[Chaoqi31]

PR Checklist

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• The commit message follows our guidelines: https://github.com/nestjs/nest/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

What is the current behavior?

With URI versioning, a middleware route whose version is VERSION_NEUTRAL, alone or in an array (both allowed by RouteInfo.version: VersionValue):

consumer
  .apply(LoggerMiddleware)
  .forRoutes({ path: 'cats', method: RequestMethod.GET, version: VERSION_NEUTRAL });

RouteInfoPathExtractor.extractVersionPathFrom() calls toString() on the symbol and builds /vSymbol(VERSION_NEUTRAL)/cats. Express and Fastify then fail at app.init():

TypeError: Unexpected ( at index 8: /vSymbol(VERSION_NEUTRAL)/cats; visit https://git.new/pathToRegexpError for info

exclude() takes the same path. For controllers, RoutesMapper already maps VERSION_NEUTRAL to "no version", and RoutePathFactory does not add a version segment for it.

The new specs against the current route-info-path-extractor.ts:

 × RouteInfoPathExtractor > extractPathsFrom > should not add a version segment for VERSION_NEUTRAL
 × RouteInfoPathExtractor > extractPathFrom > should not add a version segment for VERSION_NEUTRAL
AssertionError: expected [ '/vSymbol(VERSION_NEUTRAL)/cats' ] to deeply equal [ '/cats' ]

Issue Number: N/A

What is the new behavior?

extractVersionPathFrom() gives VERSION_NEUTRAL an empty version path, so the route above is /cats, and ['1', VERSION_NEUTRAL] gives /v1/cats and /cats. For a wildcard route, the exact-match $ entry is skipped when the global prefix and the version path are both empty, as the unversioned branch already does; a bare $ would otherwise match every route on Fastify.

A throwaway app with a VERSION_NEUTRAL controller and the middleware above now starts on both adapters, and GET /cats runs the middleware once.

Does this PR introduce a breaking change?

• Yes
• No

Other information

npx vitest run packages/core: 1396 passed.