Function onStart

src/index.tsx:312–336

(evt: Event)

    }

    const onStart = (evt: Event) => {
      // Only allow pull-to-refresh when the scroll container is at the very top.
      // Replaces the old lastScrollTop ref which was never updated after removing
      // the scroll event listener, making the original guard permanently a no-op.
      const scrollTop =
        scrollEl instanceof HTMLElement
          ? scrollEl.scrollTop
          : document.documentElement.scrollTop;
      if (scrollTop > 0) return;

      draggingRef.current = true;

      if (evt instanceof MouseEvent) {
        startYRef.current = evt.pageY;
      } else if (evt instanceof TouchEvent) {
        startYRef.current = evt.touches[0].pageY;
      }
      currentYRef.current = startYRef.current;

      if (infScrollRef.current) {
        infScrollRef.current.style.willChange = 'transform';
        infScrollRef.current.style.transition =
          'transform 0.2s cubic-bezier(0,0,0.31,1)';
      }
    };

    const onMove = (evt: Event) => {
      if (!draggingRef.current) return;