Node 15 features npm 7, experimental QUIC support. This version is based on v8 8.6 adding the following new features:
The React 17 release is unusual because it doesn’t add any new developer-facing features. Instead, this release is primarily focused on making it easier to upgrade React itself.
This release focuses a lot on developer experience, enabling gradual upgrades. This version makes it safer to embed a tree managed by one version of React inside a tree managed by a different version of React.