Big update for developers 🥳 Meta has open-sourced its styling system called StyleX, the same system that powers Instagram, Facebook, WhatsApp, Threads, and other Meta products. This gives you a fast, scalable, type-safe way to write styles with zero runtime cost, automatic dead-code elimination, and a clean developer experience that feels like CSS but works like a highly optimized build tool. If Meta trusts this setup for apps used by billions, you already know it’s built for real performance :