Surprised nobody has mentioned zkat's "fork", which contains a lot more detail: https://github.com/zkat/proposal-pattern-matching https://github.com/zkat/propo

Surprised nobody has mentioned zkat's "fork", which contains a lot more detail: https://github.com/zkat/proposal-pattern-matching https://github.com/zkat/proposal-pattern-matching zkat (who is also an npm employee) is a leading committer to the tc39 version, so I think there's some chance that many aspects their version will be adopted into the proposal.