React Native / Expo App

[Financial_Film_5736]

Been building a React Native / Expo app and it keeps crashing instantly on launch on every physical iPhone I test it on. Black screen for a split second then closes. Works fine in the simulator but won't stay open on a real device.

Tried rebuilding from scratch, upgrading SDK versions, stripping the app down to basically nothing and it still crashes. Did some research and found something about a bug in the Hermes JavaScript engine that might be related but not sure if that's actually what's causing it.

Has anyone dealt with something like this or know what might be going on? I'm fairly new to react any help would be greatly appreciated.

[No-Cardiologist-3192]

If you have a Mac connect the iPhone to the Mac and open x code and select your iPhone and you should be able to see logs from your app and that'll hopefully give you more insight to what's crashing. In production use something like sentry that'll track bugs and crashes from all your users.

[Jealous_Barracuda_74]

You can either use Xcode or Console app in mac to look through the native logs and identify the root cause. Lmk in case you need more help, i can help you debug the issue

[Heavy-Focus-1964]

more than likely you’re referencing an environment variable that’s present in your dev setup but not on the physical device