tl;dr: This release contains a good number of bug fixes and we encourage all users to upgrade.

A little bit of time has passed since our last release and we're excited to ship another one, making Preact even more robust! The fixes nearly touch all packages and further improves compatibility with third-party libraries 🎉

If you glance at the contributor names, you'll notice a few new ones there. It's safe to say that we were amazed and super ecstatic by the amount of new first time contributors to Preact! 🙌

Features

• Include support for customised built-in elements (#2266, thanks @defx)
• Upgrade devtools adapter to support Profiler and bring back preact/devtools import (#2246, thanks @marvinhagemeister)

Bug Fixes

• Suspended components should rerender through shouldComponentUpdate (#2125, thanks @andrewiggins)
• Reduce reads of dom.nextSibling (#2294, thanks @andrewiggins)
• Preserve state when using placeholders (#2295, thanks @andrewiggins)
• Fix Children.map not flattening result (#2287, thanks @marvinhagemeister)
• Fix error when setting size to an invalid value (#2285, thanks @marvinhagemeister)
• Fix wrong SVG attribute for clipPathUnits (#2251, thanks @friebe)
• Fix both class and className being enumerable (#2280, thanks @marvinhagemeister)
• Fix className patch not applied to props (#2279, thanks @marvinhagemeister)
• Bailout when hook throws an error (#2193, thanks @JoviDeCroock)
• Avoid removing existing dom nodes on subsequent replaceNode calls (#2274, thanks @JoviDeCroock)
• Fix shouldComponentUpdate getting called on setState after forceUpdate (#2258, thanks @laino)
• Remove process.env.NODE_ENV check from preact/debug which broke browsers (#2257, thanks @marvinhagemeister)

Types

• Allow null as an initial value for useRef (#2281, thanks @armujahid)

Maintenance

• Rename _lastDomChildSibling to _nextDom (#2297, thanks @andrewiggins)
• Improve code coverage (#2299, thanks @andrewiggins)
• Update mangle.json with Suspense prop rename (#2298, thanks @andrewiggins)
• Fix SVG polygon test failing on IE 11 (#2288, thanks @marvinhagemeister)
• Try out new node submodule exports (#2283, thanks @JoviDeCroock)
• Add section about reporting bugs (#2278, thanks @marvinhagemeister)
• Improve CONTRIBUTINIG + comments (#2277, thanks @marvinhagemeister)
• Add size action (#2270, thanks @developit)
• Prevent postinstall from running on installation (#2271, thanks @JoviDeCroock)
• Add test coverage for createElement (#2273, thanks @zubhav)
• Fix custom element tests failing in IE (#2272, thanks @marvinhagemeister)
• Fix failing IE test (#2267, thanks @marvinhagemeister)
• Add info for first time contributors (#2265, thanks @marvinhagemeister)
• Add unit tests to check proper component unmounting (#2195, thanks @timon-witt)
• Add npm ci to speed up travis (#2255, thanks @JoviDeCroock)
• Add package-lock.json (#2254, thanks @JoviDeCroock)