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Returns a new object.\n    * @private\n    * @param {Boolean}  deep     If true, do a deep (or recursive) merge [optional]\n    * @param {Object}   objects  The objects to merge together\n    * @returns {Object}          Merged values of defaults and options\n    */\n    const extend = function ()  {\n\n        let extended = {};\n        let deep = false;\n        let i = 0;\n        let length = arguments.length;\n\n        /* Check if a deep merge */\n        if (Object.prototype.toString.call(arguments[0]) === \"[object Boolean]\") {\n            deep = arguments[0];\n            i++;\n        }\n\n        /* Merge the object into the extended object */\n        let merge = function (obj) {\n            for (let prop in obj) {\n                if (Object.prototype.hasOwnProperty.call(obj, prop)) {\n                    /* If deep merge and property is an object, merge properties */\n                    if (deep && Object.prototype.toString.call(obj[prop]) === \"[object Object]\") {\n                        extended[prop] = extend(true, extended[prop], obj[prop]);\n                    } else {\n                        extended[prop] = obj[prop];\n                    }\n                }\n            }\n        };\n\n        /* Loop through each object and conduct a merge */\n        for (; i < length; i++) {\n            let obj = arguments[i];\n            merge(obj);\n        }\n\n        return extended;\n    };\n\n    function LazyLoad(images, options) {\n        this.settings = extend(defaults, options || {});\n        this.images = images || document.querySelectorAll(this.settings.selector);\n        this.observer = null;\n        this.init();\n    }\n\n    LazyLoad.prototype = {\n        init: function() {\n\n            /* Without observers load everything and bail out early. */\n            if (!root.IntersectionObserver) {\n                this.loadImages();\n                return;\n            }\n\n            let self = this;\n            let observerConfig = {\n                root: this.settings.root,\n                rootMargin: this.settings.rootMargin,\n                threshold: [this.settings.threshold]\n            };\n\n            this.observer = new IntersectionObserver(function(entries) {\n                Array.prototype.forEach.call(entries, function (entry) {\n                    if (entry.isIntersecting) {\n                        self.observer.unobserve(entry.target);\n                        let src = entry.target.getAttribute(self.settings.src);\n                        let srcset = entry.target.getAttribute(self.settings.srcset);\n                        if (\"img\" === entry.target.tagName.toLowerCase()) {\n                            if (src) {\n                                entry.target.src = src;\n                            }\n                            if (srcset) {\n                                entry.target.srcset = srcset;\n                            }\n                        } else {\n                            entry.target.style.backgroundImage = \"url(\" + src + \")\";\n                        }\n                    }\n                });\n            }, observerConfig);\n\n            Array.prototype.forEach.call(this.images, function (image) {\n                self.observer.observe(image);\n            });\n        },\n\n        loadAndDestroy: function () {\n            if (!this.settings) { return; }\n            this.loadImages();\n            this.destroy();\n        },\n\n        loadImages: function () {\n            if (!this.settings) { return; }\n\n            let self = this;\n            Array.prototype.forEach.call(this.images, function (image) {\n                let src = image.getAttribute(self.settings.src);\n                let srcset = image.getAttribute(self.settings.srcset);\n                if (\"img\" === image.tagName.toLowerCase()) {\n                    if (src) {\n                        image.src = src;\n                    }\n                    if (srcset) {\n                        image.srcset = srcset;\n                    }\n                } else {\n                    image.style.backgroundImage = \"url('\" + src + \"')\";\n                }\n            });\n        },\n\n        destroy: function () {\n            if (!this.settings) { return; }\n            this.observer.disconnect();\n            this.settings = null;\n        }\n    };\n\n    root.lazyload = function(images, options) {\n        return new LazyLoad(images, options);\n    };\n\n    if (root.jQuery) {\n        const $ = root.jQuery;\n        $.fn.lazyload = function (options) {\n            options = options || {};\n            options.attribute = options.attribute || \"data-src\";\n            new LazyLoad($.makeArray(this), options);\n            return this;\n        };\n    }\n\n    return LazyLoad;\n});\n"],"sourceRoot":""}