BarcodeScanner crashes standalone but not on dev

Expo SDK
#1

SDK Version: 43
Platforms: ios/android

Hi. I’ve upgrade to expo 43 (from 41) and the barcode scanner (via expo-camera) simply does not scan any QR code (works fine expo client, works fine in —no-dev —minify), can’t test simulator as there is no camera …

But when I build (via EAS), it simply does not scan anything on iOS, whereas on Android, the moment it scans, it instantly crashes.

How do I debug this … ?

#2

Does anyone have any clue how I can debug this?

  • scanner works fine in dev (expo go, as well as in production mode, --no-dev --minify)
  • scanner does not scan anything on iOS (in standalone build, at least it does not crash)
  • camera viewport is showing on Android, but when camera is initiated, it crashes.
#3

I’ve managed to pull the error from Android Vitals (play console).
So, on Android, this is the error: TypeError: undefined is not an object (evaluating ‘P.default.BarCodeType’)

  • the same code works fine on Expo 41 (from where I’ve upgraded)
  • it also works fine via expo build:android

Just when building with EAS, it simply crashes, while on iOS, it does not crash, but it doesn’t scan anything either.

com.facebook.react.common.JavascriptException: TypeError: undefined is not an object (evaluating 'P.default.BarCodeType'), stack:
<unknown>@1009:1912
h@2:1585
<unknown>@1008:6484
h@2:1585
<unknown>@530:7963
h@2:1585
<unknown>@462:199
h@2:1585
<unknown>@6:60
h@2:1585
d@2:958
global code@1120:3
at com.facebook.react.modules.core.ExceptionsManagerModule.reportException(ExceptionsManagerModule.java
  at java.lang.reflect.Method.invoke (Native Method)
  at com.facebook.react.bridge.JavaMethodWrapper.invoke (JavaMethodWrapper.java:372)
  at com.facebook.react.bridge.JavaModuleWrapper.invoke (JavaModuleWrapper.java:151)
  at com.facebook.react.bridge.queue.NativeRunnable.run (Native Method)
  at android.os.Handler.handleCallback (Handler.java:938)
  at android.os.Handler.dispatchMessage (Handler.java:99)
  at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage (MessageQueueThreadHandler.java:27)
  at android.os.Looper.loop (Looper.java:246)
  at com.facebook.react.bridge.queue.MessageQueueThreadImpl$4.run (MessageQueueThreadImpl.java:226)
  at java.lang.Thread.run (Thread.java:923)
#4

I’ve figured it out. Solution is to include expo-barcode-scanner in your package.json.

I think we should do one of the following:

  1. Have EAS account for this automatically, since BarcodeScanner is a dependency
  2. Add a note to the API Reference so that others know they need to install it if they want barcode scan support if the above is not possible