The goal of this build pack is to build a simple and understandable buildpack. It serves as an example for the guide: http://www.suse.com/media/guide/how_to_build_your_own_custom_buildpacks_guide.pdf
It installs node.js and wraps the given app in a HTTP server to give an easy FaaS-like experience.
For some thoughts about why you might care: https://www.suse.com/c/why-you-might-want-to-build-your-own-custom-buildpack-and-how-to/