Best way to read PPTX with javascript

I have been doing some research and I am trying to understand what is the standard way to read a pptx with JavaScript/Typescript in the browser.

A lot of the libraries I have found are mainly for node like textract . I found one library called JS-PPTX but the last commit was made in 2016 so that's not super promising.

Most of the libraries are about creating a Power Point presentation, but what I really need to do is be able to read the file and identify the contents of the slides.

I am happy to read the raw file format and try to parse it if that is better, but I just need a way to upload and read the file with the FileReader Api.

Or if there is a way to convert the pptx to another format that is easier to read I would be into that. One library I found called PPTX2HTML, but this last commit is from 2017.

I found this Stack Overflow post, but it is from 2010 so I am hoping there is an evolution of thought.