Hi Gordon! Nice to meet you :) I am the author of the article, and I am quite fond of Espruino, it's a great project. Wasn't aware that Espruino has FFI API!
Hi! Thanks, v7 looked great too. mJS looks like a good idea - IMO it'd be nice to standardise a sane, minimal subset of JS that can be easily implemented - it'd be a huge help for all the developers of embedded JS interpreters, and could potentially be targeted by transpilers too.