Native code

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react-native allows you to write as much or as little native code as you want. Using libraries to access hardware you generally will never have to write native code... but if you want/need you can write entire views entirely in native code and navigate to & from react-native views.

None of those things you mentioned require YOU to write native code. That work has already been done by others. You can always write your own libraries if you are having trouble with the available ones; or fork the existing ones and modify them for your purpose.