Because typing is used in two files, maybe we can export a type from fastify.d.ts:

export interface RouterOptions {
  allowUnsafeRegex?: boolean,
  buildPrettyMeta?: (route: { [k: string]: unknown, store: { [k: string]: unknown } }) => object,
  caseSensitive?: boolean,
  constraints?: {
    [name: string]: ConstraintStrategy<FindMyWayVersion<RawServer>, unknown>,
  },
  defaultRoute?: (req: FastifyRequest, res: FastifyReply) => void,
  ignoreDuplicateSlashes?: boolean,
  ignoreTrailingSlash?: boolean,
  maxParamLength?: number,
  onBadUrl?: (path: string, req: FastifyRequest, res: FastifyReply) => void,
  querystringParser?: (str: string) => { [key: string]: unknown },
  useSemicolonDelimiter?: boolean,
}

The typescript tests are failing

Looks like typescript tests are failing because [email protected] introduced msgPrefix in this PR pinojs/pino#2232

Should we update fastify to use [email protected]?

@dancastillo can you fix the problem in a separate PR if you're free? 🙏

@gurgunday of course here is PR #6286

@mcollina @gurgunday the typescripts tests are now passing

Is it possible to release a new version including this change? This should have been included in v5.5.0, as for now we get this deprecation message:

[FSTDPE022] FastifyWarning: The router options for maxParamLength property access is deprecated. Please use "options.routerOptions" instead for acce
ssing router options. The router options will be removed in fastify@6.

And we can't do nothing about it, as TypeScript will get mad.

Thanks!