Support metadata routes in --debug-build-paths#95788
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The pattern resolution only admitted page.* and route.* files via a hand-rolled check, silently dropping metadata route files like opengraph-image.tsx or sitemap.ts, which are route-defining files too. It now uses the same file matcher that route discovery uses to collect app paths, so both sides agree on what a route file is. The resolution is moved from the CLI into the build, where the loaded config is available, so that route files with custom page extensions are matched.
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Extracted from #95468.
@lubieowoce asked me to use
--debug-build-pathsin a test, but it didn't work for route handlers because this flag was using a homecooked regex that doesn't match App Router's actual mechanism.Making it use the actual App Router matching involves moving some resolution around and threading things through.
This is for a debug-only (test-only?) helper.