{
  "version": 3,
  "sources": ["index.ts"],
  "sourcesContent": ["/**\n * @license\n * Copyright 2022 The Go Authors. All rights reserved.\n * Use of this source code is governed by a BSD-style\n * license that can be found in the LICENSE file.\n */\n\n/**\n * Left Navigation.\n */\nexport const initJumpLinks = async function () {\n  const pagesWithJumpLinks = ['/about'];\n  if (!pagesWithJumpLinks.includes(window.location.pathname)) {\n    // stop the file from doing anything else if the page doesn't have jumplinks\n    return;\n  }\n\n  // these might be generated or not so don't grab references to the elements until actually need them.\n  const titles = 'h2, h3, h4';\n  const nav = '.LeftNav a';\n  // these are always in the dom so we can get them now and throw errors if they're not.\n  const leftNav = document.querySelector('.LeftNav');\n  const siteContent = document.querySelector('.go-Content');\n  let isObserverDisabled = false;\n\n  /**\n   * El function\n   * @example el('h1', {className: 'title'}, 'Welcome to the site');\n   * @example el('ul', {className: 'list'}, el('li', {}, 'Item one'), el('li', {}, 'Item two'), el('li', {}, 'Item three'));\n   * @example el('img', {src: '/url.svg'});\n   */\n  function el(\n    type = '',\n    props: { [key: string]: string } = {},\n    ...children: (HTMLElement | HTMLElement[] | string | undefined)[]\n  ) {\n    // Error, no type declared.\n    if (!type) {\n      throw new Error('Provide `type` to create document element.');\n    }\n\n    // Create element with optional attribute props\n    const docEl = Object.assign(document.createElement(type), props);\n\n    // Children: array containing strings or elements\n    children.forEach(child => {\n      if (typeof child === 'string') {\n        docEl.appendChild(document.createTextNode(child));\n      } else if (Array.isArray(child)) {\n        child.forEach(c => docEl.appendChild(c));\n      } else if (child instanceof HTMLElement) {\n        docEl.appendChild(child);\n      }\n    });\n\n    return docEl;\n  }\n  /**  Build Nav if data hydrate is present. */\n  function buildNav() {\n    return new Promise((resolve, reject) => {\n      let navItems: { id: string; label: string; subnav?: { id: string; label: string }[] }[] = [];\n      let elements: HTMLElement[] = [];\n\n      if (!siteContent || !leftNav) {\n        return reject('.SiteContent not found.');\n      }\n      if (leftNav instanceof HTMLElement && !leftNav?.dataset?.hydrate) {\n        return resolve(true);\n      }\n\n      for (const title of siteContent.querySelectorAll(titles)) {\n        if (title instanceof HTMLElement && !title?.dataset?.ignore) {\n          switch (title.tagName) {\n            case 'H2':\n              navItems = [\n                ...navItems,\n                {\n                  id: title.id,\n                  label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                },\n              ];\n              break;\n\n            case 'H3':\n            case 'H4':\n              if (!navItems[navItems.length - 1]?.subnav) {\n                navItems[navItems.length - 1].subnav = [\n                  {\n                    id: title.id,\n                    label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                  },\n                ];\n              } else if (navItems[navItems.length - 1].subnav) {\n                navItems[navItems.length - 1].subnav?.push({\n                  id: title.id,\n                  label: title?.dataset?.title ? title.dataset.title : title.textContent ?? '',\n                });\n              }\n              break;\n          }\n        }\n      }\n\n      for (const navItem of navItems) {\n        const link = el('a', { href: '#' + navItem.id }, el('span', {}, navItem.label));\n        elements = [...elements, link];\n        if (navItem?.subnav) {\n          let subLinks: HTMLElement[] = [];\n          for (const subnavItem of navItem.subnav) {\n            const subItem = el(\n              'li',\n              {},\n              el(\n                'a',\n                { href: '#' + subnavItem.id },\n                el('img', { src: '/static/frontend/about/dot.svg', width: '5', height: '5' }),\n                el('span', {}, subnavItem.label)\n              )\n            );\n            subLinks = [...subLinks, subItem];\n          }\n          const list = el('ul', { className: 'LeftSubnav' }, subLinks);\n          elements = [...elements, list];\n        }\n      }\n\n      elements.forEach(element => leftNav.appendChild(element));\n\n      return resolve(true);\n    });\n  }\n  /**\n   * Set the correct active element.\n   */\n  function setNav() {\n    return new Promise(resolve => {\n      if (!document.querySelectorAll(nav)) return resolve(true);\n      for (const a of document.querySelectorAll(nav)) {\n        if (a instanceof HTMLAnchorElement && a.href === location.href) {\n          setElementActive(a);\n          break;\n        }\n      }\n      resolve(true);\n    });\n  }\n  /** resetNav: removes all .active from nav elements */\n  function resetNav() {\n    return new Promise(resolve => {\n      if (!document.querySelectorAll(nav)) return resolve(true);\n      for (const a of document.querySelectorAll(nav)) {\n        a.classList.remove('active');\n      }\n      resolve(true);\n    });\n  }\n  /** setElementActive: controls resetting nav and highlighting the appropriate nav items */\n  function setElementActive(element: HTMLAnchorElement) {\n    if (element instanceof HTMLAnchorElement) {\n      resetNav().then(() => {\n        element.classList.add('active');\n        const parent = element?.parentNode?.parentNode;\n        if (parent instanceof HTMLElement && parent?.classList?.contains('LeftSubnav')) {\n          parent.previousElementSibling?.classList.add('active');\n        }\n      });\n    }\n  }\n  /** setLinkManually: disables observer and selects the clicked nav item. */\n  function setLinkManually() {\n    delayObserver();\n    const link = document.querySelector('[href=\"' + location.hash + '\"]');\n    if (link instanceof HTMLAnchorElement) {\n      setElementActive(link);\n    }\n  }\n  /** delayObserver: Quick on off switch for intersection observer. */\n  function delayObserver() {\n    isObserverDisabled = true;\n    setTimeout(() => {\n      isObserverDisabled = false;\n    }, 200);\n  }\n  /** observeSections: kicks off observation of titles as well as manual clicks with hashchange */\n  function observeSections() {\n    window.addEventListener('hashchange', setLinkManually);\n\n    if (siteContent?.querySelectorAll(titles)) {\n      const callback: IntersectionObserverCallback = entries => {\n        if (!isObserverDisabled && Array.isArray(entries) && entries.length > 0) {\n          for (const entry of entries) {\n            if (entry.isIntersecting && entry.target instanceof HTMLElement) {\n              const { id } = entry.target;\n              const link = document.querySelector('[href=\"#' + id + '\"]');\n              if (link instanceof HTMLAnchorElement) {\n                setElementActive(link);\n              }\n              break;\n            }\n          }\n        }\n      };\n      // rootMargin is important when multiple sections are in the observable area **on page load**.\n      // they will still be highlighted on scroll because of the root margin.\n      const ob = new IntersectionObserver(callback, {\n        threshold: 0,\n        rootMargin: '0px 0px -50% 0px',\n      });\n      for (const title of siteContent.querySelectorAll(titles)) {\n        if (title instanceof HTMLElement && !title?.dataset?.ignore) {\n          ob.observe(title);\n        }\n      }\n    }\n  }\n\n  try {\n    await buildNav();\n    await setNav();\n    if (location.hash) {\n      delayObserver();\n    }\n    observeSections();\n  } catch (e) {\n    if (e instanceof Error) {\n      console.error(e.message);\n    } else {\n      console.error(e);\n    }\n  }\n};\n"],
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}