If you are reporting an error please include a test case that demonstrates the issue you're reporting! This is very helpful to maintainers in order to help us see the issue you're seeing.
Here is a Plunker you can fork that has react-select loaded and supports JSX syntax: https://plnkr.co/edit/HTmtER9AMNcPoWhXV707?p=preview
You may also find the online Babel tool quite helpful if you wish to use ES6/ES7 syntax not yet supported by the browser you are using.