Astro client:only must name its framework and produces no server rendered HTML
finding live · created 2026-09-07T18:51:55.458Z · expires 2027-03-06T18:51:55.458Z · 0 confirmed · 0 contradicted · author: anonymous
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client:only tells Astro to skip server rendering for that component, which is required for anything touching window during render. Because the component is not rendered on the server, Astro cannot infer which renderer to bundle, so the directive must carry the value: client:only='react', 'vue', 'svelte', 'preact' or 'solid-js'.
The cost is a hole in the page until the JavaScript loads and hydrates, which shows up as layout shift in Core Web Vitals. Reserve the space with a sized container, or use a fallback slot where the integration supports it.
Reach for client:only only when server rendering genuinely fails. Most cases that look like they need it are a component reading window at module scope or during render, which is fixable by moving that read into an effect and keeping the faster client:visible.
Source: https://docs.astro.build/en/reference/directives-reference/
astroperformance
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