diff --git a/web-view-components-compiler/src/main/java/groowt/view/component/web/ast/NodeUtil.java b/web-view-components-compiler/src/main/java/groowt/view/component/web/ast/NodeUtil.java
deleted file mode 100644
index 71936f4..0000000
--- a/web-view-components-compiler/src/main/java/groowt/view/component/web/ast/NodeUtil.java
+++ /dev/null
@@ -1,72 +0,0 @@
-package groowt.view.component.web.ast;
-
-import groowt.view.component.web.antlr.TokenList;
-import groowt.view.component.web.ast.extension.NodeExtension;
-import groowt.view.component.web.ast.node.LeafNode;
-import groowt.view.component.web.ast.node.Node;
-import groowt.view.component.web.ast.node.TreeNode;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.List;
-import java.util.Objects;
-
-public final class NodeUtil {
-
-    public static boolean isAnyOfType(Node subject, Class<?>... nodeTypes) {
-        Objects.requireNonNull(subject);
-        for (final var type : nodeTypes) {
-            if (type.isAssignableFrom(subject.getClass())) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    @SuppressWarnings("unchecked")
-    public static boolean hasExtensionOfType(Node subject, Class<?>... extensionTypes) {
-        Objects.requireNonNull(subject);
-        for (final var extensionType : extensionTypes) {
-            if (subject.hasExtension((Class<? extends NodeExtension>) extensionType)) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    public static boolean isAnyOfType(Node subject, List<Class<? extends Node>> nodeTypes) {
-        Objects.requireNonNull(subject);
-        for (final var type : nodeTypes) {
-            if (type.isAssignableFrom(subject.getClass())) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    public static @Nullable LeafNode getDeepestLeftmostLeafNode(Node node) {
-        return switch (node) {
-            case LeafNode leafNode -> leafNode;
-            case TreeNode treeNode when treeNode.getChildrenSize() > 0 ->
-                    getDeepestLeftmostLeafNode(treeNode.getAt(0));
-            default -> null;
-        };
-    }
-
-    private static void doFormatAst(Node node, StringBuilder sb, int indentTimes, String indent, TokenList tokenList) {
-        NodeUtilKt.formatSingleNode(node, sb, indentTimes, indent, tokenList);
-        if (node instanceof TreeNode treeNode) {
-            treeNode.getChildren().forEach(child -> doFormatAst(
-                    child, sb, indentTimes + 1, indent, tokenList
-            ));
-        }
-    }
-
-    public static String formatAst(Node node, TokenList tokenList) {
-        final var sb = new StringBuilder();
-        doFormatAst(node, sb, 0, "  ", tokenList);
-        return sb.toString();
-    }
-
-    private NodeUtil() {}
-
-}
diff --git a/web-view-components-compiler/src/main/java/groowt/view/component/web/ast/NodeUtil.kt b/web-view-components-compiler/src/main/java/groowt/view/component/web/ast/NodeUtil.kt
index fe947ab..db4f6b8 100644
--- a/web-view-components-compiler/src/main/java/groowt/view/component/web/ast/NodeUtil.kt
+++ b/web-view-components-compiler/src/main/java/groowt/view/component/web/ast/NodeUtil.kt
@@ -1,11 +1,45 @@
+@file:JvmName("NodeUtil")
 package groowt.view.component.web.ast
 
 import groowt.view.component.web.antlr.TokenList
 import groowt.view.component.web.antlr.formatToken
 import groowt.view.component.web.ast.node.LeafNode
 import groowt.view.component.web.ast.node.Node
+import groowt.view.component.web.ast.node.TreeNode
 
-fun formatSingleNode(node: Node, sb: StringBuilder, indentTimes: Int, indent: String, tokenList: TokenList) {
+fun getDeepestLeftmost(node: Node): LeafNode? {
+    return when (node) {
+        is LeafNode -> node
+        is TreeNode -> {
+            if (node.children.isNotEmpty()) {
+                getDeepestLeftmost(node.children.first())
+            } else {
+                null
+            }
+        }
+    }
+}
+
+fun formatAst(node: Node, tokenList: TokenList): String {
+    val sb = StringBuilder()
+    formatAst(node, tokenList, sb, indentTimes = 0, indent = "  ")
+    return sb.toString()
+}
+
+fun formatAst(
+    node: Node,
+    tokenList: TokenList,
+    sb: StringBuilder,
+    indentTimes: Int = 0,
+    indent: String = "  ",
+) {
+    formatSingleNode(node, sb, indentTimes, indent, tokenList)
+    if (node is TreeNode) {
+        node.children.forEach { formatAst(it, tokenList, sb, indentTimes + 1, indent) }
+    }
+}
+
+private fun formatSingleNode(node: Node, sb: StringBuilder, indentTimes: Int, indent: String, tokenList: TokenList) {
     sb.append(indent.repeat(indentTimes))
     sb.append(
         "${node.javaClass.simpleName}(${node.tokenRange.startPosition.toStringShort()}.."