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Hi, I followed your Getting Started instructions with Vue 3 updated on 09 Mar 2022.
- Vue CLI v4.5.11
- vue-class-component : 8.0.0-rc.1
- [email protected]
and I think that there might be some problems with the Vue 3 version.
The rendered page is like this:


And here's the warning:
I think this might be occurred by the problem that Vue.extend is not supported anymore in Vue 3. But this rendering problem seems cannot be solved by simply replacing Vue.extend with Vue.defineComponent, Vue.createApp, or something else. By doing these, the warning won't show up but the rendering remained the same.
This spreadsheet component works well with Vue 2 on my PC.