Commits on Mar 8, 2023

1. Internal test helpers: Use Node's MessageChannel to queue task …

   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.

   

   acdlite committed Mar 8, 2023
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