Will my custom extension work with both Hyvä and Luma?
Yes, every extension we ship includes a Hyvä-compat module by default. We use the standard Hyvä compatibility module pattern (separate view/frontend directories under Hyva_*Compat) so the extension renders correctly on both Luma stores and Hyvä storefronts without code duplication. If you only need one frontend, we’ll happily skip the other and discount accordingly, tell us in the booking form.