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{\n    if (protoProps) defineProperties(Constructor.prototype, protoProps);\n    if (staticProps) defineProperties(Constructor, staticProps);\n    return Constructor;\n  };\n}();\n\nvar _extends = Object.assign || function (target) {\n  for (var i = 1; i < arguments.length; i++) {\n    var source = arguments[i];\n\n    for (var key in source) {\n      if (Object.prototype.hasOwnProperty.call(source, key)) {\n        target[key] = source[key];\n      }\n    }\n  }\n\n  return target;\n};\n\nvar inherits = function (subClass, superClass) {\n  if (typeof superClass !== \"function\" && superClass !== null) {\n    throw new TypeError(\"Super expression must either be null or a function, not \" + typeof superClass);\n  }\n\n  subClass.prototype = Object.create(superClass && superClass.prototype, {\n    constructor: {\n      value: subClass,\n      enumerable: false,\n      writable: true,\n      configurable: true\n    }\n  });\n  if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;\n};\n\nvar objectWithoutProperties = function (obj, keys) {\n  var target = {};\n\n  for (var i in obj) {\n    if (keys.indexOf(i) >= 0) continue;\n    if (!Object.prototype.hasOwnProperty.call(obj, i)) continue;\n    target[i] = obj[i];\n  }\n\n  return target;\n};\n\nvar possibleConstructorReturn = function (self, call) {\n  if (!self) {\n    throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\");\n  }\n\n  return call && (typeof call === \"object\" || typeof call === \"function\") ? call : self;\n};\n\nvar encodeSpecialCharacters = function encodeSpecialCharacters(str) {\n    var encode = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;\n\n    if (encode === false) {\n        return String(str);\n    }\n\n    return String(str).replace(/&/g, \"&amp;\").replace(/</g, \"&lt;\").replace(/>/g, \"&gt;\").replace(/\"/g, \"&quot;\").replace(/'/g, \"&#x27;\");\n};\n\nvar getTitleFromPropsList = function getTitleFromPropsList(propsList) {\n    var innermostTitle = getInnermostProperty(propsList, TAG_NAMES.TITLE);\n    var innermostTemplate = getInnermostProperty(propsList, HELMET_PROPS.TITLE_TEMPLATE);\n\n    if (innermostTemplate && innermostTitle) {\n        // use function arg to avoid need to escape $ characters\n        return innermostTemplate.replace(/%s/g, function () {\n            return Array.isArray(innermostTitle) ? innermostTitle.join(\"\") : innermostTitle;\n        });\n    }\n\n    var innermostDefaultTitle = getInnermostProperty(propsList, HELMET_PROPS.DEFAULT_TITLE);\n\n    return innermostTitle || innermostDefaultTitle || undefined;\n};\n\nvar getOnChangeClientState = function getOnChangeClientState(propsList) {\n    return getInnermostProperty(propsList, HELMET_PROPS.ON_CHANGE_CLIENT_STATE) || function () {};\n};\n\nvar getAttributesFromPropsList = function getAttributesFromPropsList(tagType, propsList) {\n    return propsList.filter(function (props) {\n        return typeof props[tagType] !== \"undefined\";\n    }).map(function (props) {\n        return props[tagType];\n    }).reduce(function (tagAttrs, current) {\n        return _extends({}, tagAttrs, current);\n    }, {});\n};\n\nvar getBaseTagFromPropsList = function getBaseTagFromPropsList(primaryAttributes, propsList) {\n    return propsList.filter(function (props) {\n        return typeof props[TAG_NAMES.BASE] !== \"undefined\";\n    }).map(function (props) {\n        return props[TAG_NAMES.BASE];\n    }).reverse().reduce(function (innermostBaseTag, tag) {\n        if (!innermostBaseTag.length) {\n            var keys = Object.keys(tag);\n\n            for (var i = 0; i < keys.length; i++) {\n                var attributeKey = keys[i];\n                var lowerCaseAttributeKey = attributeKey.toLowerCase();\n\n                if (primaryAttributes.indexOf(lowerCaseAttributeKey) !== -1 && tag[lowerCaseAttributeKey]) {\n                    return innermostBaseTag.concat(tag);\n                }\n            }\n        }\n\n        return innermostBaseTag;\n    }, []);\n};\n\nvar getTagsFromPropsList = function getTagsFromPropsList(tagName, primaryAttributes, propsList) {\n    // Calculate list of tags, giving priority innermost component (end of the propslist)\n    var approvedSeenTags = {};\n\n    return propsList.filter(function (props) {\n        if (Array.isArray(props[tagName])) {\n            return true;\n        }\n        if (typeof props[tagName] !