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MagNav {\n    constructor($content, $headings) {\n        if (!$content || !$headings) {\n            throw new Error('MagNav requires parameters');\n        }\n\n        this.options = {\n            bar: 'magnet-bar',\n            item: 'magnet-item',\n            active: 'magnet-item-active',\n            top: 'magnet-top',\n            fixed: 'magnet-bar-fixed'\n        };\n\n        this.navItemCount = 0;\n\n        this.$content = $content;\n        this.$headings = $headings;\n        this.$navList = document.createElement('ul');\n        this.$top = document.createElement('div');\n        this.$top.id = this.options.top;\n        this.$backToTopLinks = [];\n\n        this.$navList.classList.add(this.options.bar);\n\n        this.$headings.forEach($heading => {\n            const id = `magnet-${this.navItemCount++}`,\n                $navListItem = document.createElement('li'),\n                $navLink = document.createElement('a'),\n                $backToTopContainer = document.createElement('div'),\n                $backToTopLink = document.createElement('a');\n\n            $backToTopLink.textContent = 'back to top';\n            $backToTopLink.href = `#${this.options.top}`;\n            $backToTopContainer.classList.add(this.options.top);\n            $backToTopContainer.appendChild($backToTopLink);\n            $heading.parentElement.appendChild($backToTopContainer);\n\n            this.$backToTopLinks.push($backToTopContainer);\n\n            $navLink.href = `#${id}`;\n            $navLink.textContent = $heading.textContent;\n            $navListItem.classList.add(this.options.item);\n\n            $navListItem.appendChild($navLink);\n            this.$navList.appendChild($navListItem);\n\n            $heading.id = id;\n\n            $navLink.addEventListener('click', event => {\n                event.preventDefault();\n                const $destination = document.getElementById(event.target.getAttribute('href').substring(1));\n\n                if ($destination && $destination.scrollIntoView) {\n                    $destination.scrollIntoView({block: 'start', behavior: 'smooth'});\n                }\n\n                [...this.$navList.querySelectorAll(`.${this.options.active}`)].forEach($active =>\n                    $active.classList.remove(this.options.active)\n                );\n\n                event.target.classList.add(this.options.active);\n            });\n        });\n\n        document.body.insertBefore(this.$top, document.body.firstElementChild);\n        this.$content.insertAdjacentElement('beforebegin', this.$navList);\n\n        this.top = this.$navList.getBoundingClientRect().top + window.scrollY;\n\n        this.handleScroll = () => {\n            requestAnimationFrame(() => {\n                if (window.scrollY >= this.top) {\n                    if (!this.$navList.classList.contains(this.options.fixed)) {\n                        this.$navList.classList.add(this.options.fixed);\n                    }\n\n                    return;\n                }\n\n                if (this.$navList.classList.contains(this.options.fixed)) {\n                    this.$navList.classList.remove(this.options.fixed);\n                }\n            });\n        };\n\n        window.addEventListener('scroll', this.handleScroll);\n    }\n\n    destroy() {\n        this.$headings.forEach($heading => {\n            $heading.removeAttribute('id');\n        });\n        this.$backToTopLinks.forEach($link => $link.parentElement.removeChild($link));\n        this.$navList.parentElement.removeChild(this.$navList);\n        this.$top.parentElement.removeChild(this.$top);\n        window.removeEventListener('scroll', this.handleScroll);\n    }\n}\n\nexport default MagNav;\n"],"names":["MagNav","$content","$headings","_this","_classCallCheck","Error","this","options","bar","item","active","top","fixed","navItemCount","$navList","document","createElement","$top","id","$backToTopLinks","classList","add","forEach","$heading","concat","$navListItem","$navLink","$backToTopContainer","$backToTopLink","textContent","href","appendChild","parentElement","push","addEventListener","event","preventDefault","$destination","getElementById","target","getAttribute","substring","scrollIntoView","block","behavior","querySelectorAll","$active","remove","body","insertBefore","firstElementChild","insertAdjacentElement","getBoundingClientRect","window","scrollY","handleScroll","requestAnimationFrame","contains","key","value","removeAttribute","$link","removeChild","removeEventListener"],"sourceRoot":""}