'react-native-exit-app installation problem - where is the " .a " file?

I think I'm a victim of bad documentation today. I installed a library called "react-native-exit-app" which requires native code tweaks to properly install. So there is this 3 lines for ios;

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I have pulled RNExitApp.xcoderproj and add to Libraries section in Xcode (eventhough docs have no mention of that).

But what is .a file and where is it? Thanks in advance



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