== \"undefined\") {\n            warn(\"Helmet: \" + tagName + \" should be of type \\\"Array\\\". Instead found type \\\"\" + _typeof(props[tagName]) + \"\\\"\");\n        }\n        return false;\n    }).map(function (props) {\n        return props[tagName];\n    }).reverse().reduce(function (approvedTags, instanceTags) {\n        var instanceSeenTags = {};\n\n        instanceTags.filter(function (tag) {\n            var primaryAttributeKey = void 0;\n            var keys = Object.keys(tag);\n            for (var i = 0; i < keys.length; i++) {\n                var attributeKey = keys[i];\n                var lowerCaseAttributeKey = attributeKey.toLowerCase();\n\n                // Special rule with link tags, since rel and href are both primary tags, rel takes priority\n                if (primaryAttributes.indexOf(lowerCaseAttributeKey) !== -1 && !(primaryAttributeKey === TAG_PROPERTIES.REL && tag[primaryAttributeKey].toLowerCase() === \"canonical\") && !(lowerCaseAttributeKey === TAG_PROPERTIES.REL && tag[lowerCaseAttributeKey].toLowerCase() === \"stylesheet\")) {\n                    primaryAttributeKey = lowerCaseAttributeKey;\n                }\n                // Special case for innerHTML which doesn't work lowercased\n                if (primaryAttributes.indexOf(attributeKey) !== -1 && (attributeKey === TAG_PROPERTIES.INNER_HTML || attributeKey === TAG_PROPERTIES.CSS_TEXT || attributeKey === TAG_PROPERTIES.ITEM_PROP)) {\n                    primaryAttributeKey = attributeKey;\n                }\n            }\n\n            if (!primaryAttributeKey || !tag[primaryAttributeKey]) {\n                return false;\n            }\n\n            var value = tag[primaryAttributeKey].toLowerCase();\n\n            if (!approvedSeenTags[primaryAttributeKey]) {\n                approvedSeenTags[primaryAttributeKey] = {};\n            }\n\n            if (!instanceSeenTags[primaryAttributeKey]) {\n                instanceSeenTags[primaryAttributeKey] = {};\n            }\n\n            if (!approvedSeenTags[primaryAttributeKey][value]) {\n                instanceSeenTags[primaryAttributeKey][value] = true;\n                return true;\n            }\n\n            return false;\n        }).reverse().forEach(function (tag) {\n            return approvedTags.push(tag);\n        });\n\n        // Update seen tags with tags from this instance\n        var keys = Object.keys(instanceSeenTags);\n        for (var i = 0; i < keys.length; i++) {\n            var attributeKey = keys[i];\n            var tagUnion = objectAssign({}, approvedSeenTags[attributeKey], instanceSeenTags[attributeKey]);\n\n            approvedSeenTags[attributeKey] = tagUnion;\n        }\n\n        return approvedTags;\n    }, []).reverse();\n};\n\nvar getInnermostProperty = function getInnermostProperty(propsList, property) {\n    for (var i = propsList.length - 1; i >= 0; i--) {\n        var props = propsList[i];\n\n        if (props.hasOwnProperty(property)) {\n            return props[property];\n        }\n    }\n\n    return null;\n};\n\nvar reducePropsToState = function reducePropsToState(propsList) {\n    return {\n        baseTag: getBaseTagFromPropsList([TAG_PROPERTIES.HREF], propsList),\n        bodyAttributes: getAttributesFromPropsList(ATTRIBUTE_NAMES.BODY, propsList),\n        defer: getInnermostProperty(propsList, HELMET_PROPS.DEFER),\n        encode: getInnermostProperty(propsList, HELMET_PROPS.ENCODE_SPECIAL_CHARACTERS),\n        htmlAttributes: getAttributesFromPropsList(ATTRIBUTE_NAMES.HTML, propsList),\n        linkTags: getTagsFromPropsList(TAG_NAMES.LINK, [TAG_PROPERTIES.REL, TAG_PROPERTIES.HREF], propsList),\n        metaTags: getTagsFromPropsList(TAG_NAMES.META, [TAG_PROPERTIES.NAME, TAG_PROPERTIES.CHARSET, TAG_PROPERTIES.HTTPEQUIV, TAG_PROPERTIES.PROPERTY, TAG_PROPERTIES.ITEM_PROP], propsList),\n        noscriptTags: getTagsFromPropsList(TAG_NAMES.NOSCRIPT, [TAG_PROPERTIES.INNER_HTML], propsList),\n        onChangeClientState: getOnChangeClientState(propsList),\n        scriptTags: getTagsFromPropsList(TAG_NAMES.SCRIPT, [TAG_PROPERTIES.SRC, TAG_PROPERTIES.INNER_HTML], propsList),\n        styleTags: getTagsFromPropsList(TAG_NAMES.STYLE, [TAG_PROPERTIES.CSS_TEXT], propsList),\n        title: getTitleFromPropsList(propsList),\n        titleAttributes: getAttributesFromPropsList(ATTRIBUTE_NAMES.TITLE, propsList)\n    };\n};\n\nvar rafPolyfill = function () {\n    var clock = Date.now();\n\n    return function (callback) {\n        var currentTime = Date.now();\n\n        if (currentTime - clock > 16) {\n            clock = currentTime;\n            callback(currentTime);\n        } else {\n            setTimeout(function () {\n                rafPolyfill(callback);\n            }, 0);\n        }\n    };\n}();\n\nvar cafPolyfill = function cafPolyfill(id) {\n    return clearTimeout(id);\n};\n\nvar requestAnimationFrame = typeof window !