fix: resolve React useId SSR hydration mismatch#8433
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GiveMe-A-Name merged 3 commits intomainfrom Mar 12, 2026
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- Add SSR_HYDRATION_ID_PREFIX constant in @modern-js/utils - Pass identifierPrefix to renderToString (string SSR) - Pass identifierPrefix to renderToPipeableStream (stream SSR Node.js) - Pass identifierPrefix to renderToReadableStream (stream SSR Edge) - Pass identifierPrefix to hydrateRoot (client hydration) - Add integration test for useId SSR hydration Closes #8363
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GiveMe-A-Name
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Mar 10, 2026
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Mar 12, 2026
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Summary
This PR fixes a hydration mismatch issue when using React's
useIdhook in SSR mode. The fix ensures consistent ID generation between server and client by introducing a newuseIdconfiguration option in the Modern.js runtime, allowing users to specify a unique identifier to prevent ID conflicts during hydration. Includes integration tests for SSR useId scenarios.