Msw/2/Upgrade Recipe


Made for



Last update

May 28, 2024

This recipe is a set of codemods that will upgrade your project from using msw v1 to v2.

The recipe includes the following codemods:


This recipe does not change the signatures of MSW handlers, if they were called using a custom factory function, for example to provide more type-safety or else. For example, the following code will only be partially updated:

export function mockFactory<T extends MyComplexType>(
url: string,
resolver: MyResolverType,
) {
return rest.get(url, resolver);
const handlers = [
mockFactory('/some/url', (req, res, ctx) => {
return res(ctx.status(200));

Also, if you were using req.body in your interceptors, this codemod will blindly assume you want await request.json() instead of any other type. You will have to correct that manually.

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