Firebase for react and react native

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I'm planning to write a cross platform app using react native using Firebase for backend. I did some research and found the library called React-Native-Firebase. But this library seems to use native part of firebase(android and ios), and my concern is:

If I use React-Native-Firebase to do backend jobs, will I need to write those logics AGAIN using normal Firebase(web version) for building web app with react?

I thought this way because using firebase seems basically like calling Firebase API's in react native or react code.

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