If you don't have Yarn, install it.
Before all else, after you've pulled, run yarn clean,
To run on iOS Simulator, run: yarn ios
To run on Android, run: yarn android then if needed, adb reverse tcp:8081 tcp:8081
To just start the packager, run: yarn start
If you get a weird resolve error, something with ./node_modules/react-native/src/api/auth, then try running yarn start --reset-cache
To run on your iOS device, connect it to the Mac, open Xcode
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