Parsing of next.config.js rewrites' has objects value key

[nickrttn]

👋

I was wondering how the value key in the has array of objects for rewrites (and redirects) is parsed? Does it use path-to-regexp same as source and destination? Are they regular RegExp's?

The docs are not entirely clear about this.

Thanks in advance.

– Nick

[thibautsabot]

Hello!

Yes they are regexp, you can find the related code here: https://github.com/vercel/next.js/blob/canary/packages/next/lib/load-custom-routes.ts#L360

It's using matchAll.

Value is string | undefined.
If it's a string, it'll be used as a regex to capture a specific part of the value.
If it's not defined, it'll match anything.

[nickrttn]

Thank you!