TS Issues on routerOptions option? #1109

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1. AkhileshDasari commented on Jul 23, 2026

   

   AkhileshDasari

   on Jul 23, 2026

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   I would like to contribute to this issue.
2. metcoder95 commented on Jul 23, 2026

   

   metcoder95

   on Jul 23, 2026

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   Can you provide an Minimum Reproducible Example?
3. AkhileshDasari commented on Jul 23, 2026

   

   AkhileshDasari

   on Jul 23, 2026

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   Hi @metcoder95,

   Here's a Minimum Reproducible Example:

   import Fastify from 'fastify';
   
   const fastify = Fastify({
     routerOptions: {
       ignoreTrailingSlash: true,
       ignoreDuplicateSlashes: true,
     }
   });
   
   fastify.get('/', async () => ({ hello: 'world' }));
   
   await fastify.listen({ port: 3000 });

   Error:
   Property 'routerOptions' does not exist on type 'FastifyServerOptions<...>'
   Even though the runtime supports it and the deprecation warning tells us to use routerOptions, the TypeScript definitions don't expose this property yet.
   I'm happy to contribute a fix for the TypeScript definitions if you can point me to the right files. Thanks!
4. metcoder95 commented on Jul 24, 2026

   

   metcoder95

   on Jul 24, 2026

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   This has been fixed in latest fastify; can you try to upgrade to 5.10?