v4.9.0

Jan 22, 2020

Big thanks to the 43 contributors who made this release possible.

Here are some highlights ✨:

• 🐛 Change the outlined input notch implementation to rely 100% on CSS (#17680) @eps1lon.
• 🔍 11 patches on the Autocomplete component.
• 📚 Simplify the usage of "copy demo" action (#19291) @theswerd.
• 📚 Warn when defaultValue changes (#19070) @m4theushw.
• 💅 Slight updates to better match the Material Design spec (#19277, #19342) @elmeerr.

@material-ui/core@v4.9.0

• [Breadcrumbs] Remove private separator component (#19234) @hiteshkundal
• [ButtonBase] Fix potential memory leak for multi-touch devices (#19333) @eps1lon
• [DialogContentText] Fix component prop (#19102) @fyodore82
• [l10n] Add Bulgarian (pg-BG) locale (#19138) @panayotoff
• [l10n] Improve it-IT locale (#19143) @keul
• [RadioGroup] Fix useRadioGroup.d.ts (#19001) @NMinhNguyen
• [Slider] Add a custom scale support (#19158) @netochaves
• [Slider] Center the value label (#19330) @LorenzHenk
• [StepButton] Fix prop-types warning regarding expanded (#19332) @eps1lon
• [Stepper] Add support for expanding all the steps (#19200) @hiteshkundal
• [Tab] Remove font-size media-query (#19342) @elmeerr
• [TableRow] Improve hover/selected styles (#19277) @elmeerr
• [TextField] Fix outline offscreen label strikethrough (#17680) @eps1lon
• [TextField] Improve transitions (#19228) @oliviertassinari
• [TextField] Support padding for helperText (#19198) @hiteshkundal
• [Tooltip] Fix popper.js re-instantiation (#19304) @netochaves

@material-ui/styles@v4.8.0

• [styles] Overload function signature instead of conditional (#19320) @eps1lon

@material-ui/types@v5.0.0

Breaking change

• [types] Overload function signature instead of conditional (#19320) @eps1lon
  Or, And, IsAny and IsEmptyInterface have been removed.
• [types] Remove CoerceEmptyInterface (#19259) @eps1lon

@material-ui/lab@v4.0.0-alpha.40

• [Alert] Improve Transition demo (#19283) @theswerd
• [Alert] Use alert severity in demos (#19123) @sviande
• [Rating] Add default value prop (#19103) @oliviertassinari
• [Skeleton] Use span element (#19278) @oliviertassinari
• [Autocomplete] Add missing 'clear' to onInputChange typing (#19286) @mvestergaard
• [Autocomplete] Decrease padding when icon buttons aren't rendered (#19257) @jedwards1211
• [Autocomplete] Document how to disable chrome autofill (#19126) @goleary
• [Autocomplete] Don't delete tag if exists (in freesolo mode) (#19215) @adica
• [Autocomplete] Extend support to textarea (#19232) @justtol
• [Autocomplete] Fix group labels hiding items during keybd navigation (#19305) @aisamu
• [Autocomplete] Fix misleading warning (#19177) @embeddedt
• [Autocomplete] Fix option grouping (#19121) @liangchunn
• [Autocomplete] Improve typings (#18854) @testarossaaaaa
• [Autocomplete] Polish CustomizedHook demo (#19287) @JeremiAnastaziak
• [Autocomplete] Add selectOnFocus prop (#19281) @Bebersohl

Docs

• [blog] December 2019 Update (#19119) @oliviertassinari
• [docs] Add "material-ui-confirm" to the related projects (#19237) @jonatanklosko
• [docs] Add a new site to showcase (hifivework) (#19129) @lau-sam
• [docs] Add a new site to showcase (tradenba) (#19307) @zachrdz
• [docs] Add links to mui-treasury (#19334) @siriwatknp
• [docs] Fix "Edit this page" link (#19170) @neletdev
• [docs] Fix a tiny mistake in Chips playground (#19172) @OrBin
• [docs] Fix broken TypeScript hash link in CONTRIBUTING.md (#19236) @hiteshkundal
• [docs] Fix link in switches.md (#19256) @TurnerB24
• [docs] Fix typo in the accessible table demo (#19321) @carbonid1
• [docs] Improve EnhancedTable.tsx demo (#19266) @sdgluck
• [docs] Improve draggable dialog demo (#19339) @konekoya
• [docs] Improve the demos copy experience (#19291) @theswerd
• [docs] Improve the documentation of the dark theme (#19122) @m4theushw
• [docs] Improve transition documentation (#19201) @hiteshkundal
• [docs] Improve typography documentation (#19216) @kevin-lindsay-1
• [docs] Merge brand.png and logo.png @oliviertassinari
• [docs] Minor typo (#19219) @sourabhbagrecha
• [docs] Minor typo fix in testing docs (#19146) @Ardeshir81
• [docs] Remove Glamor link (#19178) @terryBaz
• [docs] Update the translations (#19111) @mbrookes
• [docs] Use button in backdrop demo (#19282) @theswerd
• [docs] Use reasonable unitless line-height for Box (#19260) @minikomi

Core

• [test] Improve visual regression tests (#19175) @oliviertassinari
• [core] Batch small changes (#19097) @oliviertassinari
• [core] Batch small changes (#19174) @oliviertassinari
• [core] Distinguish JSSProperties and CSSProperties (#19263) @eps1lon
• [core] Fix TypographyStyle not allowing media queries and allowing unsafe undefined access (#19269) @eps1lon
• [core] Ignore a few flaky visual tests (#19226) @oliviertassinari
• [core] Remove unecessary exports from styles/transitions.js (#19337) @JonKrone
• [core] Simplify types of styled (#19243) @eps1lon
• [core] Use node 10 in every CI/CD pipeline (#19301) @eps1lon
• [core] Warn when defaultValue changes (#19070) @m4theushw
• [build] Clarify transform-runtime, runtime version (#18512) @eps1lon