breakpointSwitch.ts

const mobileQuery = window.matchMedia("(max-width: 74.999em)") // Change to your needs

const handleMobileChange = (mediaQueryList: MediaQueryListEvent | MediaQueryList) => {
  if (mediaQueryList.matches) {
      // Its Mobile
  } else {
      // Its Desktop
  }
}

mobileQuery.addEventListener("change", handleMobileChange)
handleMobileChange(mobileQuery) // Init