== \"undefined\" ? window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || rafPolyfill : global.requestAnimationFrame || rafPolyfill;\n\nvar cancelAnimationFrame = typeof window !== \"undefined\" ? window.cancelAnimationFrame || window.webkitCancelAnimationFrame || window.mozCancelAnimationFrame || cafPolyfill : global.cancelAnimationFrame || cafPolyfill;\n\nvar warn = function warn(msg) {\n    return console && typeof console.warn === \"function\" && console.warn(msg);\n};\n\nvar _helmetCallback = null;\n\nvar handleClientStateChange = function handleClientStateChange(newState) {\n    if (_helmetCallback) {\n        cancelAnimationFrame(_helmetCallback);\n    }\n\n    if (newState.defer) {\n        _helmetCallback = requestAnimationFrame(function () {\n            commitTagChanges(newState, function () {\n                _helmetCallback = null;\n            });\n        });\n    } else {\n        commitTagChanges(newState);\n        _helmetCallback = null;\n    }\n};\n\nvar commitTagChanges = function commitTagChanges(newState, cb) {\n    var baseTag = newState.baseTag,\n        bodyAttributes = newState.bodyAttributes,\n        htmlAttributes = newState.htmlAttributes,\n        linkTags = newState.linkTags,\n        metaTags = newState.metaTags,\n        noscriptTags = newState.noscriptTags,\n        onChangeClientState = newState.onChangeClientState,\n        scriptTags = newState.scriptTags,\n        styleTags = newState.styleTags,\n        title = newState.title,\n        titleAttributes = newState.titleAttributes;\n\n    updateAttributes(TAG_NAMES.BODY, bodyAttributes);\n    updateAttributes(TAG_NAMES.HTML, htmlAttributes);\n\n    updateTitle(title, titleAttributes);\n\n    var tagUpdates = {\n        baseTag: updateTags(TAG_NAMES.BASE, baseTag),\n        linkTags: updateTags(TAG_NAMES.LINK, linkTags),\n        metaTags: updateTags(TAG_NAMES.META, metaTags),\n        noscriptTags: updateTags(TAG_NAMES.NOSCRIPT, noscriptTags),\n        scriptTags: updateTags(TAG_NAMES.SCRIPT, scriptTags),\n        styleTags: updateTags(TAG_NAMES.STYLE, styleTags)\n    };\n\n    var addedTags = {};\n    var removedTags = {};\n\n    Object.keys(tagUpdates).forEach(function (tagType) {\n        var _tagUpdates$tagType = tagUpdates[tagType],\n            newTags = _tagUpdates$tagType.newTags,\n            oldTags = _tagUpdates$tagType.oldTags;\n\n\n        if (newTags.length) {\n            addedTags[tagType] = newTags;\n        }\n        if (oldTags.length) {\n            removedTags[tagType] = tagUpdates[tagType].oldTags;\n        }\n    });\n\n    cb && cb();\n\n    onChangeClientState(newState, addedTags, removedTags);\n};\n\nvar flattenArray = function flattenArray(possibleArray) {\n    return Array.isArray(possibleArray) ? possibleArray.join(\"\") : possibleArray;\n};\n\nvar updateTitle = function updateTitle(title, attributes) {\n    if (typeof title !== \"undefined\" && document.title !== title) {\n        document.title = flattenArray(title);\n    }\n\n    updateAttributes(TAG_NAMES.TITLE, attributes);\n};\n\nvar updateAttributes = function updateAttributes(tagName, attributes) {\n    var elementTag = document.getElementsByTagName(tagName)[0];\n\n    if (!elementTag) {\n        return;\n    }\n\n    var helmetAttributeString = elementTag.getAttribute(HELMET_ATTRIBUTE);\n    var helmetAttributes = helmetAttributeString ? helmetAttributeString.split(\",\") : [];\n    var attributesToRemove = [].concat(helmetAttributes);\n    var attributeKeys = Object.keys(attributes);\n\n    for (var i = 0; i < attributeKeys.length; i++) {\n        var attribute = attributeKeys[i];\n        var value = attributes[attribute] || \"\";\n\n        if (elementTag.getAttribute(attribute) !== value) {\n            elementTag.setAttribute(attribute, value);\n        }\n\n        if (helmetAttributes.indexOf(attribute) === -1) {\n            helmetAttributes.push(attribute);\n        }\n\n        var indexToSave = attributesToRemove.indexOf(attribute);\n        if (indexToSave !== -1) {\n            attributesToRemove.splice(indexToSave, 1);\n        }\n    }\n\n    for (var _i = attributesToRemove.length - 1; _i >= 0; _i--) {\n        elementTag.removeAttribute(attributesToRemove[_i]);\n    }\n\n    if (helmetAttributes.length === attributesToRemove.length) {\n        elementTag.removeAttribute(HELMET_ATTRIBUTE);\n    } else if (elementTag.getAttribute(HELMET_ATTRIBUTE) !