Can anyone recommend a visual UI development tool for ReactJS?

React seems incredibly well suited to visual application design.

The comparison that jumps to mind is the old Delphi IDE let you pull components onto your application and then customise the code.

The most painful and time consuming aspect of React development is pulling the UI together. That's not React's fault - there should be a really nice IDE that lets you fly around adding components and tying things together.

Does any have experience of such a thing? And I'm looking for something for the professional developer - not a toy that only gets a little bit of the way there before you give up and have to return to coding it all by hand.