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TypeError: __exportAll is not a function — the deploy that only breaks after you merge

Community description: published: false tags: vercel, nitro, tanstack, debugging Production went down twice in one day with...

Dev.to | Sep 14, 2026 | CAPTD

Automated excerpt

What __exportAll actually is It's a bundler helper. The module is already in the bundle, already loaded, already reachable through the static import. The branch's own preview deployment builds the branch tip. Read the built SSR output as an import graph and fail if a chunk that defines or imports the helper sits on an import cycle. If you fail the build on "helper found", you'll fail every build.

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