Ionic 4.0.0 首个 RC 版 4.0.0-rc.0 发布了，该版本的更新内容不多，主要是 bug 修复和引入新特性。
Bug Fixes
action-sheet: set 100% height to fix scrollable options (#16789) (e3d7282)
all: ts 3.2 issues (f393a82)
angular: Fix cordova browser error when resumed (#16810) (e735d2c)
angular: fix sibling router-outlets (#16774) (35e3848), closes #16411
angular: router-outlet memory leak (2c41823), closes #16285
body: body background matches ion-content (0699884)
core: export ionic lifecycle names (77640c9), closes #16760
core: ts lint issue (#16814) (fb38002)
list: adjust label margin to align with spec for md (#16751) (60ef98d), closes #16643
modal: --box-shadow (e2ee0b6), closes #16798
progress-bar: looking nice inside toolbar (b5efede)
pwa: use 100% of the viewport (4c4bdf2)
tab-bar: adds selected color if tab bar is using a color (#16766) (54e5a24), closes #16761
virtual-scroll: fixes dynamic changes (d1cecf1)
Features
angular: expose animationDirection (#16802) (320eb03)
angular: tabs.select() (56dd8ae), closes #16753
Performance Improvements
angular: detach fromn change detection (f613b3b)

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