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whippy-edition/app/javascript/mastodon/scroll.js

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JavaScript
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const easingOutQuint = (x, t, b, c, d) => c * ((t = t / d - 1) * t * t * t * t + 1) + b;
const scrollTop = (node) => {
const startTime = Date.now();
const offset = node.scrollTop;
const targetY = -offset;
const duration = 1000;
let interrupt = false;
const step = () => {
const elapsed = Date.now() - startTime;
const percentage = elapsed / duration;
if (percentage > 1 || interrupt) {
return;
}
node.scrollTop = easingOutQuint(0, elapsed, offset, targetY, duration);
requestAnimationFrame(step);
};
step();
return () => {
interrupt = true;
};
};
export default scrollTop;