perf: consolidate paths to parent path when threshold exceeded for fsevents watcher#60
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Now that I implemented some improvements (rolldown/notify#59, rolldown/notify#60), it doesn't error on large projects. kqueue doesn't have a way to watch recursively, so it's faster to use fsevent which supports recursive watches.
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If more than 10 paths are watched, watch the parent path instead.
This behavior was inspired by chokidar:
https://github.com/paulmillr/chokidar/blob/7c50e25d10a497ce4409f6e52eb630f0d7647b97/lib/fsevents-handler.js#L113-L119