How to run function after script load

Question

I have code:

let script = document.createElement("script");
script.src = "https://example.com/script.js";
document.head.append(script);
loadStuff();

How do I run loadStuff after loading script?

user_10463854 · Answer

Answering my own very old question:

let script = document.createElement("script");
script.src = "https://example.com/script.js";
script.onload = loadStuff;
document.head.append(script);