Facebook scraps React , welcomes successor React Fiber

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Facebook has completely rewritten React, its popular JavaScript library for building user interfaces. The company hasn’t previously talked much about React Fiber, as the project is called, but it has actually been working on it for a while.

The idea behind React Fiber is to take what the company has learned from developing React the first time around and put that into an updated framework that is still fully backwards compatible with existing React-based applications.

React Fiber, Facebook tells me, will become the foundation of any future improvements and feature development of the React framework. The main focus here was to make React as responsive as possible, Facebook engineer — and member of the React core team.

For developers who are already using an older version of Relay, Relay Modern comes with a compatibility API.

React is not the only change, though. Relay, Facebook’s JavaScript framework for building data-driven React applications has also been rewritten. According to a blog post by Facebook’s Lee Byron and Joe Savona, Relay Modern is “a new version of Relay designed from the ground up to be easier to use, more extensible and, most of all, able to improve performance on mobile devices.”

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