Maybe actually fix builds

nix/package.nix

@@ -5,48 +5,38 @@
   nodejs_22,
   pnpm_10,
   stdenv,
-  go,
+  hp_ssh_wasm,
   ...
 }:
 let
-  wasmExecJs =
-    if builtins.pathExists "${go}/share/go/lib/wasm/wasm_exec.js"
-    then "${go}/share/go/lib/wasm/wasm_exec.js"
-    else if builtins.pathExists "${go}/lib/wasm/wasm_exec.js"
-    then "${go}/lib/wasm/wasm_exec.js"
-    else "${go}/share/go/misc/wasm/wasm_exec.js";
+  pkg = builtins.fromJSON (builtins.readFile ../package.json);
+  pname = pkg.name;
+  version = pkg.version;
+  src = ../.;
 in
 stdenv.mkDerivation (finalAttrs: {
-  pname = "headplane";
-  version = (builtins.fromJSON (builtins.readFile ../package.json)).version;
-  src = ../.;
+  pname = pname;
+  version = version;
+  src = src;
 
   nativeBuildInputs = [
     makeWrapper
     nodejs_22
     pnpm_10.configHook
     git
-    go
   ];
 
   dontCheckForBrokenSymlinks = true;
 
   pnpmDeps = pnpm_10.fetchDeps {
-    inherit (finalAttrs) pname version src;
+    inherit pname version src;
     hash = "sha256-GNSpFqPobX6MDPUXxz2XwdZ2Wt7boN8aok52pGgpGoM=";
   };
 
   buildPhase = ''
     runHook preBuild
-
-    # Build the Go WASM binary
-    export GOOS=js
-    export GOARCH=wasm
-    go build -o app/hp_ssh.wasm ./cmd/hp_ssh
-
-    # Copy wasm_exec.js to the app directory (from Nix store)
-    cp ${wasmExecJs} app/wasm_exec.js
-
+    cp ${hp_ssh_wasm}/hp_ssh.wasm app/hp_ssh.wasm
+    cp ${hp_ssh_wasm}/wasm_exec.js app/wasm_exec.js
     pnpm build
     runHook postBuild
   '';
@@ -55,10 +45,11 @@ stdenv.mkDerivation (finalAttrs: {
     runHook preInstall
     mkdir -p $out/{bin,share/headplane}
     cp -r build $out/share/headplane/
+    cp -r node_modules $out/share/headplane/
     sed -i "s;$PWD;../..;" $out/share/headplane/build/server/index.js
     makeWrapper ${lib.getExe nodejs_22} $out/bin/headplane \
-        --chdir $out/share/headplane \
-        --add-flags $out/share/headplane/build/server/index.js
+      --chdir $out/share/headplane \
+      --add-flags $out/share/headplane/build/server/index.js
     runHook postInstall
   '';
 })

nix/wasm.nix

@@ -0,0 +1,35 @@
+{ buildGoModule, go, lib, ... }:
+
+let
+  pkg = builtins.fromJSON (builtins.readFile ../package.json);
+  pname = "hp_ssh-wasm";
+  version = pkg.version;
+  wasmExecJs =
+    if builtins.pathExists "${go}/share/go/lib/wasm/wasm_exec.js" then
+      "${go}/share/go/lib/wasm/wasm_exec.js"
+    else if builtins.pathExists "${go}/lib/wasm/wasm_exec.js" then
+      "${go}/lib/wasm/wasm_exec.js"
+    else
+      "${go}/share/go/misc/wasm/wasm_exec.js";
+in
+buildGoModule rec {
+  inherit pname version;
+  src = ../.;
+  subPackages = [ "cmd/hp_ssh" ];
+  vendorHash = "sha256-3hZzDORAH+D4FW6SkOv3Enddd+q36ZALryvCPD9E5Ac=";
+  env.CGO_ENABLED = 0;
+
+  nativeBuildInputs = [ go ];
+
+  buildPhase = ''
+    export GOOS=js
+    export GOARCH=wasm
+    go build -o hp_ssh.wasm ./cmd/hp_ssh
+  '';
+
+  installPhase = ''
+    mkdir -p $out
+    cp hp_ssh.wasm $out/
+    cp ${wasmExecJs} $out/wasm_exec.js
+  '';
+}