What is React Fiber? And how can I try it out today?

react_fiber.md

What is React Fiber? And how can I try it out today?

what?

React Fiber is an ongoing reimplementation of React's core algorithm. It is the culmination of over two years of research by the React team.

• Andrew Clark: What's Next for React — ReactNext 2016
• React Fiber Architecture

why?

The goal of React Fiber is to increase its suitability for areas like animation, layout, and gestures. Its headline feature is incremental rendering: the ability to split rendering work into chunks and spread it out over multiple frames.

Other key features include the ability to pause, abort, or reuse work as new updates come in; the ability to assign priority to different types of updates; and new concurrency primitives.

• 'old' React stack vs Fiber / notes
• new return types with Fiber

some hints on what we could get as new features (mostly marked with unstable_... for now)

• portals / example
• deferredUpdates

how can I try it out today?

1. git clone https://github.com/facebook/react
2. gulp react:extract-errors (i've added an npm script to avoid installing gulp globally)
3. npm run build
4. use react.js / react-dom-fiber.js in the /build folder

examples?

• the 'official' example
• or the modularized / ES2015 version
• infinite scrolling pattern by @threepointone

status?

Fiber isn't completely ready yet http://isfiberreadyyet.com/.
Scheduled for release in 16.0.0 / 17.0.0 ? (see Dan's comment below)

• The React team's Facebook is using Fiber by default. / source
• http://isfiberreadyyet.com/ is using Fiber / source / code

thanks @threepointone for the build steps

Excited on this one!

"Official example" link is broken

There aren’t many articles on this matter, yet this one – Should I be worried about React Fiber? – might be a good starting point on the topic. Read more on what contribution to the system it provides as well as what are the key benefits of React Native contains.

The instructions in the gist no longer work as since April 2017 react no longer uses gulp to build.

That's the reason I've moved to react in the first place, and it was one great decision.

Most of us seem to have same reason for moving to react
I unsderstand the decision of Angular team, but... I don't want to learn a lot of things to do the same thing.

@ReeganExE

I would say, at least one third of the NG community. 👍

Fiber is now in beta, and is ready.

Awesome! I have successfully install fiber and test my isomorphic application... all works fine!

Nice.

Is React Fiber now being referred to as Concurrent Mode?

No, fiber and concurrent mode are 2 different things, Fiber was a reworking of the React internals and was released with React 16

Ah, got it, thanks. Appreciate the followup :) Would be cool if we could 👍 on people's comments in Gist, too!