A combination of `runZoned` and `runZonedGuarded` where only the latter allows an `onError` parameter,
and only that has a nullable return type.
Retains the `onError` parameter on `runZoned` for now because it's too breaking to remove it until packages have been migrated off of it.
It will be removed in a follow-up CL.
Change-Id: If0e86c8d14e13fa089c66f4af975aeacb2616cf6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/137302
Reviewed-by: Jake Macdonald <jakemac@google.com>
Reviewed-by: Nate Bosch <nbosch@google.com>
Some changes were required to stream_transformer_test to make it strong
mode clean. Other minor changes involved migrating from unittest->test.
Bug:
Change-Id: Ia21144090710137e4803c651cf9e3fd62e17f5f7
Reviewed-on: https://dart-review.googlesource.com/3707
Reviewed-by: Lasse R.H. Nielsen <lrn@google.com>