I've inherited a react-native mobile app and am slowly making headway learning both react-native and the app itself.
I've run into an issue that I can't make headway on.
I can run the app perfectly fine in Xcode 12 on iOS simulators less than 13. However, on 13.5 or 14 I get the app splash screen and then the immediate error of Maximum call stack size exceeded. The screen shows the traced exception coming from loadModuleImplementation in require.js. I've put debug statements in require.js and I can see all the modules being loaded in iOS 12 versus iOS 13.5. There are hundreds of components being loaded, but substantially less are loaded before I get the error in 13.
I believe the app published in the app store works fine on 13 and 14... at least I've been told I have the code that has built the store version.
The app has over a dozen react-native components it uses.
react : 16.8.3
react-native : 0.59.9
react-native-device-info : 5.6.2
and on...
Using node 10, npm 5.6.0, Metro Bundler
It appears the previous developers stopped upgrading react-native at 0.59.9 because of the changes needed to go to 0.60.0. I've tried to upgrade but it appears to be a lot of work.
I'm looking for advice as to where to spend my time next to resolve this. Is this an issue with this version of react-native and iOS 13+?
Try to see what is being loaded in app.js. Comment everything out and gradually add everything back again and you might spot the error.