How can I use react-native link or How can I link a third party library manually in IOS and Android using exponent.
I was trying to link react-native-image-crop-picker but unable to use in exponent.
You can't. It states this very clearly in the docs:
But no native modules…
The most limiting thing about Expo is that you can’t add in your own native modules without detaching and using ExpoKit. Continue reading the next question for a full explanation.
If you want to use anything that requires react-native link, then you need to detach your project and then develop it with or without ExpoKit. You will lose certain features and integrations (off the top of my head, I think Push Notifications via Expo is one of them) when doing so, but that is the trade-off Expo provides as an all-in-one package. When detaching, you lose those features.
来源：https://stackoverflow.com/questions/44977693/react-native-link-using-expo