wrapError method

Object? wrapError(Object error, StackTrace stackTrace)

If any error is thrown by reduce or before, you have the chance to further process it by using wrapError. Usually this is used to wrap the error inside of another that better describes the failed action. For example, if some action converts a String into a number, then instead of throwing a FormatException you could do:

wrapError(error, _) => UserException("Please enter a valid number.", cause: error)

If you want to disable the error you can return null. For example, if you want to disable errors of type MyException:

wrapError(error, _) => (error is MyException) ? null : error

IMPORTANT: The action wrapError behaves differently from the global WrapError because returning null will DISABLE the error, while in the global WrapError returning null will keep the error unchanged. This difference is confusing, and I will, in the future, change the global WrapError to match the action.

Implementation

Object? wrapError(Object error, StackTrace stackTrace) => error;