IE detection in TypeScript

is_ie.ts

import * as _ from 'lodash'
import * as Bowser from 'bowser'

isIE(): boolean {
  const browser: Bowser.Parser.Parser = Bowser.getParser(window.navigator.userAgent)

  const result: boolean | undefined = browser.satisfies({
    windows: {
      'internet explorer': '>0'
    }
  })

  return _.isUndefined(result) ? false : result
}