message: IE11 lacks Number.isNaN. Use lodash instead.
diff: +import * as _ from 'lodash-es';
  +
  // Behaves like moment.js's fromNow
  export const fromNow = (dateTime, now=undefined) => {
  if (!now) {
  @@ -80,4 +82,4 @@ export const fromNow = (dateTime, now=undefined) => {
  return `${-Math.round(daysAgo / 365)} years from now`;
  };
  -export const isValid = (dateTime: Date) => dateTime instanceof Date && !Number.isNaN(dateTime.valueOf());
  +export const isValid = (dateTime: Date) => dateTime instanceof Date && !_.isNaN(dateTime.valueOf());
  