Added new utils method getRootStatementOfNode

src/node/NodeUtils.ts

@@ -93,6 +93,28 @@ export class NodeUtils {
         return NodeUtils.getSiblingStatementByOffset(statement, -1);
     }
 
+    /**
+     * @param {Node} node
+     * @returns {Statement}
+     */
+    public static getRootStatementOfNode (node: ESTree.Node): ESTree.Statement {
+        if (NodeGuards.isProgramNode(node)) {
+            throw new Error('Unable to find root statement for `Program` node');
+        }
+
+        const parentNode: ESTree.Node | undefined = node.parentNode;
+
+        if (!parentNode) {
+            throw new ReferenceError('`parentNode` property of given node is `undefined`');
+        }
+
+        if (!NodeGuards.isNodeHasScope(parentNode)) {
+            return NodeUtils.getRootStatementOfNode(parentNode);
+        }
+
+        return <ESTree.Statement>node;
+    }
+
     /**
      * @param {NodeGuards} node
      * @returns {TNodeWithScope}