- React Native supports debugging via Chrome Debugger (DevTools)
- Realm doesn't support debugging with JSC only with Hermes
- Since Chrome keeps getting updated on our machines, so even with hermes one needs to be at a certain version for chrome debuggers for specific versions of react native (and maybe realm also).
- The above problem is solved by Flipper (desktop app) which has an embedded chrome debugger - hence at fixed compatible version.
- For our code, Flipper Version 0.176.0 (50.0.0) has been tested to work.
When switching the JS engine
make clean_app is required.
enableHermesdefault value is false.
# switch to hermes enableHermes=true make clean_app run_app # continue to use hermes enableHermes=true make run_app # switch to JSC make clean_app run_app # continue to use JSC make run_app
make run_app log (not Metro) verify the engine by looking for
[Avni] Hermes Enabled:
If you are running JSC you will get a clear error when using the Hermes Debugger menu in Flipper. Do learn about Chrome debugger shortcuts. Command+P in sources to open a file.
Cannot debug the errors that happen on start-up of the app as by the time one attaches the Flipper the application may have crossed the code that one may be interested in debugging.
Updated 5 months ago