// Likely want to requier both polyfills..
require('matchmedia-polyfill');
require('matchmedia-polyfill/matchMedia.addListener');

if (matchMedia('tv').matches) {
  // tv media type supported
}

if (matchMedia('only screen and (max-width: 480px)').matches) {
  // smartphone/iphone... maybe run some small-screen related dom scripting?
}

if (matchMedia('all and (orientation:landscape)').matches) {
  // probably tablet in widescreen view
}