The current value of the stream.
Is null before the first call to moveNext and after a call to moveNext completes with a false result or an error.
When a moveNext call completes with true, the current field holds the most recent event of the stream, and it stays like that until the next call to moveNext. Between a call to moveNext and when its returned future completes, the value is unspecified.
T get current;
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https://api.dart.dev/stable/2.5.0/dart-async/StreamIterator/current.html