Tipo de animación js

<script src="https://cdn.jsdelivr.net/npm/[email protected]"></script>
<script>
var typed = new Typed('#type_text', {
    strings: ["PLAY", "WATCH", "DOWNLOAD"],
    startDelay: 900,
    backSpeed: 70,
    typeSpeed: 50,
    loop: true,
});
</script>
Undefined