== attributeKeys.join(\",\")) {\n        elementTag.setAttribute(HELMET_ATTRIBUTE, attributeKeys.join(\",\"));\n    }\n};\n\nvar updateTags = function updateTags(type, tags) {\n    var headElement = document.head || document.querySelector(TAG_NAMES.HEAD);\n    var tagNodes = headElement.querySelectorAll(type + \"[\" + HELMET_ATTRIBUTE + \"]\");\n    var oldTags = Array.prototype.slice.call(tagNodes);\n    var newTags = [];\n    var indexToDelete = void 0;\n\n    if (tags && tags.length) {\n        tags.forEach(function (tag) {\n            var newElement = document.createElement(type);\n\n            for (var attribute in tag) {\n                if (tag.hasOwnProperty(attribute)) {\n                    if (attribute === TAG_PROPERTIES.INNER_HTML) {\n                        newElement.innerHTML = tag.innerHTML;\n                    } else if (attribute === TAG_PROPERTIES.CSS_TEXT) {\n                        if (newElement.styleSheet) {\n                            newElement.styleSheet.cssText = tag.cssText;\n                        } else {\n                            newElement.appendChild(document.createTextNode(tag.cssText));\n                        }\n                    } else {\n                        var value = typeof tag[attribute] === \"undefined\" ? \"\" : tag[attribute];\n                        newElement.setAttribute(attribute, value);\n                    }\n                }\n            }\n\n            newElement.setAttribute(HELMET_ATTRIBUTE, \"true\");\n\n            // Remove a duplicate tag from domTagstoRemove, so it isn't cleared.\n            if (oldTags.some(function (existingTag, index) {\n                indexToDelete = index;\n                return newElement.isEqualNode(existingTag);\n            })) {\n                oldTags.splice(indexToDelete, 1);\n            } else {\n                newTags.push(newElement);\n            }\n        });\n    }\n\n    oldTags.forEach(function (tag) {\n        return tag.parentNode.removeChild(tag);\n    });\n    newTags.forEach(function (tag) {\n        return headElement.appendChild(tag);\n    });\n\n    return {\n        oldTags: oldTags,\n        newTags: newTags\n    };\n};\n\nvar generateElementAttributesAsString = function generateElementAttributesAsString(attributes) {\n    return Object.keys(attributes).reduce(function (str, key) {\n        var attr = typeof attributes[key] !== \"undefined\" ? key + \"=\\\"\" + attributes[key] + \"\\\"\" : \"\" + key;\n        return str ? str + \" \" + attr : attr;\n    }, \"\");\n};\n\nvar generateTitleAsString = function generateTitleAsString(type, title, attributes, encode) {\n    var attributeString = generateElementAttributesAsString(attributes);\n    var flattenedTitle = flattenArray(title);\n    return attributeString ? \"<\" + type + \" \" + HELMET_ATTRIBUTE + \"=\\\"true\\\" \" + attributeString + \">\" + encodeSpecialCharacters(flattenedTitle, encode) + \"</\" + type + \">\" : \"<\" + type + \" \" + HELMET_ATTRIBUTE + \"=\\\"true\\\">\" + encodeSpecialCharacters(flattenedTitle, encode) + \"</\" + type + \">\";\n};\n\nvar generateTagsAsString = function generateTagsAsString(type, tags, encode) {\n    return tags.reduce(function (str, tag) {\n        var attributeHtml = Object.keys(tag).filter(function (attribute) {\n            return !(attribute === TAG_PROPERTIES.INNER_HTML || attribute === TAG_PROPERTIES.CSS_TEXT);\n        }).reduce(function (string, attribute) {\n            var attr = typeof tag[attribute] === \"undefined\" ? attribute : attribute + \"=\\\"\" + encodeSpecialCharacters(tag[attribute], encode) + \"\\\"\";\n            return string ? string + \" \" + attr : attr;\n        }, \"\");\n\n        var tagContent = tag.innerHTML || tag.cssText || \"\";\n\n        var isSelfClosing = SELF_CLOSING_TAGS.indexOf(type) === -1;\n\n        return str + \"<\" + type + \" \" + HELMET_ATTRIBUTE + \"=\\\"true\\\" \" + attributeHtml + (isSelfClosing ? \"/>\" : \">\" + tagContent + \"</\" + type + \">\");\n    }, \"\");\n};\n\nvar convertElementAttributestoReactProps = function convertElementAttributestoReactProps(attributes) {\n    var initProps = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n\n    return Object.keys(attributes).reduce(function (obj, key) {\n        obj[REACT_TAG_MAP[key] || key] = attributes[key];\n        return obj;\n    }, initProps);\n};\n\nvar