Hey, I work on Yammer, and I'm one of the contributors to this project. YamUI is a cross-team effort between our Design and Frontend teams to create drop-in components for Yammer.com that have strictly-enforced style and behavior. As @gregod said, it is based on Office's awesome Fabric project: https://github.com/OfficeDev/office-ui-fabric-react/
The project is just us working in the open. We're not trying to push this as a new component framework for others to use, and we probably don't have the bandwidth to support external consumers, but we're happy if people can learn from it.
The project is just us working in the open. We're not trying to push this as a new component framework for others to use, and we probably don't have the bandwidth to support external consumers, but we're happy if people can learn from it.