(7/19) Cover export fallback server-only boundaries by feedthejim · Pull Request #93568 · vercel/next.js

feedthejim · 2026-05-07T03:46:40Z

Stack position

Part 7 of 19 in the output export dynamic fallback stack.

Previous PR: #93567 (6/19)
Next PR: #93559 (8/19)

Context

The stack is split so build-time output can land behind experimental.outputExportDynamicFallbacks before the client router behavior is enabled. The target behavior is for output: 'export' apps with parameterized App Router routes to emit fallback HTML/RSC artifacts that a later client can resolve for hard loads and soft navigations.

This PR scope: E2E coverage for unsupported server-only fallback routes.

Before adding client routing, this locks down the negative build-time behavior from the server-boundary PR so invalid fallback output does not quietly slip through.

What changed

Adds e2e coverage for server params and server request/data APIs under export dynamic fallbacks.
Covers expected build failures for unsupported Server Component usage.
Uses the shared export fallback helpers from the previous PR.

Deliberately not included

Does not test client soft navigation.
Does not add new fallback output formats.
Does not change runtime behavior.

Verification

After restacking and autosquashing, I verified the full stack with:

pnpm --filter=next build
pnpm testonly packages/next/src/lib/output-export-dynamic-fallback.test.ts packages/next/src/lib/output-export-fallback-routes.test.ts packages/next/src/export/helpers/output-export-fallback.test.ts packages/next/src/server/request/fallback-params.test.ts
pnpm testonly packages/next/src/client/output-export-fallback.test.ts packages/next/src/client/components/router-reducer/fetch-server-response.test.ts packages/next/src/client/components/router-reducer/create-initial-router-state.test.ts packages/next/src/client/components/segment-cache/cache.test.ts packages/next/src/client/components/segment-cache/vary-path.test.ts
pnpm testonly packages/next/src/client/components/router-reducer/compute-changed-path.test.ts packages/next/src/client/flight-data-helpers.test.ts packages/next/src/server/app-render/postponed-state.test.ts
pnpm test-start-turbo test/e2e/app-dir-export/test/dynamic-fallback-cache-components.test.ts test/e2e/app-dir-export/test/dynamic-fallback-route-shapes-cache-components.test.ts test/e2e/app-dir-export/test/dynamic-fallback-cache-components-basepath.test.ts test/e2e/app-dir-export/test/dynamic-fallback-optimizations-cache-components.test.ts test/e2e/app-dir-export/test/dynamic-fallback-known-params-cache-components.test.ts test/e2e/app-dir-export/test/dynamic-fallback-conflict.test.ts
pnpm test-start-turbo test/e2e/app-dir/output-export-dynamic-fallbacks/output-export-dynamic-fallbacks.test.ts test/e2e/app-dir-export/test/output-export-server-io.test.ts test/e2e/app-dir-export/test/output-export-server-io-use-cache.test.ts test/e2e/app-dir-export/test/dynamic-fallback-server-params.test.ts

github-actions · 2026-05-07T04:19:03Z

Tests Passed

Commit: 4129377

github-actions · 2026-05-07T04:21:32Z

Stats from current PR

🔴 1 regression

Metric	Canary	PR	Change	Trend
node_modules Size	505 MB	505 MB	🔴 +405 kB (+0%)	▁████

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Size: Changes < 1KB AND < 1% are insignificant
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⚡ Dev Server

Metric	Canary	PR	Change	Trend
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📦 Dev Server (Webpack)

Metric	Canary	PR	Change	Trend
Cold (Listen)	811ms	811ms	✓	█████
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Cold (First Request)	3.257s	3.261s	✓	▂▃▆▆▃
Warm (Listen)	810ms	812ms	✓	█████
Warm (Ready in log)	780ms	788ms	✓	▆▆█▇▇
Warm (First Request)	3.279s	3.256s	✓	▃▄▇▆▅

⚡ Production Builds

Metric	Canary	PR	Change	Trend
Fresh Build	4.668s	4.728s	✓	▆▆▃▇▇
Cached Build	4.709s	4.711s	✓	▆▇▁█▅

📦 Production Builds (Webpack) (Legacy)

📦 Production Builds (Webpack)

Metric	Canary	PR	Change	Trend
Fresh Build	23.624s	23.831s	✓	▃▃▄▄▄
Cached Build	23.751s	23.872s	✓	▄▄▆▅▅
node_modules Size	505 MB	505 MB	🔴 +405 kB (+0%)	▁████

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📝 Changed Files (17 files)

Files with changes:

app-page-exp..ntime.dev.js
app-page-exp..time.prod.js
app-page-tur..ntime.dev.js
app-page-tur..time.prod.js
app-page-tur..ntime.dev.js
app-page-tur..time.prod.js
app-page.runtime.dev.js
app-page.runtime.prod.js
app-route-ex..ntime.dev.js
app-route-ex..time.prod.js
app-route-tu..ntime.dev.js
app-route-tu..time.prod.js
app-route-tu..ntime.dev.js
app-route-tu..time.prod.js
app-route.runtime.dev.js
app-route.ru..time.prod.js
server.runtime.prod.js

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📎 Tarball URL

https://vercel-packages.vercel.app/next/commits/6618a7991798414d67c613982a75de95e600ebea/next

Commit: 6618a79

github-actions Bot added created-by: Next.js team PRs by the Next.js team. tests labels May 7, 2026

feedthejim changed the title ~~Cover export fallback server-only boundaries~~ (7/19) Cover export fallback server-only boundaries May 7, 2026

feedthejim force-pushed the feedthejim/export-dynamic-fallback-test-helpers branch from 5eea6a8 to 8277cf8 Compare May 7, 2026 04:25

feedthejim force-pushed the feedthejim/export-dynamic-fallback-server-boundary-e2e branch from 4082fec to 5754fe7 Compare May 7, 2026 04:25

feedthejim force-pushed the feedthejim/export-dynamic-fallback-test-helpers branch from 8277cf8 to fc171ad Compare May 7, 2026 04:55

feedthejim force-pushed the feedthejim/export-dynamic-fallback-server-boundary-e2e branch 2 times, most recently from 55911a7 to 9c747f0 Compare May 7, 2026 05:37

feedthejim force-pushed the feedthejim/export-dynamic-fallback-test-helpers branch from fc171ad to 71777c9 Compare May 7, 2026 05:37

feedthejim force-pushed the feedthejim/export-dynamic-fallback-server-boundary-e2e branch from 9c747f0 to 6618a79 Compare May 7, 2026 13:56

Cover export fallback server-only boundaries

4129377

feedthejim force-pushed the feedthejim/export-dynamic-fallback-test-helpers branch from 0ee05f0 to cc56ef4 Compare May 7, 2026 15:47

feedthejim force-pushed the feedthejim/export-dynamic-fallback-server-boundary-e2e branch from 6618a79 to 4129377 Compare May 7, 2026 15:47

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(7/19) Cover export fallback server-only boundaries#93568

(7/19) Cover export fallback server-only boundaries#93568
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feedthejim commented May 7, 2026 •

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github-actions Bot commented May 7, 2026 •

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