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React Fiber by Glenn Reyes • @glnnrys

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" React Zurich!

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React Fiber

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What is React Fiber?

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• Complete rewrite of React core algorithm • Same Public API • Still being tested at Facebook internally • Release with v16 (pretty soon)

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isfiberreadyyet.com Is Fiber Ready Yet?

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Why Fiber?

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Fiber resolves long-standing problems

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React Fiber

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Scheduling

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Prioritizing

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ReactPriorityLevel { NoWork: 0, // No work is pending. SynchronousPriority: 1, // For controlled text inputs. TaskPriority: 2, // Completes at the end of the current tick. AnimationPriority: 3, // Needs to complete before the next frame. HighPriority: 4, // Interaction that needs to complete soon LowPriority: 5, // Data fetching, or result from updating stores. OffscreenPriority: 6, // Won't be visible };

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Pause, abort & reuse work

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requestAnimationFrame(cb) requestIdleCallback(cb)

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Fiber

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Fiber

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Stack

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• Error boundaries • No PropTypes in prod builds • Render multiple elements

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const Foo = () => ([ foo, bar, ]);

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How to use Fiber now?

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Wait until there is an officially release!

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yarn add react@next react-dom@next npm install —-save react@next react-dom@next // index.js import ReactDOM from ‘react-dom’; // default DOM

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yarn add react@next react-dom@next npm install —-save react@next react-dom@next // index.js import ReactDOMFiber from ‘react-dom/lib/ReactDOMFiber';

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yarn add react@next react-dom@next npm install —-save react@next react-dom@next // index.js import ReactDOMFiber from ‘react-dom/lib/ReactDOMFiber'; Don’t do this!!!

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UMD build git clone https://github.com/facebook/react.git yarn yarn run build → /build/react-dom-fiber.min.js

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facebook.com/groups/ reactfiberbeta

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www.beta.facebook.com

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How can I prove if it is React Fiber or Stack?

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How to 1. Join https://facebook.com/groups/reactfiberbeta 2. Visit https://www.beta.facebook.com

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Useful resouces • Things: github.com/koba04/react-fiber-resources • Beta: facebook.com/groups/reactfiberbeta • Chat: https://m.me/g/Abas8IcWxIvjVxHN • Tests: isfiberreadyyet.com • News: Follow GH issues & PRs (using “fiber” filter)

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Thank you! @glnnrys