Jest failing since defaultViewTransition in v1.117! Help!

[sirPixieJerry]

We updated from @tanstack/react-router v1.114 to 1.121 recently and suddenly all jest tests fail with the following error:

ReferenceError: Response is not defined
at Module.isRedirect() (xxx/node_modules/@tanstack/router-core/src/redirect.ts:96:25)
at isRedirect (xxx/node_modules/@tanstack/router-core/src/router.ts:1894:15)
at processTicksAndRejections (node:internal/process/task_queues:95:5)

Node.js v20.18.0
/xxx/node_modules/@tanstack/router-core/dist/cjs/redirect.cjs:27
  return obj instanceof Response && !!obj.options;

As you can see we use node >=18 and the Response class should be available natively.

Anyway, I discovered that the tests fail with the changes introduced to v1.117 and the introduction of defaultViewTransition.

We use a custom render function that extends the render function of @testing-library/react with a TestProvider for @tanstack/react-router.

Even when I set defaultViewTransition to false the same error occurs. A log in the tests confirm that jest uses node v20.18.0. The test environment in the jest.config is set to testEnvironment: 'jest-environment-jsdom'.

When I install @tanstack/react-router v1.120 the error disappears but I need to wrap all my tests into a waitFor to turn green. I discovered that when I put logs before and after the waitFor the dom is first empty and then fills up with the component to be rendered, although defaultViewTransition is set to false.

I actually spend two full working days on this now and have no clue what is going on. We found a workaround for now and just create a Provider from the routerContext directly:

const routerContext = getRouterContext();

<routerContext.Provider value={router}>{children}</routerContext.Provider>

But this shouldn't be a solution. Does anyone have a clue or ran into the same problem?

EDIT:

To install and import the whatwg-fetch package to the jest.setup solved the Response issue, but still we need a waitFor in each test because the dom doesn't hydrate with the tested component immediately.