To run it locally in Webflow, run yarn dev, add this script to the custom code section of Webflow, and redeploy the page:
<script type="module" src="http://localhost:3000/@vite/client"></script>
<script type="module" src="http://localhost:3000/src/main.js"></script>
When you're done, build the project using yarn build, add a txt extension to the js generated, upload it to webflow and add a new script to the custom code section like so:
<script
type="text/javascript"
src="https://uploads-ssl.webflow.com/649c36de625a16ebb7e23a94/651f0ec3197d02cd09ea4301_main.js.txt"
></script>