backupTwitterFollowers.js

let followingURL = [];
let locked = false;
let prevScrollPos;

function onlyUnique(value, index, self) {
  return self.indexOf(value) === index;
}

const running = setInterval(() => {
	if (locked) return;

	locked = true;

	const backwardScroll = document.body.scrollHeight - window.innerHeight;
	const scrollIndex = backwardScroll > 0 ? backwardScroll : 0;

	if ( prevScrollPos === scrollIndex ) {
		clearInterval(running);

		// after it's done

		var uniq = followingURL.filter(onlyUnique);

		var followingStr = uniq.join('\r\n');
		var downloadLink = document.createElement('a');
		downloadLink.setAttribute('href', 'data:text/plain;charset=utf-8,' + encodeURIComponent(followingStr));
		downloadLink.setAttribute('download', "following.txt");
		downloadLink.innerText="download me";
		downloadLink.style.cssText="position: fixed;top: 0;left: 0;background: rgb(0 0 0 / 75%);color: #fff;width: 100%;height: 100%;text-align: center;line-height: 100vh;";
		document.body.appendChild(downloadLink);

	} else {
		prevScrollPos = scrollIndex;
	}

	let following = document.querySelectorAll('[data-testid=cellInnerDiv]');

	following.forEach(item => {
		const userUrl = item.querySelector('a')?.href;
		if ( userUrl ) {
			followingURL.push( userUrl );
		}
	});

	console.log('Scrolled to new position ', scrollIndex);
	window.scrollTo(0, scrollIndex);
	locked = false;
}, 5000);