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Fun Fact: a person https://github.com/101arrowz recently created a ZSTD decompressor in Javascript (without any dependencies), which is only 7.1 kB (3.6 kB zipped) - here it is: https://unpkg.com/fzstd@0.0.2/umd/index.js (and it is quite fast, too).

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Thanks! This looks really useful. I've been using https://www.npmjs.com/package/zstd-codec which simply compiles the official implementation to WASM and wraps it up for JS use. It does include the compressor too, but the end result is quite dramatically larger (3MB unzipped).

You can compile only the decompressor of the official ZSTD library to wasm, it is ony 28 kB: https://github.com/facebook/zstd/files/6602821/zstd.zip

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