fix(build): validate generated CDN warm path params

[james-elicx]

Summary

• reject malformed getStaticPaths entries before they can invent or collapse CDN warm keys
• validate App generateStaticParams string-versus-array parameter shapes against the route pattern
• surface invalid generator return shapes during CDN path discovery instead of silently treating them as an empty result

Next.js reference

The validation mirrors packages/next/src/build/static-paths/pages.ts: entry keys are limited to params/locale, ordinary params are strings, catch-all params are string arrays, and query-bearing string entries cannot be silently normalized into another path.

Scope

This validation is used by build-discovered CDN warm paths. The existing non-discovery prerender fallback for malformed App generator values is preserved.

Validation

• 54 focused discovery/endpoint tests passed
• targeted format, lint, and type checks passed

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/@vinext/cloudflare@3047

npm i https://pkg.pr.new/create-vinext-app@3047

npm i https://pkg.pr.new/@vinext/types@3047

npm i https://pkg.pr.new/vinext@3047

commit: 34d2ecc

[github-actions]

Example	Preview	Production	Original
app-router-cloudflare	preview	production
pages-router-cloudflare	preview	production
app-router-playground	preview	production	original
realworld-api-rest	preview	production
nextra-docs-template	preview	production
benchmarks	preview	production
hackernews	preview	production	original
workers-cache	preview	production
web	preview	production

[github-actions]

Performance benchmarks

Compared 34d2ecc against base fa424bc using alternating same-runner rounds. Next.js was unchanged and skipped.

0 improved · 0 regressed · 6 within ±1.5%

Scenario	Framework	Baseline	Current	Change
Client bundle size (gzip)	vinext	142.2 KB	142.2 KB	⚫ 0.0%
Client entry size (gzip)	vinext	129.5 KB	129.5 KB	⚫ -0.0%
Dev server cold start	vinext	3.13 s	3.10 s	⚫ -1.0%
Production build time	vinext	3.57 s	3.59 s	⚫ +0.5%
RSC entry closure size (gzip)	vinext	116.0 KB	116.1 KB	⚫ +0.1%
Server bundle size (gzip)	vinext	197.5 KB	197.6 KB	⚫ +0.1%

View detailed results and traces

_{🟢 improvement · 🔴 regression · ⚫ change below 1.5% · paired base/head}

[james-elicx]

Superseded by consolidated PR #3057. No commits were dropped or rewritten: #3057 now contains this exact linear commit as part of #3047–#3057. Closing only the redundant draft PR.