No, there's no implementation available yet, the proposal is still being discussed and not adopted
There is an implementation github.com/liximomo/vue-function-api
Right, we came across this userland implementation as well in the meantime, it's pretty cool :)
Considering all that's going on right now I haven't had the time to try it, and can't say wether I will find time to use it for bringing this example to life in the coming days.
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