Preact 7

Just a small bugfix release - DevTools was throwing an exception if components didn't inherit from Component. Preact supports components not inheriting from Component, so we've fixed the DevTools to match 👍

⚛️ Preact 7.2.0 is now available as a regular release!

npm install --save preact

Bugs Squashed

• Fix IE issues from 7.1 and update test cases (huge thanks to @mkxml for the hard work on this 🙇)
• Fix TextNode duplication in IE (#430, thanks also to @mkxml)
• Fix unnececssary diff when swapping from dangerouslySetInnerHTML to children (thanks @harish2704)
• Fix issue in 7.x with <select> sometimes not applying value prop (#446)
• Don't stringify true children, instead skip them (#468, thanks @jxodwyer)
• Fix issue where unmount could be skipped on a top-level component (#493, discovered by @insin)
• (DevTools Integration) Fix multiple root element issue

New Features

• Use a shared empty Array for props.children when there are no children. Fixes simple shallow equality-based shouldComponentUpdate for leaf nodes 🎉
• Remove instanceof SVGElement check in favor of duck typing. Fixes JSDOM compatibility and improves diff performance (#423, thanks @nhunzaker)
• Better TypeScript Definitions: Component lifecycle methods, setState callback, etc

• 10x performance boost for initial rendering (#416)
• Fix edge case when swapping component root (#414)
• Fix diff reflow when removing leading element (#394)
• Check existence of firstChild before checking if it is a Text node
• Performance optimization for element/tree removal
• Re-add short-circuit for PFC's (fixes compositional PFC triggering constant recycling)
• Fixed TypeScript definition signature for linkState (#427)
• Add a whole bunch of explanatory comments to the diff engine 🎉

Bugfix

This release fixes an issue when hydrating from a static server-rendered DOM that could cause Preact to do far more work than it should have been doing. If you're doing SSR, check out this release for a massive performance boost.

7.x

7.x is currently in beta. It should be an entirely safe upgrade for most.

The reason it's a new major version is because Preact now ignores externally created DOM elements when rendering, unless performing hydration from a server-render (ie - the diff is initiated from a render() against an element that was not created by the DOM renderer).