MSW 3

MSW 3.0 shipped on 2026-09-28. What you remember is most likely MSW 2, and several v2 patterns no longer compile or behave differently. Check the installed version first:

node -p "require('./node_modules/msw/package.json').version"

If it is 3.x, follow this file. When unsure about an API, read the types in node_modules/msw/lib/**/*.d.ts instead of guessing.

The v2 habits that break in v3