Beike Product & Technology

Dec 10, 2021 · Frontend Development

Understanding React 16 Architecture: Scheduler, Reconciler, Renderer, Fiber, and the Render & Commit Phases

This article explains React 16's three‑layer architecture—Scheduler, Reconciler, and Renderer—introduces fiber nodes and trees, and details how the render and commit phases process updates using beginWork, completeWork, effect lists, and three‑step DOM mutation.