missing "original" variable initiation

[kimamil]

Hi, your blog post helped me a lot as I head the same struggle as you did (vue3, typescript, SFCs and none of the other suggested configs helped). I wasn't able to get it to fully work yet, but I wanted to get some help back.

I think you're missing the initiation of the "original" variable:

I suggest to add a

let original = undefined;

to yield