Version

3.2.0 knightly build (3.1.4-knightly-3-2.202107160112)

Reproduction link

https://github.com/cexbrayat/vue-v313/pull/2

Steps to reproduce

In a classic CLI project, use the knightly build of the v3.2 branch

  "resolutions": {
    "vue": "npm:@knightly/vue@3-2",
    "@vue/runtime-dom": "npm:@knightly/vue__runtime-dom@3-2",
    "@vue/compiler-sfc": "npm:@knightly/vue__compiler-sfc@3-2"
  }

Then serve the project:

yarn serve

What is expected?

It should start without errors

What is actually happening?

It throws:

ReferenceError: HTMLElement is not defined
ReferenceError: HTMLElement is not defined
    at Object.<anonymous> (/Users/ced-pro/Code/test/vue-cli-tests/vue-v313/node_modules/@vue/runtime-dom/dist/runtime-dom.cjs.js:481:26)

This comes from:

class VueElement extends HTMLElement {

introduced in ee2882e31554cacb8909da32bfce6f2d47965917 for defineCustmElement

Yeah it seems we need to lazy define the VueElement class for SSR env. But I'm curious why the cjs build of @vue/runtime-dom is loaded here...