fix(react-email): use project root as outputFileTracingRoot in email build#3576
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…build The generated .react-email/next.config.mjs set outputFileTracingRoot and turbopack.root to previewServerLocation (the .react-email subfolder). Next.js file tracing and @vercel/next expect the tracing root to be the project root, so every traced server-function path was off by the .react-email prefix and vercel build failed with ENOENT (e.g. jsx-runtime/jsx-dev-runtime.js). Point the non-monorepo tracing root at userProjectLocation (the parent of .react-email), mirroring the monorepo layout that already deploys. Extracted the decision into a pure, unit-tested getTracingRootExpression helper. Closes resend#3557
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Confidence score: 5/5
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Requires human review: Alters generated deployment config for Next.js file tracing; fix is targeted but affects vercel build, requiring human review for deployment impact.
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Auto-approved: Fix a Vercel deployment bug by correcting the file tracing root path. Single-line change in build config with low risk and clear rationale.
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The generated
.react-email/next.config.mjssetoutputFileTracingRootandturbopack.roottopreviewServerLocation(the.react-emailsubfolder). Next.js file tracing and@vercel/nextexpect the tracing root to be the project root, so every traced server-function path was off by the.react-emailprefix andvercel buildfailed withENOENT(e.g.jsx-runtime/jsx-dev-runtime.js). Localemail buildworked; onlyvercel buildfailed.This points the non-monorepo tracing root at
userProjectLocation(the parent of.react-email), mirroring the monorepo layout that already deploys. I pulled the decision into a small puregetTracingRootExpressionhelper and added unit tests for both branches. The monorepo path is unchanged.Closes #3557
Summary by cubic
Fixes Vercel deploys of the
react-emailpreview app by tracing from the user's project root in the generated.react-email/next.config.mjs. Non-monorepo builds now useuserProjectLocation; monorepo behavior is unchanged.outputFileTracingRootandturbopack.rootto the project root instead of.react-email, preventing ENOENT duringvercel build(e.g.,jsx-runtime/jsx-dev-runtime.js).Closes #3557
Written for commit cd0e05b. Summary will update on new commits.