Cloudflare renamed its Workers Vitest package on 19 August 2026 and the mocking rewrite is what breaks
Cloudflare published @cloudflare/vitest-plugin 1.0.0 to npm on 20 August 2026 and called the API unchanged. Outbound request mocking now needs msw 2.14 and a 0.0.1 package with no licence file.
