From Element UI 2.x
This document will help you upgrade from Element 2.x to Element Plus.
Here is the list of breaking changes.
For now, check list of breaking changes for full details before more thorough documentation is available.
Vue 3 migration build
You may encounter some issues when using ElementPlus with Vue 3 migration build. Some of the components rely on Vue 3 internal API's. It's worth trying to adjust compatConfig mode to 3, either globally or per component in your project.