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Upgrade jest to 23.4.1
Summary: This includes facebook/jest@8b8f5bc, which improves the watchman query to calculate the initial haste map to be much faster under Eden. **Time to initialize Metro after resetting jest-haste-map cache (Eden checkout)** * Before this diff: 3m14 (sometimes taking up to 15min!! after rebasing) * With this diff: 12s (quite constant after rebasing) (16X improvement) **Time to initialize Metro with a warm jest-haste-map cache (Eden checkout)** * Before this diff: 1.1s * With this diff: 1.1s (I haven't seen meaningful perf changes in non-eden checkouts) Reviewed By: mjesun Differential Revision: D8857820 fbshipit-source-id: 5ce9da04a69bd02d121a8efe65bf369c7fa1e834
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