Why do I get "Mismatched anonymous define()" on my Magento store?

This is a RequireJS error specific to Magento. It happens when a UMD library (GSAP, Swiper, Lenis, ScrollTrigger) is loaded with a plain <script src> tag. Because Magento runs RequireJS, the library registers itself as an anonymous AMD module, never attaches to window, and your animations or sliders silently die. The fix is to load it correctly, either via a RequireJS shim/config, or by fetching it as text and injecting it with define temporarily nulled, then restored. We have hit this exact bug on real Magento and Hyvä builds.