RFR: 8293067: (fs) Implement WatchService using system library (macOS)

[Michael Hall]

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> 
> @AlanBateman Thank you for the log. I see all the right calls, but I don't see any events coming in from the OS.
> 
> I'm afraid this is the line beyond which I can't tread; there seem to be instances where [certain directories don't generate FSEvents](https://github.com/livereload/livereload-site/blob/master/livereload.com/_articles/troubleshooting/os-x-fsevents-bug-may-prevent-monitoring-of-certain-folders.md <https://github.com/livereload/livereload-site/blob/master/livereload.com/_articles/troubleshooting/os-x-fsevents-bug-may-prevent-monitoring-of-certain-folders.md>), there's even a [tool](https://github.com/andreyvit/find-fsevents-bugs <https://github.com/andreyvit/find-fsevents-bugs>) to find those. Unfortunately, I know nothing beyond what was said on those pages.
> 

If as these suggest this is an Apple FSEvents bug it might be worth filing your own bug report? I’m don’t remember what Apple does with duplicates but they may not close yours and you could get updates.

For me this still continues to run flawlessly. I haven’t been able to break it trying. So the property might still make sense for some users?


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