Temporary repository to reproduce issue with react-router when run in vitest, the root depends on react-router, and another dependency also has a peer dependency on react-router.

In that case, when that dependency imports from react-router, it ends with a different instance than the one resolved for the root project imports.

The project includes two components in the src dir, App and DummyComponent.

• App only creates a BrowserRouter and adds DummyComponent inside of it.
• DummyComponent imports a hook from the @shlinkio/shlink-frontend-kit package, which internally imports useLocation from react-router.

When this is bundled for the web with vite, everything works as expected, but when trying to render DummyComponent in a vitest test, it errors with useLocation() may be used only in the context of a <Router> component, even if the test makes sure to wrap it in a MemoryRouter (or any other kind of router).

The issue is reproducible with node 22.12 or later. It works as expected with older node.js versions.

1. Clone this: git clone git@github.com:acelaya/peer-react-router-vitest.git.
2. Make sure you are using node 22.12 or newer. Instructions can be found here https://nodejs.org/en/download
3. Install dependencies: npm install.
4. Open in the browser: npm run dev. You should be able to open the URL in printed in the console, and see no errors.
5. Run tests with vitest: npm run test. The only existing test should fail with Error: useLocation() may be used only in the context of a <Router> component.