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.