Refactor videoElement getter into a provider with callback

providers/video-element.js

@@ -0,0 +1,22 @@
+let videoElement = null;
+
+module.exports.ontimeupdate = (cb) => {
+	const observer = new MutationObserver((mutations, observer) => {
+		if (!videoElement) {
+			videoElement = document.querySelector("video");
+			if (videoElement) {
+				observer.disconnect();
+				videoElement.ontimeupdate = () => cb(videoElement);
+			}
+		}
+	});
+
+	if (!videoElement) {
+		observer.observe(document, {
+			childList: true,
+			subtree: true,
+		});
+	} else {
+		videoElement.ontimeupdate = () => cb(videoElement);
+	}
+};