chore: flake.nix setup

flake.nix

@@ -0,0 +1,33 @@
+{
+  description = "My development environment";
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+  outputs = {
+    self,
+    nixpkgs,
+  }: let
+    systems = [
+      "x86_64-linux"
+      "aarch64-linux"
+      "x86_64-darwin"
+      "aarch64-darwin"
+    ];
+    forAllSystems = f:
+      nixpkgs.lib.genAttrs systems (system: let
+        pkgs = import nixpkgs {inherit system;};
+      in
+        f system pkgs);
+  in {
+    devShells = forAllSystems (system: pkgs: {
+      default = pkgs.mkShell {
+        buildInputs = with pkgs; [
+          eslint
+          nodejs_22
+          nodePackages_latest.prettier
+          bun
+        ];
+      };
+    });
+  };
+}