export default async function decorate()

in blocks/header/header.js [92:146]
45 lines of code
8 McCabe index (conditional complexity)

export default async function decorate(block) {
  // fetch nav content
  const navMeta = getMetadata('nav');
  const navPath = navMeta ? new URL(navMeta).pathname : '/nav';
  const resp = await fetch(`${navPath}.plain.html`);

  if (resp.ok) {
    const html = await resp.text();

    // decorate nav DOM
    const nav = document.createElement('nav');
    nav.id = 'nav';
    nav.innerHTML = html;

    const classes = ['brand', 'sections'];
    classes.forEach((c, i) => {
      const section = nav.children[i];
      if (section) section.classList.add(`nav-${c}`);
    });

    const navSections = nav.querySelector('.nav-sections');
    if (navSections) {
      navSections.querySelectorAll(':scope > ul > li').forEach((navSection) => {
        if (navSection.querySelector('ul')) navSection.classList.add('nav-drop');
        navSection.addEventListener('click', () => {
          if (isDesktop.matches) {
            const expanded = navSection.getAttribute('aria-expanded') === 'true';
            toggleAllNavSections(navSections);
            navSection.setAttribute('aria-expanded', expanded ? 'false' : 'true');
          }
        });
      });
    }

    // hamburger for mobile
    const hamburger = document.createElement('div');
    hamburger.classList.add('nav-hamburger');
    hamburger.innerHTML = `<button type="button" aria-controls="nav" aria-label="Open navigation">
        <span class="nav-hamburger-icon"></span>
      </button>`;
    hamburger.addEventListener('click', () => toggleMenu(nav, navSections));
    nav.prepend(hamburger);
    nav.setAttribute('aria-expanded', 'false');
    // prevent mobile nav behavior on window resize
    toggleMenu(nav, navSections, isDesktop.matches);
    isDesktop.addEventListener('change', () => toggleMenu(nav, navSections, isDesktop.matches));

    decorateIcons(nav);
    wrapImgsInLinks(nav);
    const navWrapper = document.createElement('div');
    navWrapper.className = 'nav-wrapper';
    navWrapper.append(nav);
    block.append(navWrapper);
  }
}