Next 16 proxy: URLPattern is not a constructor

[weak rover]

Hi, I’m trying to upgrade to Next 16 and now run into “URLPattern is not a constructor” for my proxy.ts. Checking its value it’s undefined. I’m importing it from next/server.

Applying a polyfil in instrumentation works locally but not on Vercel. Any ideas what could be going wrong? Weirdly enough docs recommend using this and I see no (recent) issues about this.

[ivory viper]

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[weak rover]

import "urlpattern-polyfill";

in proxy.ts instead of using instrumentation worked