RegisterUnaryCallbackHandler тип данных

ZoneUnaryCallback<R, T> RegisterUnaryCallbackHandler(Зона self, Делегат зоны parent, Зона zone, R f(T arg))

Исходный код

typedef ZoneUnaryCallback<R, T> RegisterUnaryCallbackHandler<R, T>(
    Zone self, ZoneDelegate parent, Zone zone, R f(T arg));

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