As I was trying to add a custom validation pattern to Ajv through the ajv.onCreate property, as suggested in the fastify/ajv-compiler documentation, I incurred in a TS error for the FastifyServerOptions that although proxies the entire ajv property to the fastify/ajv-compiler builder method, does not expose correctly all of its properties into the typings.

This small change in the typings correctly exposes the available options, and should be future proof as the type is directly derived from the fastify/ajv-compiler types.

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct