We have a new post up on the Cesium blog by community member and guest author Hiroki Inoue about the library he developed to integrate Cesium with React:
https://cesium.com/blog/2018/03/05/integrating-cesium-and-react/
You may also want to check our community member Mark Erikson’s post on integrating React and Cesium:
http://blog.isquaredsoftware.com/2017/03/declarative-earth-part-2-cesium-react/