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AI SDK 7.0.163 Added Two Stream Parts in a Patch Release. My Exhaustive Switch Stopped Compiling

If you loop over fullStream from streamText and switch on part.type with an assertNever fallback, bumping ai from 7.0.162 to anything from 7.0.163 up will break your type check. Nothing is wrong at runtime. The union just got two new members in a patch release. I hit this on purpose to see exactly…

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  1. 2026-11-09 02:44 · DEV Community — AI
    AI SDK 7.0.163 Added Two Stream Parts in a Patch Release. My Exhaustive Switch Stopped Compiling

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