angular 2 ng-build every time when code changed?

I developping a mean-APP. In the past I only used angular and ng-serve was a bless to try code out and develop.

Now in combination with nodejs as a server, who loads angular in my so called "public" folder, I have to do "ng build" every time and it does go trough all files, even if I just changed a little code on one component typescript.

My question? What can I do to develop faster using nodejs and angular 2 without hitting everytime "ng build" on changed code?

Thanks in advance and have a great day.

via user3332010