navigation.navigate() not enforcing params in TypeScript

Current Behavior

I've followed the guide here to set up type checking, but navigation.navigate() isn't enforcing that the params are passed to the screen.

// rootStackNavigator.tsx

export type RootStackParamList = {
  Login: undefined;
  Leads: undefined;
  WebView: { url: string };
};

...

// screens/Login/index.ts

interface Props {
  navigation: StackNavigationProp<RootStackParamList, 'Login'>;
}

class Login extends Component<Props> {
  ...
}

Calling navigation.navigate('WebView') in the above component does not error.

Expected Behavior

navigation.navigate('WebView') should error if the param { url: 'something' } is not passed.

Typing for the navigate method:

navigate<RouteName extends keyof ParamList>(...args: ParamList[RouteName] extends undefined | any ? [RouteName] | [RouteName, ParamList[RouteName]] : [RouteName, ParamList[RouteName]]): void;

The ParamList[RouteName] extends undefined | any conditional check in the typing is obviously returning true and the type that is being enforced on the call is:

navigate<"WebView">(...args: ["WebView"] | ["WebView", {
    url: string;
}]): void

I would expect the resulting type to be:

navigate<"WebView">(...args: ["WebView", {
    url: string;
}]): void

Your Environment

Start with the navigate method typing shown in the issue and reproduce it using the RootStackParamList from rootStackNavigator.tsx and the Login example in screens/Login/index.ts. Verify how the conditional check handles WebView's { url: string } params. Done means navigation.navigate('WebView') is rejected unless the required url object is supplied.