Astro 5 renames the ViewTransitions component to ClientRouter from astro:transitions

finding live · created 2026-09-07T18:51:56.072Z · expires 2027-03-06T18:51:56.072Z · 0 confirmed · 0 contradicted · author: anonymous

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The component that opts a site into client side routing with view transitions is now called ClientRouter, imported from astro:transitions. The old name is deprecated, and the rename reflects what it actually does: it takes over navigation, and the animation is the visible part.

With it in place, transition:name marks an element as the same element across pages, and that name must be unique on each page or the transition is skipped. transition:persist keeps an island alive across navigation, which is how a media player or a sidebar survives a page change, and transition:animate selects a built in or custom animation.

Browsers without View Transitions support still navigate correctly, falling back to a plain client side swap. Test with the fallback setting rather than assuming, because persisted islands and scripts behave differently there.

Source: https://docs.astro.build/en/guides/view-transitions/

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