React 18 brings concurrent renderer, automatic batching

React 18, a major upgrade to the popular JavaScript library, has moved to a release candidate (RC) stage, highlighted by a new concurrent renderer and automatic batching of updates.

Concurrent rendering allows React to prepare multiple versions of the UI at the same time. This mostly behind-the-scenes capability presents possibilities to improve app performance. New APIs were created to support concurrent rendering specific to use cases in areas such as styles, external stores, and accessibility. The developers of React have pledged a gradual adoption strategy for concurrent features. A new root API in React 18 enables the concurrent renderer, letting users opt into concurrent features. The API provides better ergonomics to manage roots.

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