For AI agents: the complete documentation index is available at /llms.txt, the full documentation bundle is available at /llms-full.txt, and this page is available as Markdown at /api/react.mainthreadobjecttype.downcast.md.
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      • Home > @lynx-js/react > MainThreadObjectType > downcast

      MainThreadObjectType.downcast property

      Narrow a value to a source-runtime handle of this exact type.

      This does not create or access the realized main-thread object.

      Signature:

      readonly downcast: (value: unknown) => MainThreadObjectHandle<I, O> | undefined;