React 17, the latest version of the JavaScript UI library from Facebook, has arrived. The new release, designed to serve as a stepping stone, lacks any new developer-facing features but instead focuses on making upgrades easier.

Unveiled October 20, React 17 enables gradual React upgrades. When moving from React 15 to React 16 or from React 16 to React 17, users usually would upgrade the entire app at once. While this works well for many apps, it can be challenging if the codebase was written more than a few years ago and was not actively maintained.

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