I added basic support for zlib and gzip input (little validation - focused on performance and file size), as well as autodetection of format. This makes the API a lot easier to use for those with zlib/gzip data. I also added JSDoc and type annotations for the methods, which allows for better autocomplete and TypeScript support.

Possibly most importantly of all, I made the second parameter (the output array) optional, so that those without knowledge of the output size can still use this awesome library. It will automatically use an (admittedly inefficient) standard array to store the result of the decompression before switching to a Uint8Array. If the data is gzipped, a header tells us the output file size, so we use that to maximize memory efficiency. The new API is still 100% compatible with the old API.

Thanks for creating this wonderful library!