[lightblade]

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

[danabramov]

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...

[lightblade]

Interesting...

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