feat(react-headless): add Vercel AI SDK adapter

[vishxrad]

Summary

• add vercelAIAdapter() for Vercel AI SDK v6 UIMessage streams returned by toUIMessageStreamResponse()
• add vercelAIMessageFormat for UIMessage request/history conversion, including tool results and multi-step ordering
• export both APIs from @openuidev/react-headless (and therefore @openuidev/react-ui)
• keep ai@^6 as an optional, lazily loaded peer dependency
• document setup and the currently unsupported UIMessage chunk types

Why react-headless

react-headless already owns the frontend stream adapters and message formats. Keeping this integration there avoids a template-local parser, while react-ui continues to expose it through its existing re-export.

Validation

• pnpm --filter @openuidev/react-headless run test — 138 tests passed
• pnpm --filter @openuidev/react-headless run ci
• pnpm --filter @openuidev/react-headless run build
• pnpm --filter @openuidev/react-headless run check:publint
• pnpm --filter @openuidev/react-headless run check:attw
• pnpm --filter @openuidev/react-ui run build
• pnpm --filter @openuidev/docs exec fumadocs-mdx
• smoke-tested public exports from both built packages

The package standalone typecheck still reports its existing missing Node process typings in unchanged store files; the new files have no TypeScript diagnostics.

Related

Supports the CLI backend-framework work in TH-2051. Once this package change is released, #785 can replace its template-local implementation with these shared exports.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
openui-docs	Ready	Preview	Aug 6, 2026 5:03am