let supported: boolean;
let prefix: string;

if (typeof document !== 'undefined' && document.createElement) {
  const d = document.createElement('div');

  for (let i in d.style) {
    if (d.style.hasOwnProperty(i)) {
      let m = i.match(/^(moz|webkit|ms|)(transition|animation)$/i);
      if (m) {
        supported = true;
      }
      if (m && m[1]) {
        // согласно спецификации, префиксы к событиям должны быть в нижнем регистре
        // https://www.w3schools.com/jsref/event_transitionend.asp
        prefix = m[1].toLowerCase();
      }
    }
  }
}

const transitionEndEventName: string = prefix ? prefix + 'TransitionEnd' : 'transitionend';
const animationEndEventName: string = prefix ? prefix + 'AnimationEnd' : 'animationend';

export default {
  supported,
  prefix,
  transitionEndEventName,
  animationEndEventName,
};