How to catch the page change event in the document while scrolling it inside the viewer?

Which product are you using?
PDF.js Express Plus

PDF.js Express Version

Detailed description of issue
I need to get the page number from a page change event when I scroll through the document. Is there an in built function to do that? I just need to need to get the page number when page is scrolled/changed.

Thank you!

Expected behaviour
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Link to document
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Code snippet
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You can use the ‘pageNumberUpdated’ event like so:

instance.Core.documentViewer.addEventListener('pageNumberUpdated', (pageNumber) => {