Can you link me to how you know that? The docs seem to indicate it doesn't:
"Since StyleX depends on ahead-of-time compilation, it is important for all your styles to be statically analyzable"
"No runtime style injection."
"All styles are bundled in a static CSS file at compile-time."
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By dynamic styles I assume we're talking about something like this:
{
backgroundColor: props.thirdPartyColor ?? randomColor()
}