问题：
10 rules skipped due to selector errors:
:host-context([dir=rtl]) .ion-float-start -> subselects_1.subselects[name] is not a function
:host-context([dir=rtl]) .ion-float-end -> subselects_1.subselects[name] is not a function
:host-context([dir=rtl]) .ion-float-sm-start -> subselects_1.subselects[name] is not a function
:host-context([dir=rtl]) .ion-float-sm-end -> subselects_1.subselects[name] is not a function
:host-context([dir=rtl]) .ion-float-md-start -> subselects_1.subselects[name] is not a function
:host-context([dir=rtl]) .ion-float-md-end -> subselects_1.subselects[name] is not a function
:host-context([dir=rtl]) .ion-float-lg-start -> subselects_1.subselects[name] is not a function
:host-context([dir=rtl]) .ion-float-lg-end -> subselects_1.subselects[name] is not a function
:host-context([dir=rtl]) .ion-float-xl-start -> subselects_1.subselects[name] is not a function
:host-context([dir=rtl]) .ion-float-xl-end -> subselects_1.subselects[name] is not a function
参考：
https://github.com/ionic-team/ionic-cli/issues/4774#issuecomment-1315278594
解决：
如果不需要 @import "~@ionic/angular/css/float-elements.css";
可以注释掉，这样不会报错了。否则可以不用管
