Single route file for multiple localized slugs (e.g. /corporate and /fr/entreprise)

[mehmetuken]

In TanStack Start (file-based routing), how can a single route file (e.g. routes/corporate.tsx) serve multiple real, crawlable paths with different slugs—/corporate and /fr/entreprise—without duplicate/alias files or route masking?

[schiller-manuel]

please expand on what you want to do and explain in more detail

[mehmetuken]

Goal
Use a single route file (e.g. routes/corporate.tsx) to serve multiple real, crawlable URLs with different localized slugs, e.g.:

• EN → /corporate
• FR → /fr/entreprise

Constraints / Why

• Must be real paths for SEO (localized slugs), not route masking.
• Need one source of truth (component, loader, head()), no duplicate or alias files.
• head() must know which variant matched for canonical/hreflang/sitemaps.
• We may add more locales later; the same single file should cover them.

What we tried

• {-$locale} works for prefix localization, but doesn’t support different slugs per locale (it yields /fr/corporate, not /fr/entreprise).
• Route Masking isn’t acceptable (UI-only, not real URLs).
• Virtual File Routes mapping both paths to the same module can't work. (Virtual File Router with multiple routes to same file errors #5009)

How can we accomplish this, map multiple concrete paths to a single route file—without alias/duplicate files or masking, and with head() knowing which variant matched?