Poly is a Svelte 4 fork with the goal of long-term support. For now, we will focus on technical improvements with no API changes, but we may add additional incremental features in the future. It is not planned to deprecate any Svelte 4 APIs at this point in time, and, depending on adoption, they may never be deprecated.
Poly is fully compatible with Svelte 4. In particular existing code, including
code that uses <svelte:...> tags, should work flawlessly. Please file an
issue if your existing Svelte 4 code doesn't work in Poly.
If you're a user of SvelteKit, you will need to migrate your app to Primate, which is a full-stack framework that supports a multitude of backends and frontends, including Svelte. Support for Poly will be added in the coming days.
MIT
By contributing to Poly, you agree that your contributions will be licensed under its MIT license.