is linking platform in required? In my tests just removing --incremental was enough.

@mraleph wrote

is linking platform in required? In my tests just removing --incremental was enough.

Yes, per what I see just removing incrementalCompilerByteStorePath: '' option still produces kernel file with empty methods in _Object&ListMixin^^#T0 class.

I am now really concerned that we might have this problem in hot-reload scenario. We need to test this. Also lets try to work with FE team to ensure that we have a way to produce partial Kernel files during testing to avoid overhead.

This PR is certainly just a workaround to unblock current implementation of flutter test --preview-dart-2. Besides concerns about hot reload, we will need working incremental compiler to have flutter test --preview-dart-2 reuse frontend compiler for multiple tests (#14728).

Also lets try to work with FE team to ensure that we have a way to produce partial Kernel files during testing to avoid overhead.

I'm in the middle of moving frontend_server to the dart sdk(main stumbling block is the fact that flutter frontend_server has flutter-specific widget inspector kernel transformation hardcoded, which I don't want to copy over to dart sdk), that should help with that a little.