Pass the SlidingWindow to the features' __init__ to ensure it is sufficiently (and perhaps not excessively) sized.

[gaggioaxel]

Now on most of the features the logic is simply "until the window is not full return nan", but can be better designed passing the configured sliding window to do all the proper checks under the hood.
Eg. if a feature needs at least 10 samples to compute calculations, it should verify it and possibly expose a edge case desired behaviour.

Also, if a feature computes a heavy calculation on the whole window, and a too big window is passed, a Warning may be raised.