Jest tests failing with error TypeError _moment.default.localeData is not a function

react-dates version e.g. react-dates@18.3.1

Describe the bug I’ve set up a jest test to render my component that is using a react-dates datepicker, and I’ve imported 'react-dates/initialize', but my test fails with the error:

TypeError: _moment.default.localeData is not a function

Source code (including props configuration) Steps to reproduce the behavior:

<DateRangePicker
  startDate={this.state.startDate}
  startDateId="your_unique_start_date_id"
  endDate={this.state.endDate}
  endDateId="your_unique_end_date_id"
  onDatesChange={({ startDate, endDate }) => this.setState({ startDate, endDate })}
  focusedInput={this.state.focusedInput}
  onFocusChange={focusedInput => this.setState({ focusedInput })}
/>

If you have custom methods that you are passing into a react-dates component, e.g. onDatesChange, onFocusChange, renderMonth, isDayBlocked, etc., please include the source for those as well.

Screenshots/Gifs If applicable, add screenshots or gifs to help explain your problem.

Desktop (please complete the following information):

• OS: [e.g. iOS] Mac OS 10.13.6
• Browser [e.g. chrome, safari] Chrome
• Version [e.g. 22] 72.0.3626.121 (Official Build) (64-bit)

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

Is the issue reproducible in Storybook? The issue is not reproducible in storybook. This only happens in test.

Additional context Add any other context about the problem here.

[YM-KA]

Hi @ljharb ! I managed to get it to work. My mock looked like this:

const moment = require.requireActual('moment')
export default (timestamp = 0) => {
  return moment(timestamp)
}

I changed it into

const moment = require.requireActual('moment')
const myMoment = (timestamp = 0) => {
  return moment(timestamp)
}
Object.assign(myMoment, moment)
export default myMoment

😃

[ljharb]

Closing, but will be happy to reopen if @mkelley33 can reply with clarification.