peek package:conduit

peek :: Monad m => ConduitT a o m (Maybe a)
conduit Data.Conduit.Combinators
View the next value in the stream without consuming it.
peek :: Monad m => ConduitT a o m (Maybe a)
conduit Data.Conduit.List
Look at the next value in the stream, if available. This function will not change the state of the stream. Since 0.3.0
peekC :: Monad m => ConduitT a o m (Maybe a)
conduit Conduit
View the next value in the stream without consuming it.
peekCE :: (Monad m, MonoFoldable mono) => ConduitT mono o m (Maybe (Element mono))
conduit Conduit
View the next element in the chunked stream without consuming it.
peekForever :: Monad m => ConduitT i o m () -> ConduitT i o m ()
conduit Conduit Data.Conduit.Combinators
Run a consuming conduit repeatedly, only stopping when there is no more data available from upstream.
peekForeverE :: (Monad m, MonoFoldable i) => ConduitT i o m () -> ConduitT i o m ()
conduit Conduit Data.Conduit.Combinators
Run a consuming conduit repeatedly, only stopping when there is no more data available from upstream. In contrast to peekForever, this function will ignore empty chunks of data. So for example, if a stream of data contains an empty ByteString, it is still treated as empty, and the consuming function is not called.
peekE :: (Monad m, MonoFoldable mono) => ConduitT mono o m (Maybe (Element mono))
conduit Data.Conduit.Combinators
View the next element in the chunked stream without consuming it.