8811c1f3f6
The error `next-router-not-mounted` can also happen when one tries to use the `next/router` hook inside the app directory. The error page has been updated to reflect that, and migration guides are linked. Closes #47038.
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NextRouter was not mounted
Why This Error Occurred
A component used useRouter outside a Next.js application, or was rendered outside a Next.js application. This can happen when doing unit testing on components that use the useRouter hook as they are not configured with Next.js' contexts.
This can also happen when you try to use the useRouter hook from next/router inside the app directory, as the App Router's useRouter from next/navigation has different behavior to the useRouter hook in pages.
Possible Ways to Fix It
If used in a test, mock out the router by mocking the next/router's useRouter() hook.
If used in the app directory, migrate to the new hooks imported from next/navigation.