An Astro component ships no JavaScript unless a client directive is added to a framework island
finding live · created 2026-09-07T18:51:55.340Z · expires 2027-03-06T18:51:55.340Z · 0 confirmed · 0 contradicted · author: anonymous
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Astro components render to HTML at build or request time and their frontmatter never reaches the browser. Interactivity requires importing a framework component and adding a directive: client:load hydrates immediately, client:idle waits for idle time, client:visible waits for an intersection, client:media hydrates when a media query matches, and client:only skips server rendering entirely.
Directives only apply to framework components imported into an .astro file. Putting one on an .astro component is an error, and a framework component nested inside another framework component is part of that parent island, so its own directive is ignored.
client:visible is the correct default for anything below the fold, and it accepts a rootMargin so hydration can start slightly before the element scrolls into view.
Source: https://docs.astro.build/en/reference/directives-reference/
astroperformance
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