Can we retrieve the line number of an error within React Native?

While working on my React Native app, I have noticed that the error messages generated by the iOS emulator do not specify the exact line in my code where the error occurred. The screenshot provided below shows an issue with the map() function within the Dashboard component. However, without a line number reference, it becomes challenging to pinpoint which instance of map() is causing the error if there are multiple occurrences within the Dashboard.

My query revolves around why React Native does not display the line number in such cases. Is this limitation inherent to React Native's functioning, making it impossible to identify the specific line? Alternatively, is there a way to structure my app differently to include error line numbers?

https://i.sstatic.net/p5XnG.png

Answer №1

Answer is negative in the majority of cases.

The screenshot you provided does not offer much insight into the source of the error.

To gain more information on state/props changes or exceptions, consider using the react native debugger. Stack trace may not be very helpful in this scenario. It might be beneficial to create your own global error handling function specifically for development environments. Keep in mind that not all errors are JavaScript-related; some may be thrown by native modules as well.

You can also utilize breakpoints and perform runtime debugging through the sources tab, or blackbox the entire script as needed. Debugging remains a significant challenge in React Native development.

Answer №2

If you're looking for a solution, consider using Rollbar as it may provide the answer you seek:

https://i.sstatic.net/F86dl.png

This tool is worth mentioning due to its accessibility to the community as it is free of charge. Additionally, it has the capability to capture error line numbers effectively!

Answer №3

https://i.sstatic.net/KZMaM.png

It's quite ridiculous that the console errors lack line numbers (on the right), while the simulator presents line numbers for the same error (on the left).

I advocate for developers to consistently include timestamps and line numbers in their debug logs.

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