added more functions

src/domUtils.ts

@@ -0,0 +1,24 @@
+export function addGlobalEventListener(
+    type: string,
+    selector: string,
+    callback: (arg0: Event) => void,
+    options: boolean | AddEventListenerOptions,
+    parent = document
+): void {
+  parent.addEventListener(
+      type,
+      e => {
+        // @ts-ignore
+        if (e.target.matches(selector)) callback(e)
+      },
+      options
+  )
+}
+
+export function qs(selector: string, parent = document): Element {
+  return parent.querySelector(selector)
+}
+
+export function qsa(selector: string, parent = document): Element[] {
+  return [...parent.querySelectorAll(selector)]
+}