I'm not sure how many will agree with me on this one, but after using Bootstrap for some time, it's genuinely taken me a while to figure out exactly what the bootstrap.bundle.js file actually contains. In fact, for a long time, I've defaulted to the bootstrap.min.js file and have followed the Getting Started Introduction section found here => https://getbootstrap.com/docs/4.1/getting-started/introduction/#js and have simply used the link to jQuery, and the link to the popper.js.

I decided to see if I can find out more about what the bootstrap.bundle.js file actually is, and found this hidden away in the Contents section (https://getbootstrap.com/docs/4.1/getting-started/contents/#precompiled-bootstrap):

This is the most basic form of Bootstrap: precompiled files for quick drop-in usage in nearly any web project. We provide compiled CSS and JS (bootstrap.), as well as compiled and minified CSS and JS (bootstrap.min.). CSS source maps (bootstrap.*.map) are available for use with certain browsers’ developer tools. Bundled JS files (bootstrap.bundle.js and minified bootstrap.bundle.min.js) include Popper, but not jQuery.

In particular, the last sentence, without any prominence:

Bundled JS files (bootstrap.bundle.js and minified bootstrap.bundle.min.js) include Popper, but not jQuery.

Now, I'm not sure if this is just me, but personally, I think we should state what the bootstrap.bundle.js does on the getting started section: https://getbootstrap.com/docs/4.1/getting-started/introduction/#js

I think it needs to be made a little clearer, and lastly, I'm just wondering whether the term bundle is actually clear enough? For me, I figured it might be: Bootstrap, Popper and jQuery all together, but then found out it doesn't include jQuery.

Whilst it possibly might be a breaking change to change the file name, I think it should be made a little clearer on the getting started section, and actually, wouldn't take too long to implement other than a README.md update? or something similar.