Module '"vue"' has no exported member 'Fragment'
When I was developing a library compatible with Vue2 & 3, I often encountered work that could not continue because the two packages did not export similar modules.
For example, I wanted to assert whether the current VNode type is Fragment. I Can't import Fragment from Vue for comparison because ESM doesn't allow destructuring imports that don't exist, and if I use import * as Vue from 'vue' and Vue.Fragment, it won't be tree-shaking friendly.
Overall, this library smooths out the inconsistency of Vue2 & 3 modules export. If a module doesn't exist, it will be exported as undefined in Vue2.