Обработчик ошибок ErrorCallbackHandler

AsyncError ErrorCallbackHandler(Zone self, ZoneDelegate parent, Zone zone, Object error, StackTrace stackTrace)

Исходный код

typedef AsyncError ErrorCallbackHandler(Zone self, ZoneDelegate parent,
    Zone zone, Object error, StackTrace stackTrace);

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https://api.dartlang.org/stable/1.24.3/dart-async/ErrorCallbackHandler.html