fix(api): separate hreflang slugs from locale-switch navigation - #3462
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hellofanny wants to merge 11 commits into
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fix(api): separate hreflang slugs from locale-switch navigation#3462hellofanny wants to merge 11 commits into
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StoreProduct.otherLocales used the Intelligent Search linkText as the default locale's slug. IS localizes linkText to the locale being browsed, so while browsing a non-default locale the default-locale hreflang alternate — and the LocalizationSelector target built from it — pointed at the browsed locale's slug under the default locale's prefix, which 404s. Take every locale's slug from availableLinkIds, falling back to linkText only for the locale actually being browsed. Locales with no registered slug are omitted rather than guessed. Verified against pm2023team2 and brandless: the Catalog Dataplane returns availableLinkIds identically for every Accept-Language, while linkId and linkText are locale-specific. Co-authored-by: Cursor <cursoragent@cursor.com>
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Included review availability: 4 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour. WalkthroughThe VTEX product resolver now exposes ChangesVTEX localized product slugs
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The PR separates strict hreflang slug resolution from best-effort locale navigation to prevent broken alternate URLs while preserving selector behavior. No actionable merge-blocking risk remains after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant ProductPage
participant StoreProduct
participant CatalogDataplane
participant LocalizedProductContext
participant LocalizationButton
participant useBindingSelector
ProductPage->>StoreProduct: request defaultLocaleSlug
StoreProduct->>CatalogDataplane: retrieve localized product data
CatalogDataplane-->>StoreProduct: return availableLinkIds and linkText
StoreProduct-->>ProductPage: return otherLocales and defaultLocaleSlug
ProductPage->>LocalizedProductContext: provide defaultLocaleSlug
LocalizationButton->>useBindingSelector: pass locale data and defaultLocaleSlug
useBindingSelector->>useBindingSelector: resolve target slug
useBindingSelector-->>LocalizationButton: build localized PDP URL
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In `@packages/api/src/platforms/vtex/resolvers/product.ts`:
- Around line 327-341: The hreflang alternate construction around
availableLinkIds and linkId must remain reciprocal when Catalog Dataplane
provides only the default locale slug. Ensure the active locale’s resolved slug
is added to the alternate data consistently, without using
LocalizationSelector’s fallback behavior to advertise unsupported locale slugs,
and add a regression test resolving the same product from en-US and pt-BR to
verify both responses expose matching alternates.
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packages/api/src/platforms/vtex/resolvers/product.tspackages/api/test/unit/platforms/vtex/resolvers/product.test.ts
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StoreProduct.otherLocales fell back to the Intelligent Search linkText for the locale being browsed when that locale had no entry in availableLinkIds. Since availableLinkIds is the only locale-independent source, that fallback made the advertised set depend on which locale served the request: a pt-BR request emitted a pt-BR alternate that the en-US request for the same product could not know about, so the cluster was non-reciprocal and search engines discard it. Derive every slug from availableLinkIds. Locales with no registered slug are omitted, so a product with no translations advertises no alternates from any locale instead of a self-referencing tag that conveys nothing. Reproduced on pm2023team2 with product 880011, whose Catalog Dataplane availableLinkIds is empty: /en-us advertised en-US plus x-default while /pt-br advertised only pt-BR. Both now emit no alternates, while fully translated product 880009 still emits the same set from every locale. Co-authored-by: Cursor <cursoragent@cursor.com>
@faststore/api
@faststore/cli
@faststore/components
@faststore/core
@faststore/diagnostics
@faststore/lighthouse
@faststore/sdk
@faststore/ui
commit: |
The catch swallowed every failure, so a timeout or 5xx silently downgraded the PDP breadcrumb to the Intelligent Search category names, which are always in the account's default language. Combined with the PDP's default `revalidate: false`, a transient failure during page generation freezes an untranslated breadcrumb on that URL until a deploy or purge, with nothing recorded to diagnose it afterwards. Warn with the productId and locale, matching what the collection resolver already does for the same class of failure. Co-authored-by: Cursor <cursoragent@cursor.com>
Deriving every otherLocales slug from availableLinkIds made the field trustworthy for hreflang, but it also removed the only slug the LocalizationSelector had for a locale the catalog has not registered, so switching to such a locale dropped the shopper on the locale root instead of the product page. The two consumers need opposite tolerances. An hreflang annotation is a claim about the catalog and must never be guessed, since a wrong entry makes search engines discard the whole cluster. Navigation only has to land somewhere useful, and a wrong guess costs one recoverable 404. Add StoreProduct.defaultLocaleSlug, resolved from availableLinkIds[defaultLocale] and falling back to the Intelligent Search linkText. The fallback is sound where it matters: a product with no registrations carries the same slug in every locale, so linkText is the default-locale slug. It reuses the request-scoped Dataplane entry otherLocales already loads, so both fields cost a single call. availableLinkIds describes slug registrations, not content translation, and in VTEX those are independent. A product can have a translated name and description with no linkId registered, which is why omitting the locale from hreflang while still navigating to it is the correct split. Co-authored-by: Cursor <cursoragent@cursor.com>
