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8:22Better Stack
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Replacing an entire design system in an existing project is prone to errors. Layouts often break, and functionality can become tangled. By using the StyleX engine, which Meta developed while managing over 13,000 apps over 8 years, you can safely coexist with existing CSS-in-JS.
Separate namespaces to ensure styles do not mix.
Using this isolation structure can save 40% of development time compared to a full refactor.
If you do not align Figma design tokens with Asterix theme settings, visual discrepancies will persist. Instead of developers fixing code manually, resolve this with a JSON-based pipeline.
Once this process is complete, developers will use token variables like var(--spacing-3) instead of hardcoding. UI fragmentation disappears, and the use of autocomplete reduces errors.
To increase the speed of new page development, you must reduce repetitive business logic and UI assembly. For complex modules, separate the rendering area from the state management logic.
By doing this, you can save 2 hours of component creation time for every page you build.
Injecting styles at runtime degrades performance as the number of components increases. StyleX extracts atomic CSS at build time to reduce bundle size. According to data from the Meta development team, after adopting static compilation, style bundle sizes decreased by 80%, and rendering efficiency improved by 30%.
Switching to a static build allows you to provide a stable UI without runtime overhead, even in large-scale services.