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Does Fiber yield control back to the js engine when doing the "rebasing"? Or are all of these synchronous in one frame?

Yea, it does. We are using requestIdleCallback to do the work "while we can", and then yield the control back. Again, this won't be a part of React 16, but it's part of the bigger picture we are moving towards.

Relevant code if you're curious: https://github.com/facebook/react/blob/233195cb6bc632ade61a8...

Interesting...

Since requestIdleCallback leaves the scheduling out of your hand, how do you ensure nodes are still updated when you need it? Like tests?

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