// Root.js - part of my code
  <Provider {...stores}>
            <MainStack
              ref={ref => {
                if (ref) {
                  AppStore.setMainNavigationRef(ref)
                  // this.navigation_ref = ref._navigation
                }
              }}
            />
          </Provider>


// AppStore (I'm using with mobx)
@action setMainNavigationRef(main_navigation_ref) {
    this.main_navigation_ref = main_navigation_ref
    console.log('setMainNavigationRef', main_navigation_ref)

  }

  resetMainStack(routeName, params) {
    this.main_navigation_ref.dispatch(
      StackActions.reset({
        index: 0,
        actions: [
          NavigationActions.navigate({
            routeName,
            params,
          }),
        ],
      })
    );
  }
}


// UserProfile (child of tabStack)

resetStack = () => {
    this.props.AppStore.resetMainStack('Auth', null)
  }