The type of the elements in the source sequence.
The type of the elements in the projected inner sequences and the elements in the merged result sequence.
A transform function to apply to each element.
Optional thisArg: anyOption this for binding to the selector.
An operator that creates an async-iterable sequence whose elements are the result of invoking the one-to-many transform function on each element of the input sequence.
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Projects each element of an async-iterable sequence to an async-iterable sequence, emitting values only from the most recently projected async-iterable sequence.