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To wait for the microtask queue to empty, our internal test helpers schedule an arbitrary task using `setImmediate`. It doesn't matter what kind of task it is, only that it's a separate task from the current one, because by the time it fires, the microtasks for the current event will have already been processed. The issue with `setImmediate` is that Jest mocks it. Which can lead to weird behavior. I've changed it to instead use a message event, via the MessageChannel implementation exposed by the `node:worker_threads` module. We should consider doing this in the public implementation of `act`, too.
scheduler
This is a package for cooperative scheduling in a browser environment. It is currently used internally by React, but we plan to make it more generic.
The public API for this package is not yet finalized.
Thanks
The React team thanks Anton Podviaznikov for donating the scheduler package name.