I tried with the lib you mentioned, looks fine
I put an HTML element to load the lib and add a div that will get the typing animation
<script src="https://unpkg.com/typewriter-effect@latest/dist/core.js"></script>
<div id="typewriterText">Hey</div>
Then I added the code from the documentation on mounted (but can be triggered by a button or another event), a little bit tweaked for WeWeb
const Typewriter = wwLib.getFrontWindow().Typewriter
const element = document.getElementById('typewriterText');
const typewriter = new Typewriter(element, {
loop: true,
delay: 75,
});
typewriter
.pauseFor(2500)
.typeString('A simple yet powerful native javascript')
.pauseFor(300)
.deleteChars(10)
.typeString('<strong>JS</strong> plugin for a cool typewriter effect and ')
.typeString('<strong>only <span style="color: #27ae60;">5kb</span> Gzipped!</strong>')
.pauseFor(1000)
.start();