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The profiler called React 19 use() and treated Context as a JSX component, so Streamdown threw on React 18. useContext plus Context.Provider is equivalent for this non-promise context and keeps React 19 working. Co-authored-by: Cursor <cursoragent@cursor.com>
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September 18, 2026 09:33
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Summary
@lobehub/streamdown@1.3.1peers React 19 and callsuse(Context)plus JSX<Context value>inStreamdownProfilerProvider. Apps still on React 18 fail at runtime withuse is not a functioneven after an npm override.This swaps
useforuseContextand rendersContext.Provider. That is equivalent for this non-promise context, so React 19 keeps working, and React 18 can mountStreamdown/CachedMarkdown.Peer range is
>=18so install no longer ERESOLVE on React 18.Test plan
useStreamdownProfilerreads the profiler throughuseContextpnpm test/pnpm type-checkon this branchMade with Cursor