Should this be an RFC?

• This is not a substantial change

Which package is this a feature request for?

React (@lit/react)

Description

@lit/react appears to work in React 19 in my limited testing. The only issue is that this line in package.json needs to be updated to add || 19

I understand that React 19 supports custom elements, removing the need for wrappers. However, to smooth the ecosystem migration, it might be a good idea to support wrappers in React 19 too.

Use cases:

• Forcing people to refactor out all wrappers usages and drop @lit/react before adopting React 19 is going to make the migration burden harder. Better let people gradually adopt React 19 and drop wrappers afterward.
• In a monorepo, some packages might update to React 19 before others
  • Example: updating storybook may require updating to React 19, while the code is not ready to
• Using wrappers may have better DX because IDEs can auto-import them on usages, and detect needless imports (assuming the package that uses @lit/react has separate entrypoint for each component wrapper, with a side effect import of the component inside) - not so for side-effect component imports.

Alternatives and Workarounds

Use yarn/npm "resolutions" to force @llit/react to work with @types/react@19.