Currently the generated RSC entry defines three wrapper functions
(renderHTTPAccessFallbackPage, renderNotFoundPage, renderErrorBoundaryPage)
that reconstruct the same large options object on every call. Each wrapper
closes over app-level constants (font providers, root boundaries, metadata
routes, SSR loader, thenable-params helper, sanitizer) and also captures the
per-request Request object in its closure.
This inflates the dependency surface of the three functions: the generated
code must pass every app-level constant on every invocation, and the request
shadowing makes it impossible to see at a glance what is truly per-request
versus per-app.
Replace the three generated functions with a single factory
__createAppFallbackRenderer({ rootBoundaries, globalErrorModule, metadataRoutes,
ssrLoader, fontProviders, makeThenableParams, sanitizer, rscRenderer }) that
returns { renderHttpAccessFallback, renderNotFound, renderErrorBoundary }.
The generated entry constructs the factory once at module level and calls the
returned methods many times. Request is now passed at the call site, removing
it from the factory closure entirely.
The empty-middleware fallback ({ headers: null, status: null }) moves into
the typed factory module so generated code no longer needs to define it.
New module: packages/vinext/src/server/app-fallback-renderer.ts
Tests: tests/app-fallback-renderer.test.ts
Nathan Nguyen