How to use the @react-navigation/core.StackActions.pop function in @react-navigation/core

}
    const path = Constants.getVisiblePath()

    // We determine if we're at the root if we're at the root of our navigation hierarchy, which is slightly different if you're logged in or out
    if (path[0].routeName === 'loggedIn') {
      if (path[1].routeName === 'Main') {
        if (path.length === 3) {
          return false
        }
      }
    } else {
      if (path.length === 2) {
        return false
      }
    }
    nav.dispatch(StackActions.pop({}))
    return true
  }

_removeScene = route => {
    this.props.navigation.dispatch(StackActions.pop({ key: route.key }));
  };

if (action.payload.replace) {
        return [StackActions.replace({params, routeName})]
      }

      return [StackActions.push({params, routeName})]
    }
    case RouteTreeGen.switchTab: {
      return [NavigationActions.navigate({routeName: action.payload.tab})]
    }
    case RouteTreeGen.switchLoggedIn: {
      return [NavigationActions.navigate({routeName: action.payload.loggedIn ? 'loggedIn' : 'loggedOut'})]
    }
    case RouteTreeGen.clearModals: {
      const numModals = getNumModals(navigation)
      return numModals ? [StackActions.pop({n: numModals})] : []
    }
    case RouteTreeGen.navigateUp:
      return [NavigationActions.back({key: action.payload.fromKey})]
    case RouteTreeGen.navUpToScreen: {
      const fullPath = Constants._getFullRouteForNavigator(navigation.state)
      const popActions: Array = []
      const isInStack = fullPath.reverse().some(r => {
        if (r.routeName === action.payload.routeName) {
          return true
        }
        popActions.push(StackActions.pop({}))
        return false
      })
      return isInStack ? popActions : []
    }
    case RouteTreeGen.resetStack: {

const isInStack = fullPath.reverse().some(r => {
        if (r.routeName === action.payload.routeName) {
          return true
        }
        popActions.push(StackActions.pop({}))
        return false
      })
      return isInStack ? popActions : []