React Navigation check if previous screen exists

What could be a solution (not sure that it's the best one) would be to spend in the param object the previous screen. With that, if the params exists would mean that a previous screen exists.

For example:

const navigateAction = NavigationActions.navigate({
  routeName: 'Profile',

  params: { previous_screen: 'CURRENT_SCREEN' },

  action: NavigationActions.navigate({ routeName: 'NEXT_SCREEN' }),
});

this.props.navigation.dispatch(navigateAction);

And then in the next screen:

const { navigation } = this.props;
if (navigation.state.params && navigation.state.params.previous_screen) {
  // A previous screen exists
} else {
  // No previous screen
}

There is an easier way:

if(this.props.navigation.isFirstRouteInParent()) {
    //a previous screen does not exist
} else {
    //a previous screen does exist
}