[Web]: Proposal to be able to build flutter web app with debug profile support

[arturk]

flutter build web command is used to generate release build of flutter application. But for testing purposes we need to deploy debug version of the application to the local server. We need the support of the builds where assert instructions are executed to be able to access the render tree of the deployed application. At the moment it is possible to do with flutter run -d chrome but that is not the command that is used to generate files that can be put into the server

So something like flutter build web --debug can be beneficial especially when there is flutter build web --profile already exists.

[longtimedeveloper]

UPDATE: I used the --profile option to get more information from the deployed app. We really need a build option that shows a stack trace with the exact line of code that is throwing the exception. Thank-you!!!!!!!!!!!!!!!

Earlier today.
Please add this capability. I'm getting a bizarre runtime error and can't get any information to correct it. At the moment, a critical app is down and can't be used.

[eggnstone]

We really need a build option that shows a stack trace with the exact line of code that is throwing the exception.

Agreed!
In the meantime this may help:
flutter build web --profile --dart-define=Dart2jsOptimization=O0
(taken from https://stackoverflow.com/a/64511666/837507)

[arturk]

We really need a build option that shows a stack trace with the exact line of code that is throwing the exception.

Agreed! In the meantime this may help: flutter build web --profile --dart-define=Dart2jsOptimization=O0 (taken from https://stackoverflow.com/a/64511666/837507)

This helps just a bit but does not provide full debug capabilities. For example in my tests in case of failure I attach to the report a widgets tree to shown what was on the screen during the failure and with what params. The flutter driver extension is capable of getting a widgets tree in debug mode but not in profile mode. I was still able to write a function that can collect a list of all widgets, but tree is way more comfortable.