function updateActiveLink()

in beta/src/components/Layout/useTocHighlight.tsx [31:54]

• 19 lines of code
• 5 McCabe index (conditional complexity)

    function updateActiveLink() {
      const pageHeight = document.body.scrollHeight;
      const scrollPosition = window.scrollY + window.innerHeight;
      const headersAnchors = getHeaderAnchors();

      if (scrollPosition >= 0 && pageHeight - scrollPosition <= TOP_OFFSET) {
        // Scrolled to bottom of page.
        setCurrentIndex(headersAnchors.length - 1);
        return;
      }

      let index = -1;
      while (index < headersAnchors.length - 1) {
        const headerAnchor = headersAnchors[index + 1];
        const {top} = headerAnchor.getBoundingClientRect();

        if (top >= TOP_OFFSET) {
          break;
        }
        index += 1;
      }

      setCurrentIndex(Math.max(index, 0));
    }