No mock libraries imported in production code

Packages like msw, nock, and fetch-mock intercept network traffic at the module level. If one is imported from a production route or shared client, every outbound call from that path hits the mock instead of the real backend — so payments, auth, and analytics silently no-op while returning fake success responses. The defect typically ships because AI scaffolding imports these libraries into source files while prototyping, and the import is never removed before deploy.

Move every mock-library import into files under tests/ or __tests__/ and delete the import from production source. Verify your bundler output with next build or webpack --profile to confirm none of the listed packages appear. Example correction:

// tests/handlers.ts — mocks live here, never in src/
import { rest } from 'msw'