Handlers or SetupServer()

[charlestbell]

Which one should I use? Handlers or SetupWorker()? It is not clear in the docs.

The docs mention both Handlers
and SetupServer() with no explanation or comparison between them. Which do I use in which situation?

I'm building a react-native app.

[kettanaito]

Hi, @charlestbell. Sorry about the confusion.

Handlers (or "request handlers") are functions that describe what requests to capture and how to mock their responses. Think of it as a network behavior description. Handlers do not do any interception/mocking on their own, they are but a set of instructions on what to do when a matching request happens.

APIs like setupServer and setupWorker enable interception of requests. Calling them is what makes MSW aware of the requests that happen in your application. As you've seen from the Getting started tutorial, you provide request handlers to one of those APIs (or both!) depending on the environment you wish to enable mocks in.

As you're building a React Native application, you'll be using setupServer (React Native is still Node.js).