text: import toInt from '../utils/to-int';
  import {Duration} from './constructor';
  import {createDuration} from './create';
  
  var ordering = ['year', 'quarter', 'month', 'week', 'day', 'hour', 'minute', 'second', 'millisecond'];
  
  export default function isDurationValid(m) {
      for (var key in m) {
          if (!(ordering.indexOf(key) !== -1 && (m[key] == null || !isNaN(m[key])))) {
              return false;
          }
      }
  
      var unitHasDecimal = false;
      for (var i = 0; i < ordering.length; ++i) {
          if (m[ordering[i]]) {
              if (unitHasDecimal) {
                  return false; // only allow non-integers for smallest unit
              }
              if (parseFloat(m[ordering[i]]) !== toInt(m[ordering[i]])) {
                  unitHasDecimal = true;
              }
          }
      }
  
      return true;
  }
  
  export function isValid() {
      return this._isValid;
  }
  
  export function createInvalid() {
      return createDuration(NaN);
  }
  