The comment stated that the Intelligent Search linkText is always in the default locale. It follows the locale being browsed, which is the same misconception that made otherLocales advertise 404 hreflang alternates. The surrounding logic was already correct: it validates a mismatching slug against the Catalog Dataplane instead of trusting linkText. Only the comment claimed otherwise. Co-authored-by: Cursor <cursoragent@cursor.com>
hellofanny
changed the title
The redirect path in useBindingSelector had no coverage: the existing suite only exercises the pure helpers in bindingSelector and the sessionStorage round-trip, so the fallback introduced for defaultLocaleSlug shipped untested and failed the quality gate. Extract the resolution into resolveTargetSlug, alongside the other pure helpers, and cover every branch: a registered slug for the target locale, the default locale's slug when the target has none, defaultLocaleSlug when the map is empty or absent, and null when nothing is available so the caller still strips the stale slug. Also pins the rule that matters most, which no test asserted before: a slug registered for some third locale is never carried to the target. Co-authored-by: Cursor <cursoragent@cursor.com>
The redirect is the behavior this PR changes and it had no test at all: the suite only reached the pure helpers, so every branch that decides where a shopper lands after switching locale was unverified, and the quality gate failed on new code. Render the hook against a mocked three-locale config and assert the resulting URL for each branch: a slug registered for the target locale, a fallback through defaultLocaleSlug when the target has none, an untranslated product whose map is empty, the binding root when nothing is available, and the error path when no binding matches the currency. Two cases pin behavior no test enforced before — a slug registered for a third locale is never carried to the target, and the query string and hash survive the switch. Also covers LocalizedProductProvider, which normalizes absent values to null so consumers do not have to distinguish undefined from null. Coverage on the touched files: useBindingSelector 21% to 86%, LocalizedProductContext 20% to 100%. Co-authored-by: Cursor <cursoragent@cursor.com>
The button is where the page hands the selector its slug sources, and nothing verified that hand-off: a dropped argument would silently send shoppers to the locale root with every unit test still green. Assert the three arguments reaching useBindingSelector for a product page, a collection page, and a page with no provider at all. Co-authored-by: Cursor <cursoragent@cursor.com>
Three of the cases added for the quality gate bought coverage without buying confidence, and removing them leaves coverage on the touched files byte-identical: the button label assertion has nothing to do with this change, the LocalizedProductProvider file only checked that a provider forwards props, and most of the resolveTargetSlug cases restated at the function level the same branches the redirect test already asserts at the URL level. Keep one place testing the decision. The one branch that lived only in the pure test, a default locale present in the map while the target is absent, moves to the redirect test rather than being deleted with it. Co-authored-by: Cursor <cursoragent@cursor.com>
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eduardoformiga
approved these changes
Aug 28, 2026
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Summary
StoreProduct.otherLocalesfeeds both the PDPhreflangalternates and theLocalizationSelectortargets. Serving two consumers from one field forced asingle slug-resolution rule onto two problems with opposite tolerances, and both
ended up wrong:
linkTextas the default locale's slug, but IS localizeslinkTextto thelocale being browsed. While browsing a non-default locale, the
default-locale alternate pointed at the browsed locale's slug under the
default locale's prefix, which 404s.
linkTextfor the locale beingbrowsed made the advertised set depend on which locale served the request, so
locale variants of the same product advertised disjoint sets. Google discards
annotations that are not reciprocal.
Both defects come from using
linkTextas a stand-in for a registered slug.This PR makes
otherLocalesstrict — every slug fromavailableLinkIds, nofallback — and adds
StoreProduct.defaultLocaleSlugfor the navigation case,which is free to guess precisely because it never reaches an annotation.
otherLocalesdefaultLocaleSlugavailableLinkIdsonlyavailableLinkIds[default]thenlinkTextAgreed behavior
Confirmed with product. Store defaulting to
en-US, with a t-shirt translatedto pt-BR and not sold in fr-FR:
/en-us/tshirt/p/en-us/tshirt/p/pt-br/camisa/p/pt-br/camisa/p/pt-br/tshirt/p/pt-br/tshirt/p, even when the content renders in English/fr-fr/tshirt/por/fr-fr/camisa/pUntranslated content under a localized URL is a merchant setup problem, not
something the framework detects or routes around. That is what makes
defaultLocaleSlugsafe to guess: the destination is either a valid page or anhonest 404.
Mapping to this PR: a registered slug is served by
otherLocales; no registeredslug with the product available is served by
defaultLocaleSlug; an unavailableproduct is also served by
defaultLocaleSlug, and its 404 is the intendedoutcome.
Evidence (live, account
pm2023team2)Rendered output for product 880009 / SKU 12 with the pre-fix resolver, both
alternates returning 404:
The same
hrefLang="en-US"resolved to three different URLs depending on theserving locale, and
x-defaultinherited the translated slug. After the fix allthree locales emit the same set and
en-USpoints atfrench-door-refrigerator-1-12(200). The same broken output is stillobservable in production on a store running the released version.
