Trigger event upon jQuery being loaded
As suggested by @KevinB you can utilize load event of specific <script> element
<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js" defer></script>
<script>
const dojQueryStuff = (el, params) => this.jQuery(el, params).appendTo("body");
</script>
<script>
document
.querySelector("script[src$='3.2.1/jquery.min.js']")
.onload = event => {
console.log(event.target.src);
dojQueryStuff("<div>", {
html: "jQuery version: " + this.jQuery().jquery + " loaded"
});
}
</script>
</head>
<body>
</body>
</html>