+        };
+      in
+      {
+        devShells = {
+          default = mkShell.override { stdenv = pkgs.clang18Stdenv; } {
+            buildInputs = with ocamlPackages; [
+              dune_3
+              ocaml
+              utop
+              ocamlformat
+            ];
+            inputsFrom = [ self.packages."${system}".default ];
+            packages = builtins.attrValues {
+              inherit (pkgs) clang_18 clang-tools_18 pkg-config;
+              inherit (ocamlPackages) ocaml-lsp ocamlformat-rpc-lib;
+            };
+          };
+        };
+        packages = {
+          default = buildDunePackage {
+            inherit version;
+            pname = "styled-ppx";
+            nativeBuildInputs = with ocamlPackages; [ ];
+            propagatedBuildInputs = with ocamlPackages; [
+              alcotest
+              dune_3
+              fmt
+              melange
+              menhir
+              ocaml
+              ppx_deriving
+              ppx_deriving_yojson
+              ppxlib
+              reason
+              reason-react
+              reason-react-ppx
+              sedlex
+              server-reason-react
+              yojson
+            ];
+            src = ./.;
+          };
+        };
+        formatter = pkgs.alejandra;
+      }
+    );
+}