Added setup hook that adds a Node package automatically to NODE_PATH, if included in the buildInputs parameter

pkgs/development/web/nodejs/default.nix

@@ -31,6 +31,8 @@ stdenv.mkDerivation rec {
   '';
 
   buildInputs = [ python openssl v8 zlib ] ++ stdenv.lib.optional stdenv.isLinux utillinux;
+  
+  setupHook = ./setup-hook.sh;
 
   meta = with stdenv.lib; {
     description = "Event-driven I/O framework for the V8 JavaScript engine";

pkgs/development/web/nodejs/setup-hook.sh

@@ -0,0 +1,5 @@
+addNodePath () {
+    addToSearchPath NODE_PATH $1/node_modules
+}
+
+envHooks=(${envHooks[@]} addNodePath)