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fix: add | undefined to transport option callbacks for exactOptionalPropertyTypes (#1855)

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Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Christian Sidak 2026-05-03 18:12:25 -07:00 • committed by GitHub
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'@modelcontextprotocol/server': patch
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Add `| undefined` to optional callback and function properties on `WebStandardStreamableHTTPServerTransportOptions` (`sessionIdGenerator`, `onsessioninitialized`, `onsessionclosed`) and corresponding private fields.
This fixes TS2430 errors for consumers using `exactOptionalPropertyTypes: true` without `skipLibCheck`, where optional properties with function types need explicit `| undefined` to match their emitted declarations.