Create Universal Libraries for Vue 2 and 3
"Vue Demi (demi means "half" in French) is a developing utility that allows you to write Universal Vue Libraries for Vue 2 & 3.
While it's a good solution for existing and mature libraries to use separate branches for targeted versions of their plugins, this may be too much maintenance work for small scale or new libraries that want to support both versions.
With Vue Demi you won't have to worry about users’ installed versions."