make the viewer build more intelligent to run npm only if files are changed
make the viewer build more intelligent to run npm only if files are changed

wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav,wellenvogel/avnav