* use `Fragment` as the default element for `Transition` components
* update tests to reflect default tag change
* only error on missing `ref` if it's actually required
If the `<Transition />` component "root" is used as a root placeholder
(for state management) and not making actual transitions itself, then we
don't require a `ref` element.
* add test to ensure we don't error on missing `ref` when not required
+ add `className="…"` to some places to indicate that we _do_ want to
perform a transition and thus have to fail if the `ref` is missing.
* improve `requiresRef` check
Also ensure that a ref is required if the `as` prop is provided and
it's not a `Fragment`
* add `shouldForwardRef` helper
* fix broken tests
These tests were rendering a `Debug` element that didn't render any DOM
nodes. Adding `as="div"` ensures that we are forwarding the ref
correctly.
* update changelog
* update playgrounds to reflect tag change
* Tweak changelog
---------
Co-authored-by: Jonathan Reinink <jonathan@reinink.ca>
* bump Next in playground
* convert legacy Link after Next.js bump
* update yarn.lock
* switch to npm workspaces
* move `packages/playground-*` to `playgrounds/*`
* use `npm` instead of `yarn`
* sync package-lock.json
* use node 20 for insiders releases
Robin Malfait