convertReactPropstoHtmlAttributes = function convertReactPropstoHtmlAttributes(props) {\n    var initAttributes = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n\n    return Object.keys(props).reduce(function (obj, key) {\n        obj[HTML_TAG_MAP[key] || key] = props[key];\n        return obj;\n    }, initAttributes);\n};\n\nvar generateTitleAsReactComponent = function generateTitleAsReactComponent(type, title, attributes) {\n    var _initProps;\n\n    // assigning into an array to define toString function on it\n    var initProps = (_initProps = {\n        key: title\n    }, _initProps[HELMET_ATTRIBUTE] = true, _initProps);\n    var props = convertElementAttributestoReactProps(attributes, initProps);\n\n    return [React.createElement(TAG_NAMES.TITLE, props, title)];\n};\n\nvar generateTagsAsReactComponent = function generateTagsAsReactComponent(type, tags) {\n    return tags.map(function (tag, i) {\n        var _mappedTag;\n\n        var mappedTag = (_mappedTag = {\n            key: i\n        }, _mappedTag[HELMET_ATTRIBUTE] = true, _mappedTag);\n\n        Object.keys(tag).forEach(function (attribute) {\n            var mappedAttribute = REACT_TAG_MAP[attribute] || attribute;\n\n            if (mappedAttribute === TAG_PROPERTIES.INNER_HTML || mappedAttribute === TAG_PROPERTIES.CSS_TEXT) {\n                var content = tag.innerHTML || tag.cssText;\n                mappedTag.dangerouslySetInnerHTML = { __html: content };\n            } else {\n                mappedTag[mappedAttribute] = tag[attribute];\n            }\n        });\n\n        return React.createElement(type, mappedTag);\n    });\n};\n\nvar getMethodsForTag = function getMethodsForTag(type, tags, encode) {\n    switch (type) {\n        case TAG_NAMES.TITLE:\n            return {\n                toComponent: function toComponent() {\n                    return generateTitleAsReactComponent(type, tags.title, tags.titleAttributes, encode);\n                },\n                toString: function toString() {\n                    return generateTitleAsString(type, tags.title, tags.titleAttributes, encode);\n                }\n            };\n        case ATTRIBUTE_NAMES.BODY:\n        case ATTRIBUTE_NAMES.HTML:\n            return {\n                toComponent: function toComponent() {\n                    return convertElementAttributestoReactProps(tags);\n                },\n                toString: function toString() {\n                    return generateElementAttributesAsString(tags);\n                }\n            };\n        default:\n            return {\n                toComponent: function toComponent() {\n                    return generateTagsAsReactComponent(type, tags);\n                },\n                toString: function toString() {\n                    return generateTagsAsString(type, tags, encode);\n                }\n            };\n    }\n};\n\nvar mapStateOnServer = function mapStateOnServer(_ref) {\n    var baseTag = _ref.baseTag,\n        bodyAttributes = _ref.bodyAttributes,\n        encode = _ref.encode,\n        htmlAttributes = _ref.htmlAttributes,\n        linkTags = _ref.linkTags,\n        metaTags = _ref.metaTags,\n        noscriptTags = _ref.noscriptTags,\n        scriptTags = _ref.scriptTags,\n        styleTags = _ref.styleTags,\n        _ref$title = _ref.title,\n        title = _ref$title === undefined ? \"\" : _ref$title,\n        titleAttributes = _ref.titleAttributes;\n    return {\n        base: getMethodsForTag(TAG_NAMES.BASE, baseTag, encode),\n        bodyAttributes: getMethodsForTag(ATTRIBUTE_NAMES.BODY, bodyAttributes, encode),\n        htmlAttributes: getMethodsForTag(ATTRIBUTE_NAMES.HTML, htmlAttributes, encode),\n        link: getMethodsForTag(TAG_NAMES.LINK, linkTags, encode),\n        meta: getMethodsForTag(TAG_NAMES.META, metaTags, encode),\n        noscript: getMethodsForTag(TAG_NAMES.NOSCRIPT, noscriptTags, encode),\n        script: getMethodsForTag(TAG_NAMES.SCRIPT, scriptTags, encode),\n        style: getMethodsForTag(TAG_NAMES.STYLE, styleTags, encode),\n        title: getMethodsForTag(TAG_NAMES.TITLE, { title: title, titleAttributes: titleAttributes }, encode)\n    };\n};\n\nvar Helmet = function Helmet(Component) {\n    var _class, _temp;\n\n    return _temp = _class = function (_React$Component) {\n        inherits(HelmetWrapper, _React$Component);\n\n        function HelmetWrapper() {\n            classCallCheck(this, HelmetWrapper);\n            return possibleConstructorReturn(this, _React$Component.apply(this, arguments));\n        }\n\n        HelmetWrapper.prototype.shouldComponentUpdate = function shouldComponentUpdate(nextProps) {\n            return !isEqual(this.props, nextProps);\n        };\n\n        HelmetWrapper.prototype.mapNestedChildrenToProps = function mapNestedChildrenToProps(child, nestedChildren) {\n            if (!nestedChildren) {\n                return null;\n            }\n\n            switch (child.type) {\n                case TAG_NAMES.SCRIPT:\n                case TAG_NAMES.NOSCRIPT:\n                    return {\n                        innerHTML: nestedChildren\n                    };\n\n                case TAG_NAMES.STYLE:\n                    return {\n                        cssText: nestedChildren\n                    };\n            }\n\n            throw new Error(\"<\" + child.type + \" /> elements are self-closing and can not contain children. Refer to our API for more information.\");\n        };\n\n        HelmetWrapper.prototype.flattenArrayTypeChildren = function flattenArrayTypeChildren(_ref) {\n            var _babelHelpers$extends;\n\n            var child = _ref.child,\n                arrayTypeChildren = _ref.arrayTypeChildren,\n                newChildProps = _ref.newChildProps,\n                nestedChildren = _ref.nestedChildren;\n\n            return _extends({}, arrayTypeChildren, (_babelHelpers$extends = {}, _babelHelpers$extends[child.type] = [].concat(arrayTypeChildren[child.type] || [], [_extends({}, newChildProps, this.mapNestedChildrenToProps(child, nestedChildren))]), _babelHelpers$extends));\n        };\n\n        HelmetWrapper.prototype.mapObjectTypeChildren = function mapObjectTypeChildren(_ref2) {\n            var _babelHelpers$extends2, _babelHelpers$extends3;\n\n            var child = _ref2.child,\n                newProps = _ref2.newProps,\n                newChildProps = _ref2.newChildProps,\n                nestedChildren = _ref2.nestedChildren;\n\n            switch (child.type) {\n                case TAG_NAMES.TITLE:\n                    return _extends({}, newProps, (_babelHelpers$extends2 = {}, _babelHelpers$extends2[child.type] = nestedChildren, _babelHelpers$extends2.titleAttributes = _extends({}, newChildProps), _babelHelpers$extends2));\n\n                case TAG_NAMES.BODY:\n                    return _extends({}, newProps, {\n                        bodyAttributes: _extends({}, newChildProps)\n                    });\n\n                case TAG_NAMES.HTML:\n                    return _extends({}, newProps, {\n                        htmlAttributes: _extends({}, newChildProps)\n                    });\n            }\n\n            return _extends({}, newProps, (_babelHelpers$extends3 = {}, _babelHelpers$extends3[child.type] = _extends({}, newChildProps), _babelHelpers$extends3));\n        };\n\n        HelmetWrapper.prototype.mapArrayTypeChildrenToProps = function mapArrayTypeChildrenToProps(arrayTypeChildren, newProps) {\n            var newFlattenedProps = _extends({}, newProps);\n\n            Object.keys(arrayTypeChildren).forEach(function (arrayChildName) {\n                var _babelHelpers$extends4;\n\n                newFlattenedProps = _extends({}, newFlattenedProps, (_babelHelpers$extends4 = {}, _babelHelpers$extends4[arrayChildName] = arrayTypeChildren[arrayChildName], _babelHelpers$extends4));\n            });\n\n            return newFlattenedProps;\n        };\n\n        HelmetWrapper.prototype.warnOnInvalidChildren = function warnOnInvalidChildren(child, nestedChildren) {\n            if (process.env.NODE_ENV !== \"production\") {\n                if (!VALID_TAG_NAMES.some(function (name) {\n                    return child.type === name;\n                })) {\n                    if (typeof child.type === \"function\") {\n                        return warn(\"You may be attempting to nest <Helmet> components within each other, which is not allowed. Refer to our API for more information.\");\n                    }\n\n                    return warn(\"Only elements types \" + VALID_TAG_NAMES.join(\", \") + \" are allowed. Helmet does not support rendering <\" + child.type + \"> elements. Refer to our API for more information.\");\n                }\n\n                if (nestedChildren && typeof nestedChildren !== \"string\" && (!Array.isArray(nestedChildren) || nestedChildren.some(function (nestedChild) {\n                    return typeof nestedChild !== \"string\";\n                }))) {\n                    throw new Error(\"Helmet expects a string as a child of <\" + child.type + \">. Did you forget to wrap your children in braces? ( <\" + child.type + \">{``}</\" + child.type + \"> ) Refer to our API for more information.