Type of route name, route params in React Navigation Typescript

Question

I am using ReactNavigation v6 along with typescript

I have created a helper functions as

export function navigate(routeName, routeParams) {
  navigationRef.current?.navigate(routeName, routeParams);
}

What type should I specify for routeName & routeParams such that it type checks these params correctly?

I have the following types for my StackNavigator

export type StackNavigator = {
  Welcome: undefined;
  Username: undefined;
  Password: undefined;
  ForgotPassword: {id: number};
};

Answer 1

The routeName parameter can be typed using the following type

type Routes = keyof StackNavigator

But the routeParams will be dynamic. i.e. routeParams will change as per routeName

It can be

{id: number} or undefined

So to compute the 2nd parameter on basis of value of 1st parameter we can do the following

type NavigationArgs = {
  [Route in keyof StackNavigator]: [
    routeName: Route,
    routeParams?: StackNavigator[Route],
  ];
}[keyof StackNavigator];

export function navigate(...args: NavigationArgs) {
  const [routeName, routeParams] = args;
  navigationRef.current?.navigate(routeName, routeParams);
}

This will ensure strict type checking