You're gonna need to give me a bit more context - can you describe how you are loading other libraries? Or anything about your setup?

Go it working:
Larvel 10

app.js
`import * as Popper from "popperjs-app";
window.Popper = Popper;
import "bootstrap-app";
import { CountUp } from 'countup.js';

const countUp = new CountUp('jobsCount', 583, { enableScrollSpy: true });
`

package.json
"dependencies": { "bootstrap-app": "npm:bootstrap@^5.3.0-alpha1", "countup": "npm:countup.js@^2.6.0", "popperjs-app": "npm:@popperjs/core@^2.11.6" } }