React Fiber is a core part of React’s internal architecture, and as a developer, you don’t need to implement or directly interact with it. It works behind the scenes and enhances the rendering process automatically.

What does this mean for developers?

• You don’t need to worry about React Fiber explicitly: You can focus on writing your React components, managing state, and handling events, without needing to manage or configure Fiber.

• Automatic improvements: All the benefits of Fiber, like incremental rendering, asynchronous updates, prioritization of updates, and better error handling, are already built into React. You get them “for free” when you use React 16 and later, as Fiber is part of React’s rendering engine.

How does Fiber improve the developer experience?

While you don’t directly work with Fiber, it improves your app’s performance and user experience without you having to think about it:

• React will now automatically prioritize UI updates that are more urgent, such as user interactions, and will handle other tasks like data fetching more efficiently in the background.
• Large lists or complex UIs will be more responsive because Fiber breaks the work into smaller chunks, reducing the chances of UI freezing.
• Features like Suspense (for async rendering) or Concurrent Mode (for handling multiple tasks concurrently) are possible due to React Fiber, but as a developer, you just use them through React’s API without worrying about how Fiber handles things internally.

In summary, Fiber is transparent to you as a developer—it’s a performance enhancement that works automatically and improves how React handles rendering, without you needing to configure or interact with it directly. Y