[build] add stylelint-config-rational-order plugin

packages/slider/index.less

@@ -2,21 +2,21 @@
 
 .van-slider {
   position: relative;
-  border-radius: 999px;
   background-color: @slider-inactive-background-color;
+  border-radius: 999px;
 
   &__bar {
     position: relative;
-    border-radius: inherit;
     background-color: @slider-active-background-color;
+    border-radius: inherit;
   }
 
   &__button {
     width: @slider-button-width;
     height: @slider-button-height;
-    box-shadow: @slider-button-box-shadow;
-    border-radius: @slider-button-border-radius;
     background-color: @slider-button-background-color;
+    border-radius: @slider-button-border-radius;
+    box-shadow: @slider-button-box-shadow;
 
     &-wrapper {
       position: absolute;
@@ -26,12 +26,12 @@
 
       /* use pseudo element to expand touch area */
       &::after {
-        content: '';
         position: absolute;
-        width: 200%;
-        height: 200%;
         top: -50%;
         left: -50%;
+        width: 200%;
+        height: 200%;
+        content: '';
       }
     }
   }
@@ -41,8 +41,8 @@
   }
 
   &--vertical {
-    height: 100%;
     display: inline-block;
+    height: 100%;
 
     .van-slider__button-wrapper {
       top: auto;