added nix.

Author: diasbruno

flake.lock

@@ -0,0 +1,26 @@
+{
+  description = "react-modal flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-25.05";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        inputs = with pkgs; [pkg-config nodejs_22 openssl];
+      in {
+        devShell = pkgs.mkShell {
+          name = "react-modal";
+          buildInputs = inputs;
+          shellHook = ''
+ export EDITOR=emacs;
+ export NODE_OPTIONS=--openssl-legacy-provider;
+ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${pkgs.lib.makeLibraryPath[
+   pkgs.openssl
+ ]};
+ '';
+        };
+      });
+}