[Fresh] Fall back to Map/Set if Weak equivalents are not available (#15907)
* Fall back to Map/Set if Weak equivalents are not available * Fix Prettier vs Flow fighting
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Dan Abramov committed
cd98e63b47198147cfd140cd4454a6db68e08a9f
Parent: a3c5b1f
Committed by GitHub <noreply@github.com>
on 6/17/2019, 3:00:29 PM