fix(vercel): prevent caching missing public assets - #4474
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Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review. 📝 WalkthroughWalkthroughThe Vercel preset now accepts route rules when generating public-asset routes. Existing ChangesVercel public asset caching
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🟡 Moderate · up to The Vercel asset-routing change correctly targets uncached missing-asset responses, but deployments that explicitly configure a zero asset cache lifetime can instead receive one-year immutable caching. This configuration regression should be fixed before merge. 🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
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Public asset rules were filtered only on `!fallthrough`. An explicit
`{ baseURL: "/", fallthrough: false }` produced a `/(.*)` source, which
now shadows the `/__server` fallback and 404s every dynamic route. The
runtime excludes the root base from `publicAssetBases` for the same
reason, as does Netlify's `getStaticPaths`.
The cache-control rule also hardcoded `max-age=31536000`, overriding the
route rule that `resolveAssetsOptions` derives from the directory's
`maxAge`. Build the header from `maxAge` instead, falling back to one
year when unset, as the AWS Amplify preset does.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012VP54CC6TuPL69Y3kvgAFr
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Inline comments:
In `@src/presets/vercel/utils.ts`:
- Around line 424-427: Update getPublicAssetRoutes to accept an options object
as its second parameter, with baseURL accessed from that object. Update every
caller and test to pass { baseURL } while preserving the existing
route-generation behavior.
- Line 432: Update the maxAge handling in the asset configuration flow to use
DEFAULT_PUBLIC_ASSET_MAX_AGE only when asset.maxAge is unset, preserving an
explicit value of 0. Add or update the unit fixture to verify zero remains zero
and is tested separately from the default case.
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docs/2.deploy/20.providers/vercel.mdsrc/presets/vercel/utils.tstest/presets/vercel.test.tstest/unit/vercel-public-asset-routes.test.ts
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A directory with a `maxAge` already gets a `cache-control` route rule from `resolveAssetsOptions`, which is emitted as its own route earlier in the routes array. The public asset rule repeated it and, having no `continue` before it, never applied anyway. Skipping the header when a `cache-control` route rule already matches the base also makes route rules an opt out of the one-year default, which `maxAge: 0` cannot express.
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Inline comments:
In `@test/presets/vercel.test.ts`:
- Line 496: Remove the extra arrow-function wrapper in the filter predicate near
the route callback so the predicate directly evaluates whether the route matches
the /build/(.*) cache-control route. Ensure filter() receives one callback and
excludes unrelated pre-filesystem routes.
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docs/2.deploy/20.providers/vercel.mdsrc/presets/vercel/utils.tstest/presets/vercel.test.tstest/unit/vercel-public-asset-routes.test.ts
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An explicit `maxAge: 0` on a non-fallthrough public asset directory no longer gets the one-year default header. Only a directory that never set `maxAge` does.
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🔗 Linked issue
Fixes #4427
❓ Type of change
📚 Description
On Vercel, a request for a public asset that does not exist (for example an old hashed chunk after a redeploy) fell through to the server function. The response, usually an HTML page, was then served with the
immutable, max-age=31536000header meant for assets, and browsers and the CDN cached it for a year.This PR makes a missing asset under a non-fallthrough public asset directory return a plain
404withCache-Control: no-storeat the Vercel edge, before it can reach the server function. This matches what the Nitro runtime and the other presets already do.{ "src": "/build/(.*)", "headers": { "cache-control": "public, max-age=3600, immutable" }, "continue": true }, { "handle": "filesystem" }, { "src": "/build/(.*)", "status": 404, "headers": { "cache-control": "no-store" } }While doing this, a few related problems in the same code were fixed:
/build(.*), which also matched/buildings. It is now/build/(.*), and regex characters in the base are escaped./) is skipped. A/(.*)rule would have applied to every response, and with the new 404 rule would have broken every dynamic route.maxAgeis respected. The header was hardcoded to one year regardless of the directory'smaxAge. It is now built frommaxAge, with one year as the default whenmaxAgeis not set.maxAge: 0means no caching. An explicit0no longer gets the one-year default. Only a directory that never setsmaxAgedoes.Docs for the Vercel preset explain the caching behaviour and how to opt out.
🧪 Tests
test/unit/vercel-public-asset-routes.test.ts) and themaxAgeresolution (test/unit/assets-resolver.test.ts).filesystemhandle.404withno-store, sibling paths and dynamic routes are unaffected.📝 Checklist
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