feat: flake

flake.nix

@@ -1,31 +1,97 @@
 {
+  description = "JavaScript example flake for Zero to Nix";
+
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
-    systems.url = "github:nix-systems/default";
-    
     flake-compat.url = "https://flakehub.com/f/edolstra/flake-compat/1.tar.gz";
   };
 
-  outputs = {
-    systems,
-    nixpkgs,
-    ...
-  } @ inputs: let
-    eachSystem = f:
-      nixpkgs.lib.genAttrs (import systems) (
-        system:
-          f nixpkgs.legacyPackages.${system}
-      );
-  in {
-    devShells = eachSystem (pkgs: {
-      default = pkgs.mkShell {
-        buildInputs = [
-          pkgs.bun
-          pkgs.nodePackages.typescript
-          pkgs.nodePackages.typescript-language-server
-        ];
-      };
-    });
-  };
-}
+  outputs = { self, nixpkgs, flake-compat }:
+    let
+      # Systems supported
+      allSystems = [
+        "x86_64-linux" # 64-bit Intel/AMD Linux
+        "aarch64-linux" # 64-bit ARM Linux
+        "x86_64-darwin" # 64-bit Intel macOS
+        "aarch64-darwin" # 64-bit ARM macOS
+      ];
 
+      # Helper to provide system-specific attributes
+      forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
+        pkgs = import nixpkgs { inherit system; };
+      });
+    in
+    {
+      packages = forAllSystems ({ pkgs }: {
+        default = let 
+          pin = pkgs.lib.importJSON ./pin.json;
+          src = self;
+          node_modules = pkgs.stdenv.mkDerivation {
+            pname = "versiajs-node_modules";
+            inherit src;
+            version = pin.version;
+            impureEnvVars = pkgs.lib.fetchers.proxyImpureEnvVars
+              ++ [ "GIT_PROXY_COMMAND" "SOCKS_SERVER" ];
+            nativeBuildInputs = with pkgs; [ bun nodejs nodePackages.typescript nodePackages.typescript-language-server ];
+            buildInputs = with pkgs; [ libstdcxx5 ];
+            dontConfigure = true;
+            buildPhase = ''
+              bun install --production --frozen-lockfile --ignore-scripts
+            '';
+            installPhase = ''
+              mkdir -p $out/node_modules
+              cp -R ./node_modules $out
+            '';
+            outputHash = pin."${pkgs.stdenv.system}";
+            outputHashAlgo = "sha256";
+            outputHashMode = "recursive";
+            dontFixup = true;
+          };
+        in pkgs.stdenv.mkDerivation {
+          name = "versiajs";
+          version = pin.version;
+
+          buildPhase = ''
+            runHook preBuild
+
+            ln -s ${node_modules}/node_modules .
+            bun run build
+
+            runHook postBuild
+          '';
+
+          installPhase = ''
+            runHook preInstall
+            mkdir -p $out/bin
+            cp -R ./* $out
+            makeBinaryWrapper ${pkgs.bun}/bin/bun $out/bin/versiajs \
+              --prefix PATH : ${pkgs.lib.makeBinPath [ pkgs.bun ]} \
+              --add-flags "run --prefer-offline --no-install --cwd $out ./cli/index.ts start"
+
+            runHook postInstall
+          '';
+          
+          buildInputs = with pkgs; [
+            nodejs
+          ];
+
+          nativeBuildInputs = with pkgs; [ makeBinaryWrapper bun ];
+
+          inherit src;
+
+          dontConfigure = true;
+        };
+      });
+      devShells = forAllSystems ({ pkgs }: {
+        default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            bun
+            nodejs
+            nodePackages.typescript
+            nodePackages.typescript-language-server
+            nix-ld
+          ];
+        };
+      });
+    };
+}