\");\n                }\n            }\n\n            return true;\n        };\n\n        HelmetWrapper.prototype.mapChildrenToProps = function mapChildrenToProps(children, newProps) {\n            var _this2 = this;\n\n            var arrayTypeChildren = {};\n\n            React.Children.forEach(children, function (child) {\n                if (!child || !child.props) {\n                    return;\n                }\n\n                var _child$props = child.props,\n                    nestedChildren = _child$props.children,\n                    childProps = objectWithoutProperties(_child$props, [\"children\"]);\n\n                var newChildProps = convertReactPropstoHtmlAttributes(childProps);\n\n                _this2.warnOnInvalidChildren(child, nestedChildren);\n\n                switch (child.type) {\n                    case TAG_NAMES.LINK:\n                    case TAG_NAMES.META:\n                    case TAG_NAMES.NOSCRIPT:\n                    case TAG_NAMES.SCRIPT:\n                    case TAG_NAMES.STYLE:\n                        arrayTypeChildren = _this2.flattenArrayTypeChildren({\n                            child: child,\n                            arrayTypeChildren: arrayTypeChildren,\n                            newChildProps: newChildProps,\n                            nestedChildren: nestedChildren\n                        });\n                        break;\n\n                    default:\n                        newProps = _this2.mapObjectTypeChildren({\n                            child: child,\n                            newProps: newProps,\n                            newChildProps: newChildProps,\n                            nestedChildren: nestedChildren\n                        });\n                        break;\n                }\n            });\n\n            newProps = this.mapArrayTypeChildrenToProps(arrayTypeChildren, newProps);\n            return newProps;\n        };\n\n        HelmetWrapper.prototype.render = function render() {\n            var _props = this.props,\n                children = _props.children,\n                props = objectWithoutProperties(_props, [\"children\"]);\n\n            var newProps = _extends({}, props);\n\n            if (children) {\n                newProps = this.mapChildrenToProps(children, newProps);\n            }\n\n            return React.createElement(Component, newProps);\n        };\n\n        createClass(HelmetWrapper, null, [{\n            key: \"canUseDOM\",\n\n\n            // Component.peek comes from react-side-effect:\n            // For testing, you may use a static peek() method available on the returned component.\n            // It lets you get the current state without resetting the mounted instance stack.\n            // Don’t use it for anything other than testing.\n\n            /**\n            * @param {Object} base: {\"target\": \"_blank\", \"href\": \"http://mysite.com/\"}\n            * @param {Object} bodyAttributes: {\"className\": \"root\"}\n            * @param {String} defaultTitle: \"Default Title\"\n            * @param {Boolean} defer: true\n            * @param {Boolean} encodeSpecialCharacters: true\n            * @param {Object} htmlAttributes: {\"lang\": \"en\", \"amp\": undefined}\n            * @param {Array} link: [{\"rel\": \"canonical\", \"href\": \"http://mysite.com/example\"}]\n            * @param {Array} meta: [{\"name\": \"description\", \"content\": \"Test description\"}]\n            * @param {Array} noscript: [{\"innerHTML\": \"<img src='http://mysite.com/js/test.js'\"}]\n            * @param {Function} onChangeClientState: \"(newState) => console.log(newState)\"\n            * @param {Array} script: [{\"type\": \"text/javascript\", \"src\": \"http://mysite.com/js/test.js\"}]\n            * @param {Array} style: [{\"type\": \"text/css\", \"cssText\": \"div { display: block; color: blue; }\"}]\n            * @param {String} title: \"Title\"\n            * @param {Object} titleAttributes: {\"itemprop\": \"name\"}\n            * @param {String} titleTemplate: \"MySite.com - %s\"\n            */\n            set: function set$$1(canUseDOM) {\n                Component.canUseDOM = canUseDOM;\n            }\n        }]);\n        return HelmetWrapper;\n    }(React.Component), _class.propTypes = {\n        base: PropTypes.object,\n        bodyAttributes: PropTypes.object,\n        children: