React Complier
summary
A compiler transforms React components into a control‑flow/data‑flow graph and applies optimizations like dead code elimination, constant propagation, type inference and alias analysis so only minimal UI parts re-render. It treats setState functions don't change so dependencies get removed, avoiding manual memoization; e.g., a playlist no longer recomputes when the songs array is unchanged. Meta runs this in production since early last year with measurable speedups, delivering fine grained reactivity without changing existing React code.
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