Simplify and improve flake.nix

flake.lock

@@ -2,15 +2,16 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1684787197,
-        "narHash": "sha256-tvGDj3zgpW5NGoVKvoTQvkhfFPDgkbzfX+zFUW8NeHw=",
+        "lastModified": 1695318763,
+        "narHash": "sha256-FHVPDRP2AfvsxAdc+AsgFJevMz5VBmnZglFUMlxBkcY=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "e2614d8ebcdf9a9eae0efe074f4d745d28595886",
+        "rev": "e12483116b3b51a185a33a272bf351e357ba9a99",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -1,27 +1,17 @@
 {
-  description = "JavaScript development environment";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
 
-  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs";
-  };
-
-  outputs = { self, nixpkgs }:
-    let
-      # Systems supported
-      allSystems = [
-        "x86_64-linux"
-        "aarch64-linux"
-        "x86_64-darwin"
-        "aarch64-darwin"
-      ];
-      
-      forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
+  outputs = { self, nixpkgs }: let
+    system = "x86_64-linux";
     pkgs = nixpkgs.legacyPackages.${system};
-      });
-    in
-    {
-      packages = forAllSystems ({ pkgs }: {
-        default = pkgs.buildNpmPackage {
+  in {
+    devShells.${system}.default = pkgs.mkShell {
+      packages = with pkgs; [
+        nodejs_20
+        tree
+      ];
+    };
+    packages.${system}.default = pkgs.buildNpmPackage {
       name = "build-aurora-blog";
       buildInputs = with pkgs; [
         nodejs_20
@@ -34,6 +24,5 @@
         cp -r dist/* $out
       '';
     };
-      });
   };
 }