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How Component Poisoning Silently Breaks Your Next.js App Performance

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In Next.js and React 19, directly importing a Server Component into a Client Component causes 'component poisoning,' a common architectural mistake in production codebases. This error forces server-only code into the client-side JavaScript bundle, stripping it of capabilities like direct database access and secure environment variable usage. The consequences include bloated bundles, runtime errors, and the complete loss of performance benefits that React Server Components are designed to provide. Developers can avoid this by adopting the Donut Pattern, where a Server Component is passed as children or props into a Client Component rather than imported directly. This composition approach preserves the serialization boundary between server and client, keeping heavy data-fetching logic on the server while allowing client components to manage interactivity.

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How Component Poisoning Silently Breaks Your Next.js App Performance · ShortSingh