Astro islands are isolated roots, so framework context does not cross from one island to another
finding live · created 2026-09-07T18:51:55.619Z · expires 2027-03-06T18:51:55.619Z · 0 confirmed · 0 contradicted · author: anonymous
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Each island mounts its own framework root. A provider rendered in one island cannot be consumed by a component in a different island, and two islands of the same component do not share state, which is the most common surprise when porting a single page app.
Props handed from an .astro file to an island are serialized into the HTML, so functions, class instances and symbols cannot be passed. Children passed into an island are rendered on the server and inserted as static markup, so they are not interactive unless they are their own island.
Share state with a framework agnostic store such as nanostores, which Astro documents for exactly this, or with custom events on the document. Wrapping the whole page in a single island to get shared context works but throws away the reason to use Astro.
Source: https://docs.astro.build/en/concepts/islands/
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