React Native - Android app working on Debug, crashing on Release

Question

I'm using React Native v0.19, and when running on Android my app works just fine on Debug, but immediately crashes when I run it in Release mode, or from the signed release apk. Android Studio throws an error:

02-01 13:16:40.650 12399-12424/? E/ReactNativeJS: undefined is not an object (evaluating 's.propTypes.style')

How can I fix this?

Answer 1

This is a bug that happens because two classes were moved to another package on version v0.19 of React Native: ReactProp ReactPropGroup. To fix this error, open your proguard-rules.pro and edit the following lines:

-keepclassmembers class *  { @com.facebook.react.uimanager.ReactProp <methods>; }
-keepclassmembers class *  { @com.facebook.react.uimanager.ReactPropGroup <methods>; }

for:

-keepclassmembers class *  { @com.facebook.react.uimanager.annotations.ReactProp <methods>; }
-keepclassmembers class *  { @com.facebook.react.uimanager.annotations.ReactPropGroup <methods>; }

Reference:

• [Android]Release crash "s.propTypes.style" #5655