The GOAT JavaScript library jQuery has gone 4.0 coinciding with, from what I hear, was a lovely reunion party. It’s not wildly different, but it’s gone full ESM and dropped a bunch of old stuff. Minified and gzipped it’s 27.6 kB. Version 3.7.1, the last before this release, was 30.5 kB — so it’s nice […]

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jQuery 4.0 has been released with full ESM support and removal of legacy features. The minified and gzipped version is now 27.6 kB (down from 30.5 kB in version 3.7.1), with a slim build at 19.6 kB. While beneficial for existing jQuery applications that can upgrade, it's generally not recommended for new projects since vanilla JavaScript now provides most of jQuery's functionality natively.

jQuery 4 – Frontend Masters Blog

Also worth mentioning, it introduces breaking changes. With that being said, please be careful.

Why do you need jQuery when you have:
<ul>
<li><a href="https://github.com/ded/qwery" target="_blank" rel="noopener nofollow">https://github.com/ded/qwery</a></li>
<li><a href="https://github.com/ded/bonzo" target="_blank" rel="noopener nofollow">https://github.com/ded/bonzo</a></li>
<li><a href="https://github.com/tubalmartin/ondomready" target="_blank" rel="noopener nofollow">https://github.com/tubalmartin/ondomready</a></li>
</ul>
More micro JS libraries to wonder about:
<ul>
<li><a href="http://microjs.com/#" target="_blank" rel="noopener nofollow">http://microjs.com/</a></li>
</ul>