Checklist

• I have looked into the Readme and Examples, and have not found a suitable solution or answer.
• I have searched the issues and have not found a suitable solution or answer.
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Description

When setting a custom fetcher via the options' fetcher property, the jwksUri option is not needed. Right now, jwksUri is not optional, so this raises a TS error.

Reproduction

const expressJwt = jwksClient.expressJwtSecret({
    jwksUri: undefined!, // Look how I had to add (!) to suppress the TS error
    fetcher: () => getAzureKeys(),
    cache: true,
    rateLimit: false,
});

Additional context

No response

jwks-rsa version

3.2.0

Node.js version

22