fflate 0.8.2, as shipped inside three.js 0.184 (examples/jsm/libs/fflate.module.js).
Used for unzipping 3MF files and for writing the ZIP of per-object STL files.

Header of the shipped file, verbatim:

fflate - fast JavaScript compression/decompression
<https://101arrowz.github.io/fflate>
Licensed under MIT. https://github.com/101arrowz/fflate/blob/master/LICENSE
version 0.8.2

The MIT licence text of fflate is at the address above. The MIT licence text of three.js is in license.three.txt.