{
  "version": 3,
  "sources": ["unit_fixed_header.ts"],
  "sourcesContent": ["/*!\n * @license\n * Copyright 2019-2020 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 * Shows a fixed element when a separate element begins to go out of view.\n */\nclass FixedHeaderController {\n  private intersectionObserver: IntersectionObserver;\n\n  /**\n   * @param el The element to observe to determine whether to show the fixed element.\n   * @param fixedEl The element to show when the other begins to go out of view.\n   */\n  constructor(private el: Element, private fixedEl: Element) {\n    if (!el || !fixedEl) {\n      throw new Error('Must provide sentinel and fixed elements to constructor.');\n    }\n\n    this.intersectionObserver = new IntersectionObserver(this.intersectionObserverCallback, {\n      threshold: 1.0,\n    });\n    this.intersectionObserver.observe(this.el);\n\n    // Fixed positioning on Safari iOS is very broken, and without this hack,\n    // focusing on the overflow menu will cause all content to scroll.\n    // The -webkit-overflow-scroll CSS property is only available on mobile\n    // Safari, so check for it and set the appropriate style to fix this.\n    if (\n      // eslint-disable-next-line @typescript-eslint/no-explicit-any\n      (window.getComputedStyle(document.body) as any)['-webkit-overflow-scrolling'] !== undefined\n    ) {\n      [document.documentElement, document.body].forEach(el => {\n        el.style.overflow = 'auto';\n      });\n    }\n  }\n\n  private intersectionObserverCallback: IntersectionObserverCallback = entries => {\n    entries.forEach(entry => {\n      if (entry.isIntersecting) {\n        this.fixedEl.classList.remove('UnitFixedHeader--visible');\n      } else {\n        this.fixedEl.classList.add('UnitFixedHeader--visible');\n      }\n    });\n  };\n}\n\nconst fixedHeaderSentinel = document.querySelector('.js-fixedHeaderSentinel');\nconst fixedHeader = document.querySelector('.js-fixedHeader');\nif (fixedHeaderSentinel && fixedHeader) {\n  new FixedHeaderController(fixedHeaderSentinel, fixedHeader);\n}\n\nconst overflowSelect = document.querySelector<HTMLSelectElement>('.js-overflowSelect');\nif (overflowSelect) {\n  overflowSelect.addEventListener('change', e => {\n    window.location.href = (e.target as HTMLSelectElement).value;\n  });\n}\n"],
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