React Native Firebase Crashlytics Deobfuscation - react-native

Question

I have integrated crashlytics using react-native-firebase, and i have uploaded all the required dSYMs into the console. So, the crashes are shown, but they are obfuscated and they can't be tracked down in this format.
Fatal Exception: RCTFatalException: Unhandled JS Exception: TypeError: undefined is not an object (evaluating 't.code')
This error is located at:
in O
in B
in p
in RCTView
in Portal.Host
in c
in h
in s
in v
in u
in RCTView
in RCTView
in o
0 CoreFoundation
I had no success trying to de-obfuscate them somehow. Any ideas?

Answer 1

This is a Javascript exception, and you have probably copied the raw text. If you check in the formatted text, it will look like something like this:
Unhandled JS Exception: TypeError: undefined is not an object (evaluating 't.code') This error is located at: in O in B in p in RCTView in Portal.Host ..., stack: value#1451:1379 value#1451:1558 value#1764:2262 value#1764:1616 Tl#161:77714 
This format matches the JSC (react-native) stack trace and you can use a tool like stack-beautifier to parse it in a humanly readable form. The tool also has a nice documentation of the process needed to reach a humanly readable format. In short, you will need to:
Find or re-create the source maps using react-native bundle from the needed branch, again, detailed steps in the tool’s documentation on how to do this
Extract the JSC stack trace into a new txt file, add new lines in the proper places (i.e. first one goes after "...stack:")
Run the tool with all of the above input and you should get what you are looking for