ErrorCallbackHandler typedef
The type of a custom Zone.errorCallback implementation function.
Receives the Zone that the handler was registered on as self
,
a delegate forwarding to the handlers of self
's parent zone as parent
,
and the current zone where the error was uncaught as zone
,
which will have self
as a parent zone.
The error
and stackTrace
are the error and stack trace
passed to Zone.errorCallback of zone
.
The function should return either null
if it doesn't want
to replace the original error and stack trace,
or an AsyncError containing a replacement error and stack trace
which will be used to replace the originals.
The error callback handler must not throw.
The function must only access zone-related functionality through
self
, parent
or zone
.
It should not depend on the current zone (Zone.current).
Implementation
typedef ErrorCallbackHandler = AsyncError? Function(Zone self,
ZoneDelegate parent, Zone zone, Object error, StackTrace? stackTrace);