I've seen that this project is no longer maintained, but I wanted to share this experience nonetheless, so other people are aware of this.

When I specify typescript as a proptype it won't use it, but instead will (wrongfully) fall back to other registered plugins. I've made a demo repo where you can see this behavior. It also implements a native highlight solution, bypassing this component entirely.

Since this package is no longer maintained and the work-around is so simple. Maybe it is an idea that this plugin no longer should be recommended on the Readme of highlight.js?

You can clone the repo below to get a minified code-sample of the situation I'm describing.
https://github.com/JeffreyArts/demo-bug-vue-highlight-js