TL;DR

• The MiddlewareConfig type in Next.js v15.5.4 may need an update to include the runtime field as per the documentation.

Guidance

• Review the MiddlewareConfig type definition to confirm if the runtime field is indeed missing.
• Check the Next.js documentation and release notes for any updates or corrections related to the MiddlewareConfig type.
• Verify if there are any open issues or pull requests on the Next.js GitHub repository addressing this discrepancy.
• Consider reaching out to the Next.js community or maintainers for clarification on the intended usage of the runtime field with MiddlewareConfig.

Notes

• The issue seems to be related to a potential documentation inconsistency or a missing field in the type definition, rather than a code implementation problem.
• Without further information on the specific use case or error messages, it's challenging to provide a more detailed solution.

Recommendation

• Apply workaround: Use a different configuration approach that does not rely on the MiddlewareConfig type, or wait for an update to the Next.js documentation or type definitions that resolves the inconsistency.