https://medium.com/@lachlanmiller_52885/how-i-do-vue-in-2019-typescript-and-tsx-6b648a4decd3

In this article, I will talk about how I have been using Vue, and plan to do so in 2019. The main new technologies I’ve found useful over the last year have been TypeScript and .tsx instead of .vue files.

The main benefit of using .tsx over .vue files is typechecking in the render function - as far as I know, .vue files to not have typechecking in the section, or at least it is not very well supported.