How do I reference the Vue instance in Vite?

I'm getting started with Vue 3 and Vite. How do I reference the Vue instance? I'm used to doing...

import Vue from 'vue'

but if I do this in my Vue3/Vite project, there's no default export in the vue module, so...

Uncaught SyntaxError: The requested module '/node_modules/.vite/vue.js?v=d734dbd3' does not provide an export named 'default'

I'm clearly having the same problem as this person. I want to do things like Vue.config, Vue.observable(), Vue.set(). There's something very basic that I'm missing. Anyone ?