Release Preact X - Virtuous DOM and the Fragments of Suspense · preactjs/preact...

Virtuous DOM and the Fragments of Suspense · preactjs/preact · GitHub

tl;dr: Preact X is the next major version of Preact fully packed with features like Fragments, Hooks, componentDidCatch, Test-Utils, Debug-Warnings, many compatibility fixes and so much more

It's finally happening! After months of hard work we've crossed the finish line and are over the moon with excitement to finally mark Preact X as stable. We'd like to thank everybody who tested it and submitted bug reports.

We originally planned to release a sort-of migration release as version 9 with just the breaking changes from X, but that got canned because many users reported that the upgrade process was easy enough and didn't warrant a long migration period in-between. In fact we got many reports that the upgrade could be done in under an hour, despite some of the breaking changes in X, making the need for a migration release even less desirable.

What's new?

Preact X ships with several major features and we combined them all in a single document on our site. If you're upgrading an existing Preact 8.x project, we got you covered with a detailed upgrade guide.

To give a quick summary of the new features:

• Fragments
• componentDidCatch
• preact/hooks addon
• preact/test-utils addon
• createContext API
• compat moved to core
• Plethora of compatibility fixes
• Many new warnings in preact/debug
• Same 3 kB size as Preact 8

Again, we highly recommend checking out our new site and specifically the what's new section.

Changes since RC 4

Bug Fixes

• Rewrite shouldComponentUpdate handling to take more edge cases into account (#1931, thanks @JoviDeCroock)
• Fix UNSAFE_* lifecycles being overwritten in compat (#1946, thanks @marvinhagemeister)
• Fix PureComponent rerendering when __source changes (#1950, thanks @JoviDeCroock)
• Fix default argument in useState not applied in rare cases (#1948, thanks @JoviDeCroock)
• Change .forceUpdate() to participate in the update queue (#1939, thanks @developit)
• Fix vnode._children should keep their type as array when diffing (#1924, thanks @cristianbote)
• Allow numeric CSS values to be 0 (e.g. opacity) (#1927, thanks @JoviDeCroock)
• Fix unnecessary rerender on equal contexts (#1925, thanks @JoviDeCroock)

Typings

• Add disableRemotePlayback to HTML Attributes (#1955, thanks @JoviDeCroock)
• Add volume to HTML Attributes (#1938, thanks @jessicabyrne)

Maintenance

• Prevent mangling of __source and __self (#1958, thanks @JoviDeCroock)
• Add documentation on how to do releases (#1928, thanks @marvinhagemeister)