@lwc/engine-server

LWC v4.0.0 contains breaking changes.

element.role -> element.getAttribute('role')

element.ariaLabel -> element.getAttribute('aria-label')

engine-dom: Remove ARIA reflection global polyfill (BREAKING CHANGE)

Generics for better typing (BREAKING CHANGE)

Use fragments for slots in light DOM (BREAKING CHANGE)

babel-plugin-component: Skip unnecessary registerDecorators (BREAKING CHANGE)

This is judged as extremely unlikely to break anyone, but it is technically a breaking change.

compiler: Remove object rest spread (BREAKING CHANGE)

childNodes