Matt Sessions a8391bde7d SectionList renderItem should be optional
Summary:
`renderItem` on `SectionList` is within the `OptionalProps` group of props but it is not actually marked as optional. Which means that doing things such as in the example where each section has its own `renderItem` and no `renderItem` prop is passed into `SectionList` will fail flow.

Create a `SectionList` where each section has it's own `renderItem` and do not pass in a `renderItem` into `SectionList`. Run flow, it should error.

[GENERAL] [MINOR] [SectionList] -Makes `renderItem` prop on `SectionList` optional for flow.
Closes https://github.com/facebook/react-native/pull/17262

Differential Revision: D6645672

Pulled By: hramos

fbshipit-source-id: 1096e8c4998c14003cf42f29ea559505082047c1
2017-12-29 14:26:08 -08:00
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