Return true when detect event response - node.js

Question

I am using puppeteers. I have created a page.on('response') that is listening that is listening for requests.
I have a loop that takes care of scrolling. How can I detect if scrolling raises the 'response' event?
I was thinking of returning a boolean from the event, but how could I capture it?
page.on('response', (response) => {
if (response.url().indexOf('page') >= 0) {
return true;
} else {
return false;
}
});
while(items.length < howMuchItems) {
await page.evaluate((sel) => {
window.scrollBy(0, document.scrollingElement.querySelector(sel).scrollHeight);
}, selectors.CONTAINER_SCROLLED);
// Detect if exists event response
// If doesn´t exist => break loop
items= await page.$$(selectors.ITEM);
}

Answer 1

I dont know your program logic, but generally you must create like this code
const waitForNewItems = () =>
new Promise((resolve, reject) =>
page.once('response', (response) => {
if (response.url().indexOf('page') >= 0) {
return resolve(true);
} else {
return resolve(false);
}
});
while(items.length < howMuchItems) {
await page.evaluate((sel) => {
window.scrollBy(0, document.scrollingElement.querySelector(sel).scrollHeight);
}, selectors.CONTAINER_SCROLLED);
// Detect if exists event response
// If doesn´t exist => break loop
const bool = await waitForNewItems();
if (!bool) break;
items= await page.$$(selectors.ITEM);
}