If you already have node and npm installed, and are happy running random binaries from the internet, you can `npx magic-wormhole` to run this without any further setup. It just wraps wormhole-william, which is the go implementation of magic-wormhole.

I put it on npm primarily so I could send things to other JS developers an absolute minimum of fuss: one command, total, instead of installing a tool and then running the command.