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Dulmandakh b640b6faf7 nullable annotations to ReadableMap, WritableMap, ReadableArray, Writable. (#23329 )

Summary:
Kotlin is getting traction and more developers write RN native modules in it. This PR adds nullable annotations to help with Kotlin null inference and improve developer experience. Also it'll help checking code quality using lint.

I skimmed through JavaOnlyMap.java, JavaOnlyArray.java, ReadableNativeArray.java, ReadableNativeMap.java, WritableNativeArray.java and WritableNativeMap.java to infer nullability.

This is breaking change to Kotlin code.

[Android] [Changed] - Add nullable annotations to ReadableMap, WritableMap, ReadableArray, Writable.
Pull Request resolved: https://github.com/facebook/react-native/pull/23329

Differential Revision: D14002571

Pulled By: cpojer

fbshipit-source-id: 899d8b3b0a5dad43e8300e6c4ea4208cca0f01a9

2019-02-08 04:16:24 -08:00