node-unar
ESM front-end to unar and lsar a command line tool. The universal un-archiver/unpacker to a lot of formats: .zip, zipx, rar, 7z, tar, gzip, bzip2, lzma, cab, msi, cpio, xar, exe, etc...
xar-js
JS library and command-line utility for reading and writing 'xar' archives (used by Safari extensions)