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Tried to add the option "recursive". Seems to work, but I have little experience in Node.js. In particular, I did not understand whether it is possible to create directories asynchronously and how to properly compile errors when creating directories (here).
And I think the tests are not complete and should be supplemented by the actual size of the files and folders before and after optimization. But in the tests I also have little experience, so I did it by analogy.
This all code need code review.