now project is multiplatform and correctly working

src/jsMain/kotlin/dev/inmo/jsuikit/modifiers/UIKitGrid.kt

@@ -0,0 +1,20 @@
+package dev.inmo.jsuikit.modifiers
+
+sealed class UIKitGrid(suffix: String) : UIKitModifier {
+    override val classes: Array<String> = arrayOf("uk-grid-$suffix")
+
+    sealed class Gap(suffix: String) : UIKitGrid(suffix) {
+
+        object Small : Gap("small")
+        object Medium : Gap("medium")
+        object Large : Gap("large")
+        object Collapse : Gap("collapse")
+
+    }
+
+    object Divider : UIKitGrid("divider")
+
+    object MatchHeight : UIKitGrid("match")
+    object ItemMatchHeight : UIKitGrid("item-match")
+
+}