Steve Gravrock 79c6bbc189 clearStack optimizations ...

* Avoid setTimeout in Node, because we don't need the overhead there.
* Still call setTimeout in browsers to prevent the tab from being killed.
* Use queueMicrotask in Safari, because it's dramatically faster than
  MessageChannel there.
* Continue to use MessageChannel in other supported browsers becuase it's
  somewhat faster than queueMicrotask there.
* Don't use setImmediate any more because there's a faster alternative in
  all supported envs.

In jasmine-core's own test suite, this yields a roughly 50-70% speedup
in Node, ~20% in Edge, and 75-90%(!) in Safari.

2022-08-15 17:50:49 -07:00

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