Summary:
Flow syntax is wrong, instead of using `Array` author used syntax for [tuples](https://flow.org/en/docs/types/tuples/). Tested with flow 0.49.1.
1. Import `removeDeliveredNotifications` in your code and pass an array with more than one element.
2. Test with flow.
Closes https://github.com/facebook/react-native/pull/15490
Differential Revision: D5622949
Pulled By: ericnakagawa
fbshipit-source-id: f9ed35a178eebac1b26a6ec15c66dc14331f7d34
68bbccbaa2