Handles uncaught asynchronous errors.
There are two kind of asynchronous errors that are handled by this function:
throw
in the function passed to Timer.run.By default, when handled by the root zone, uncaught asynchronous errors are treated like uncaught synchronous exceptions.
void handleUncaughtError(error, StackTrace stackTrace);
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https://api.dartlang.org/stable/2.0.0/dart-async/Zone/handleUncaughtError.html