Function easeScrollTop

src/hold-stream.ts:63–76

(
  el: HTMLElement,
  targetTop: number,
  factor = DEFAULT_STREAM_SCROLL_EASE,
)

 * Use inside a requestAnimationFrame loop while content streams.
 */
export function easeScrollTop(
  el: HTMLElement,
  targetTop: number,
  factor = DEFAULT_STREAM_SCROLL_EASE,
): boolean {
  const target = Math.max(0, targetTop);
  const delta = target - el.scrollTop;
  if (Math.abs(delta) < 0.5) {
    el.scrollTop = target;
    return true;
  }
  el.scrollTop += delta * factor;
  return false;
}

/** Ease a scroll container toward its bottom edge */
export function easeScrollToBottom(