react-native-daterange/src/dates.js

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export const dates = (startDate, endDate, focusedInput) => {
  if (focusedInput === 'startDate') {
    if (startDate && endDate) {
      return { startDate, endDate: null, focusedInput: 'endDate' };
    }
    return { startDate, endDate, focusedInput: 'endDate' };
  }

  if (focusedInput === 'endDate') {
    if (endDate && startDate && endDate.isBefore(startDate)) {
      return { startDate: endDate, endDate: null, focusedInput: 'endDate' };
    }
    return { startDate, endDate, focusedInput: 'startDate' };
  }

  return { startDate, endDate, focusedInput };
};