How to use the react-day-picker.LocaleUtils function in react-day-picker

function MyComponent() {
   return 
}
DayPicker2.DateUtils.clone(new Date());

describe('renderCaption', () => {
    const currentYear = new Date().getFullYear()
    const datepicker = shallow()
    const captionProps: Partial = {
      date: new Date(currentYear, 0, 1),
      localeUtils: {
        ...DayPicker.LocaleUtils,
        formatMonthTitle: datepicker.instance().formatMonthTitle,
      },
    }
    it('Should render the given month title', () => {
      const caption = renderer.create(datepicker.instance().renderCaption(captionProps))
      expect(caption).toMatchSnapshot()
    })
    it('Should render the given month title with year if it is not the current year', () => {
      const futureYearProps = { ...captionProps, date: new Date(2050, 0, 1) }
      const caption = renderer.create(datepicker.instance().renderCaption(futureYearProps))
      expect(caption).toMatchSnapshot()
    })
  })

const defaultWeekdaysLong = [0, 1, 2, 3, 4, 5, 6].map(weekday =>
  DayPicker.LocaleUtils.formatWeekdayLong(weekday),
)

const defaultWeekdaysShort = [0, 1, 2, 3, 4, 5, 6].map(weekday =>
  DayPicker.LocaleUtils.formatWeekdayShort(weekday),
)

>
        
      
    )
  }
}

import React from 'react';
import { storiesOf } from '@storybook/react';
import { action } from '@storybook/addon-actions';
import { checkA11y } from 'storybook-addon-a11y';
import Weekday from './index';
import DayPicker from 'react-day-picker';

const localeUtils = DayPicker.LocaleUtils;

storiesOf('InputDateWeekdays', module)
  .addDecorator(checkA11y)
  .add('Short Weekday', () => (
    
  ))
  .add('Medium Weekday', () => (
    
  ))
  .add('Long Weekday', () => (
    
  ));