fix: resolve image demo /api/image 500 on Vercel#253
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ctate merged 1 commit intovercel-labs:mainfrom Apr 7, 2026
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Add outputFileTracingIncludes so the Geist font TTF is bundled at the symlink path the code reads from. In a pnpm monorepo the file was only traced at the .pnpm store path, which Vercel does not map back to the node_modules/geist/ symlink.
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@vzt7 is attempting to deploy a commit to the Vercel Labs Team on Vercel. A member of the Team first needs to authorize it. |
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@vzt7 Thanks for the contribution and the thorough root cause analysis! |
Ari4ka
approved these changes
Apr 7, 2026
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Summary
The
/api/imageendpoint returns 500 onimage-demo.json-render.dev.Root cause
The image API uses Satori + resvg to render JSON specs into PNG. Satori requires font data passed as an
ArrayBuffer, which the route loads viafs.readFilefrom:In a pnpm monorepo,
node_modules/geistis a symlink pointing to the real location insidenode_modules/.pnpm/geist@.../. Next.js file tracing (nft) traces the real path in the.pnpmstore, but when Vercel assembles the serverless function it copies only the real file — the symlink atnode_modules/geist/...does not exist in the function filesystem. SoreadFilethrowsENOENTand the unhandled error surfaces as a 500.Fix
Added
outputFileTracingIncludesinnext.config.tsto explicitly include the font file at the symlink path, ensuring it is present where the code expects it.Test plan
next start—/api/imagereturns 200 with valid PNG