chore: added nix config

flake.nix

@@ -0,0 +1,15 @@
+{
+  description = "React Utils";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs = { nixpkgs, ... }: let
+    forAllSystems = nixpkgs.lib.genAttrs nixpkgs.lib.systems.flakeExposed;
+  in {
+    # Devshell for bootstrapping; acessible via 'nix develop' or 'nix-shell' (legacy)
+    devShells = forAllSystems (systems:
+      let pkgs = nixpkgs.legacyPackages.${systems};
+      in import ./shell.nix { inherit pkgs; }
+    );
+  };
+}

nixpkgs.nix

@@ -0,0 +1,8 @@
+# A nixpkgs instance that is grabbed from the pinned nixpkgs commit in the lock file
+# Useful to avoid using channels when using legacy nix commands
+let lock = (builtins.fromJSON (builtins.readFile ./flake.lock)).nodes.nixpkgs.locked;
+in
+import (fetchTarball {
+  url = "https://github.com/nixos/nixpkgs/archive/${lock.rev}.tar.gz";
+  sha256 = lock.narHash;
+})

shell.nix

@@ -1,9 +1,16 @@
-{ pkgs ? import <nixpkgs-unstable> { } }:
+# Shell for bootstrapping flake-enabled nix and home-manager
+# Enter it through 'nix develop' or (legacy) 'nix-shell'
 
-pkgs.mkShell {
-  buildInputs = with pkgs; [
-    gnumake
-    nodejs_20
-    bun
-  ];
+{ pkgs ? (import ./nixpkgs.nix) { } }: {
+  default = pkgs.mkShell {
+    # Enable experimental features without having to specify the argument
+    NIX_CONFIG = "experimental-features = nix-command flakes";
+    buildInputs = with pkgs; [
+      gnumake
+      nixpkgs-fmt
+      nixd
+      bun
+      nodejs_20
+    ];
+  };
 }