Question: What is the custom native code that prevents from running on Expo Go?

[tsuz]

Why

I am trying to install this library so that it's compatible with Expo Go (to support expo build) but in the installation method, it says

This package cannot be used in the "Expo Go" app because it requires custom native code.`

Can someone point to which custom native code is required? I thought it was only pre_install/post_install (doc, file) but this doesn't seem to be required according to Mapbox docs. I believe I'm missing something else here.

FWIW, I've taken a look at a related PR here but no luck.

Thanks,

[BelyaninD]

You need to build your dev client using EAS Build.

https://docs.expo.dev/development/getting-started/

[tsuz]

@BelyaninD

Thanks for the answer.
My question was probably unclear - to rephrase it, "why do we need to build my dev client for Mapbox but not for Google Maps?"

[BelyaninD]

I think because Expo Go contains all Expo packages. Among them there is react-native-maps, which implements Google Maps using google services for android and iMap(?) on ios.

[wodin]

@tsuz, an Expo custom dev client is basically a custom version of Expo Go with your dependencies installed.
https://docs.expo.dev/development/introduction/

As @BelyaninD says, Expo Go includes all the native code needed by the Expo SDK. If you want to use any other dependencies that need native code that is not included in the Expo SDK, then you'll need to build a dev client and use that instead of Expo Go.

rnmapbox/maps includes native code that is not included in the Expo SDK, so if you want to use it, you'll need to build a dev client.

Can someone point to which custom native code is required?

It's all the code under android and ios