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If you’re trying to get react-native working with XCode 10 and encountering a bunch of mysterious errors, here’s what you do. This is for just getting a brand new React-native app working using react-Native init. You might have to do lots of other fun things if you have an existing project. For folks with an existing app who upgraded to XC 10, you probably have other issues and this might serve as a good starting point.Fixing babel runtime just install @babel/runtime.