This is the source of the Docker image bayesimpact/react-base.
It is used to speed up setup when developping a project using React with npm. It prepares a container with node and npm latest versions as well as a good deal of node modules pre-installed.
Use it as a base and put your actual application in /usr/app.
If you use this image for production (but you should compile your React anyway), beware that there might be many node modules that you won't need at all.