Summary:
I am sending an asynchronous function as callback to the `.start` method of `Animation.parallel([...]).start(callback)`. Flow does not like this, as the `EndCallback` type is saying that these callbacks must return `void`. Since my callback returns `Promise<void>` this results in an error.
Does it really matter what the callback returns?
## Changelog
[General] [Changed] - Make Animation EndCallback type allow any return value
Pull Request resolved: https://github.com/facebook/react-native/pull/25793
Test Plan: I have run `yarn flow`, which reported no errors.
Reviewed By: cpojer
Differential Revision: D16515465
Pulled By: osdnk
fbshipit-source-id: 420d29d262b65471e6e1ad4b5a126bf728336260
Mats ByrkjelandandFacebook Github Bot
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