May 5, 2019

A big thanks to the 19 contributors who made this release possible!

Here are some highlights ✨:

• 🐛 Many bug fixes based on people migrating from v3 to v4.
• 💄 Responsive font sizes (#14573) @n-batalha.
• 💄 AppBar scroll behavior (#15522) @cvanem.
• ♿️ Better Button and Tooltip keyboard behavior (#15398, #15484) @eps1lon.
• And many more 🔍 TypeScript fixes and 📚 documentation improvements.

@material-ui/core@v4.0.0-beta.1

Bug fixes / Breaking changes

• [ListItem][expansionpanel] Follow the style convention (#15534) @oliviertassinari Fix a CSS override issue.
• [Tooltip] Display only on keyboard focus (#15398) @eps1lon Fix an accessibility issue.

Changes

• [AppBar] Hide and Elevate on Scroll (#15522) @cvanem
• [Box] Add to core index TypeScript definitions (#15576) @ljvanschie
• [ButtonBase] Use fork of focus-visible polyfill (#15484) @eps1lon
• [Menu] Add 'variant' prop TypeScript declaration (#15556) @kunimart
• [MenuList] Ignore disableListWrap for text focus navigation (#15555) @ryancogswell
• [Portal] Migrate to React hooks (#15399) @gautam-pahuja
• [TableCell] Fix TypeScript declaration of the 'padding' prop (#15516) @kunimart
• [TableCell] Update TypeScript definitions (#15541) @ljvanschie
• [TablePagination] Use OverridableComponent in TypeScript declarations (#15517) @kunimart
• [Tabs] Fix aria-label issue on the demos (#15507) @amangalvedhekar
• [theme] Responsive font sizes (#14573) @n-batalha
• [Transition] Fix false-positive ref warning (#15526) @eps1lon
• [Badge] Handle undefined badgeContent rendering empty bubble (#15581) @Naismith

@material-ui/styles@v4.0.0-beta.1

• [styles] Create a new JSS instance with injectFirst (#15560) @oliviertassinari
• [core] Set default theme type for makeStyles (#15549) @merceyz
• [core] Set default theme type for useTheme (#15538) @merceyz

@material-ui/types@v4.0.0-beta.2

• [types] Add @material-ui/types package (#15577) @eps1lon

@material-ui/system@v4.0.0-beta.1

• [system] Test types (#15575) @eps1lon

@material-ui/lab@v4.0.0-alpha.10

• [Slider] Save focus after click (#15439) @jztang

Docs

• [example] Fix TypeScript compilation error (#15550) @emmtqg
• [docs] Add DelayingApperance TypeScript demo (#15551) @merceyz
• [docs] Convert react-autosuggest demo to TypeScript (#15485) @nareshbhatia
• [docs] Document v4 theme.spacing.unit deprecation (#15571) @cvanem
• [docs] Extract inherited component from test (#15562) @eps1lon
• [docs] Fix Draggable Dialog interactions with the content (#15552) @devdanco
• [docs] Fix outdated links & demos (#15521) @oliviertassinari
• [docs] Fix typechecking (#15501) @merceyz
• [docs] Fix typography demo in dark mode (#15591) @jztang
• [docs] Improve v3 migration guide (#15527) @janhesters
• [docs] Migrate more demos to hooks (#15494) @merceyz
• [docs] Remove NoSsr where possible (#15510) @oliviertassinari
• [docs] Simplify wording for customization demo descriptions (#15539) @mbrookes
• [docs] Update Changelog (#15567) @oliviertassinari
• [docs] Updated v3 Migration guide (#15518) @vkasraj

Core

• [core] Add additional warnings when attaching ref to function elements (#15519) @eps1lon
• [core] Add ref prop to transition components (#15520) @eps1lon
• [core] Better handle theme.overrides pseudo-classes (#15578) @oliviertassinari
• [core] Fix createStyles not being defined (#15547) @pvdstel