Initial version

themes/zen/assets/sass/mixins/rtl/_rtl.scss

@@ -0,0 +1,26 @@
+// stylelint-disable scss/at-if-closing-brace-newline-after, scss/at-if-closing-brace-space-after
+
+$include-rtl: true !default;
+
+// rtl()
+//
+// Includes Right-To-Left language support by adding a selector of
+// `[dir="rtl"]`.
+//
+// Can be turned off globally by setting `$include-rtl: false;`.
+//
+// $selector = ':dir(rtl)' - The RTL selector.
+@mixin rtl($selector: ':dir(rtl)') {
+  @if $include-rtl {
+    @if & {
+      &#{$selector} {
+        @content;
+      }
+    }
+    @else {
+      #{$selector} {
+        @content;
+      }
+    }
+  }
+}