In development mode, Google Closure Library loads scripts dynamically
using the goog.require and goog.provide directives. However, if some
of the files use JSX syntax, they must be transformed before being loaded.
This library should be loaded before the Google Closure Library and after the React JSXTransformer. It overrides the default Closure script loading to perform JSX transformation on the fly.
It is a development tool. Do not use it in production!
