MSW: Mock APIs at the Network Layer
Mock Service Worker intercepts API calls at the network level using a Service Worker, so your app makes real requests. Use it for consistent mocking in development, testing, and Storybook.
Mock Service Worker intercepts API calls at the network layer via a Service Worker, so your app code remains unchanged. This creates a single source of truth for network behavior, reusable across local development, integration tests, and Storybook. The biggest footgun is using it to assert on request details in tests; MSW defines network behavior, so tests should assert on the resulting UI changes, not the implementation detail of the request itself.
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