text: import dateRangeArray from "date-range-array";
  
  const a: Array<string> = dateRangeArray("2017-06-01", "2017-06-03");
  //=> ['2017-06-01', '2017-06-02', '2017-06-03']
  
  // $FlowExpectedError
  const c: Array<string> = dateRangeArray("2017-06-01");
  const d: Array<string> = dateRangeArray("2017-06-01", "2017-06-03");
  