Echo JS 0.11.0

That's my concern as well.. FWIW, you can dynamically set the content in most UI frameworks for the raw SVG content, which can use CSS properties for attribute usage beyond a single color... so you could use var(--brand-color) and match against body.dark or body.light for adjusting an accent color as well.

Assuming your light/dark integration changes the html or body element as appropriate, most will/do just that.  I will generally detect for localStorage falling back to native preference, then set the html element appropriately as well as integration with my UI toolkit as such.  I do similar for handling various side-menu states combined with breakpoint integrations.