createLocalJWKSet should not generate a TS error when called with immutable input

[matthieusieben]

What happened?

The following:

createLocalJWKSet({ keys: [] as readonly string[] } as const)

Generated this error:

The type 'readonly string[]' is 'readonly' and cannot be assigned to the mutable type 'JWK[]'.ts (4104)

Since the JWKS will be cloned by createLocalJWKSet, there should not be any issue with marking the input as readonly.

IMO this is important as freezing the jwks can prevent any alteration, making the code more consistent and safer.

Version

5.2.0

Runtime

Other (I will specify below)

Runtime Details

types

Code to reproduce

createLocalJWKSet({ keys: [] as readonly string[] } as const)

Required

• [X] I have searched the issues tracker and discussions for similar topics and couldn't find anything related.
• [X] I agree to follow this project's Code of Conduct

[matthieusieben]

Note: same goes for:

• importJWK

[panva]

If you wish to make a non-breaking suggestion to the type definitions then by all means please submit a PR. I'm not seeing typing inconveniences as major issues though.