For the reciprocity defect, product 880011 (empty
availableLinkIds) advertiseddisjoint sets:
Why
availableLinkIdsis the right sourceThe Catalog Dataplane returns
availableLinkIdsidentically for everyAccept-Language, whilelinkIdandlinkTextare locale-specific. Derivingthe whole set from a locale-independent source is what makes the cluster
reciprocal by construction:
No extra per-locale request is needed to obtain a trustworthy default-locale slug.
Untranslated products
Products with no registered translations return
availableLinkIds: {}and nowadvertise no alternates at all, from any locale. A self-only
hreflangtagconveys nothing, so nothing is lost, and the set stays consistent across locales.
Filling every configured locale with the untranslated slug was considered and
rejected. Those URLs do resolve (verified:
/pt-br/side-by-side-refrigerator-14/pand
/fr-fr/side-by-side-refrigerator-14/pboth return 200), but advertising alocale to a search engine is a claim about the catalog, and
availableLinkIdscannot substantiate it: the field describes slug registrations, not whether
the product is sold or translated in that locale. In VTEX slug and content
translation are independent — a product can carry a translated name and
description with no
linkIdregistered, and the reverse also occurs.Navigation needs no such guarantee, which is what the new field is for.
StoreProduct.defaultLocaleSlugAdditive nullable field, populated only when localization is enabled.
With
otherLocalesstrict, the selector has nothing to navigate to for anomitted locale and drops the shopper on the locale root — a regression against
the previous behavior, which kept them on the product page, and against the
agreed behavior above.
Resolution order is
availableLinkIds[defaultLocale], falling back tolinkText. The fallback is sound in the case that matters: a product with noregistrations carries the same slug in every locale, so
linkTextis thedefault-locale slug. A product translated for the browsed locale but not for the
default one still yields a wrong guess and a 404 — pre-existing behavior,
unchanged.
It reuses the request-scoped Dataplane entry
otherLocalesalready loads, soserving both fields costs a single call.
Wired through core: PDP query,
LocalizedProductProvider,useLocalizedProduct,useBindingSelector. The selector's fallback chain moved outside theotherLocales?.lengthguard so it also applies to untranslated products, whichis exactly the case where the set is empty.
Observability (separate concern, same file)
getLocalizedProductEntryswallowed every Catalog Dataplane failure. A timeoutor 5xx silently downgrades the PDP breadcrumb to the IS category names, which are
always in the account's default language — and with the PDP's default
revalidate: false, a transient failure during page generation freezes anuntranslated breadcrumb on that URL until a deploy or purge, with nothing
recorded to diagnose it afterwards.
This was investigated as the cause of a reported case of untranslated
breadcrumbs and not confirmed: direct Dataplane probes returned the
translated categories correctly. The logging stands on its own merit, since the
failure mode is invisible either way. Warns with
productIdand locale, matchingwhat
collection.tsalready does for the same class of failure. No behaviorchange.
A stale comment in
assertSkuMatchesSlugclaiming thatlinkTextis always inthe default locale is corrected in the same pass. It is the same misconception
that produced the 404 alternates; the surrounding logic was already validating
against the Dataplane rather than trusting
linkText.Out of scope
Live inspection of a localized storefront surfaced a separate and larger
canonical defect:
getStoreURL()resolves the binding fromwindow.location, soduring static generation it returns the default locale's binding, and every
localized page emits a canonical pointing at the default locale. It affects PDP
and PLP, contradicts the very
hreflangtags this PR fixes, and lives in@faststore/corerather than the BFF. The agreed behavior table above is itsspecification. Tracked separately and deliberately not bundled here.
Also left open: whether a locale that serves the product under the default slug
should appear in
hreflangat all. It does not today, which leaves such a pageself-canonical but outside any cluster. Answering it needs a per-locale
availability signal, not
availableLinkIds.Test plan
pnpm test:unitinpackages/api— 259 passingotherLocalescases: default locale resolved fromavailableLinkIdswhilebrowsing another locale; default locale omitted when absent from the map;
browsed locale omitted when it has no registered slug; no alternates when the
map is empty; same alternates whichever locale serves the product (reciprocity
regression)
defaultLocaleSlugcases: null when localization is disabled; resolved fromavailableLinkIds; falls back tolinkTextwhen the map is empty; null-safeon a Dataplane failure; shares the cached entry with
otherLocalespnpm testinpackages/core— 710 passingfor the target locale; the fallback through
defaultLocaleSlugwhen thetarget has none; a product with no registered translations at all; the binding
root when nothing is available; the error path when no binding matches the
currency. Two cases pin behavior nothing enforced before — a slug registered
for a third locale is never carried to the target, and the query string and
hash survive the switch
page, a collection page, and outside a provider — a dropped argument there
sends shoppers to the locale root with every other test still green
useBindingSelector21% → 86%,LocalizationButton6% → 77%,LocalizedProductContextandbindingSelectorat 100%tsc --noEmitinpackages/core— no errors undersrc/, none in the addedtest files
pm2023team2, rendering the pre-fix resolver andconfirming the 404 alternates, then the corrected output across three locales
confirm the PDP resolves; on a product without a registered slug for the
target locale, confirm the selector lands on the product page instead of the
locale root
Summary by CodeRabbit
New Features
Bug Fixes