```js

// @run-at document-start

Object.defineProperty(window, "$", {
get: () => {
return (selector) => {
const node = window._$(selector);
if (node && selector instanceof Document) {
node.ready = (callback) => {
console.log("$ has been replaced");
if (typeof callback == "function") {
callback();
}
};
}
return node;
};
},
set: (fn) => {
window._$ = fn;
},
});

```