feat: add new file

frontend/node_modules/dom-helpers/cjs/contains.d.ts

@@ -0,0 +1,7 @@
+/**
+ * Checks if an element contains another given element.
+ *
+ * @param context the context element
+ * @param node the element to check
+ */
+export default function contains(context: Element, node: Element): boolean | undefined;