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4fe72e3ce7
Currently, if we don't have matching routes for a path, we'll reuse the path name for the route name. This doesn't produce an error, and renders the initial route in the navigator. However, the user doesn't have a way of handling this with the default configuration.
This PR adds support for a wildcard pattern ('*'). The wildcard pattern will be matched after all other patterns were matched and will always match unmatched screens. This allows the user to implement a 404 screen.
Example:
```js
{
Home: '',
Profile: 'user/:id',
404: '*',
}
```
This config will return the `404` route for paths which didn't match `Home` or `Profile`, e.g. - `/test`
Closes #8019
Co-authored-by: Evan Bacon <baconbrix@gmail.com>