PropTypes.oneOfType([PropTypes.arrayOf(PropTypes.node), PropTypes.node]),\n        defaultTitle: PropTypes.string,\n        defer: PropTypes.bool,\n        encodeSpecialCharacters: PropTypes.bool,\n        htmlAttributes: PropTypes.object,\n        link: PropTypes.arrayOf(PropTypes.object),\n        meta: PropTypes.arrayOf(PropTypes.object),\n        noscript: PropTypes.arrayOf(PropTypes.object),\n        onChangeClientState: PropTypes.func,\n        script: PropTypes.arrayOf(PropTypes.object),\n        style: PropTypes.arrayOf(PropTypes.object),\n        title: PropTypes.string,\n        titleAttributes: PropTypes.object,\n        titleTemplate: PropTypes.string\n    }, _class.defaultProps = {\n        defer: true,\n        encodeSpecialCharacters: true\n    }, _class.peek = Component.peek, _class.rewind = function () {\n        var mappedState = Component.rewind();\n        if (!mappedState) {\n            // provide fallback if mappedState is undefined\n            mappedState = mapStateOnServer({\n                baseTag: [],\n                bodyAttributes: {},\n                encodeSpecialCharacters: true,\n                htmlAttributes: {},\n                linkTags: [],\n                metaTags: [],\n                noscriptTags: [],\n                scriptTags: [],\n                styleTags: [],\n                title: \"\",\n                titleAttributes: {}\n            });\n        }\n\n        return mappedState;\n    }, _temp;\n};\n\nvar NullComponent = function NullComponent() {\n    return null;\n};\n\nvar HelmetSideEffects = withSideEffect(reducePropsToState, handleClientStateChange, mapStateOnServer)(NullComponent);\n\nvar HelmetExport = Helmet(HelmetSideEffects);\nHelmetExport.renderStatic = HelmetExport.rewind;\n\nexports.Helmet = HelmetExport;\n","'use strict';\n\nfunction _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }\n\nvar React = require('react');\nvar React__default = _interopDefault(React);\nvar shallowEqual = _interopDefault(require('shallowequal'));\n\nfunction _defineProperty(obj, key, value) {\n  if (key in obj) {\n    Object.defineProperty(obj, key, {\n      value: value,\n      enumerable: true,\n      configurable: true,\n      writable: true\n    });\n  } else {\n    obj[key] = value;\n  }\n\n  return obj;\n}\n\nfunction _inheritsLoose(subClass, superClass) {\n  subClass.prototype = Object.create(superClass.prototype);\n  subClass.prototype.constructor = subClass;\n  subClass.__proto__ = superClass;\n}\n\nvar canUseDOM = !!(typeof window !== 'undefined' && window.document && window.document.createElement);\nfunction withSideEffect(reducePropsToState, handleStateChangeOnClient, mapStateOnServer) {\n  if (typeof reducePropsToState !== 'function') {\n    throw new Error('Expected reducePropsToState to be a function.');\n  }\n\n  if (typeof handleStateChangeOnClient !== 'function') {\n    throw new Error('Expected handleStateChangeOnClient to be a function.');\n  }\n\n  if (typeof mapStateOnServer !== 'undefined' && typeof mapStateOnServer !== 'function') {\n    throw new Error('Expected mapStateOnServer to either be undefined or a function.');\n  }\n\n  function getDisplayName(WrappedComponent) {\n    return WrappedComponent.displayName || WrappedComponent.name || 'Component';\n  }\n\n  return function wrap(WrappedComponent) {\n    if (typeof WrappedComponent !== 'function') {\n      throw new Error('Expected WrappedComponent to be a React component.');\n    }\n\n    var mountedInstances = [];\n    var state;\n\n    function emitChange() {\n      state = reducePropsToState(mountedInstances.map(function (instance) {\n        return instance.props;\n      }));\n\n      if (SideEffect.canUseDOM) {\n        handleStateChangeOnClient(state);\n      } else if (mapStateOnServer) {\n        state = mapStateOnServer(state);\n      }\n    }\n\n    var SideEffect =\n    /*#__PURE__*/\n    function (_Component) {\n      _inheritsLoose(SideEffect, _Component);\n\n      function SideEffect() {\n        return _Component.apply(this, arguments) || this;\n      }\n\n      // Try to use displayName of wrapped component\n      // Expose canUseDOM so tests can monkeypatch it\n      SideEffect.peek = function peek() {\n        return state;\n      };\n\n      SideEffect.rewind = function rewind() {\n        if (SideEffect.canUseDOM) {\n          throw new Error('You may only call rewind() on the server. Call peek() to read the current state.');\n        }\n\n        var recordedState = state;\n        state = undefined;\n        mountedInstances = [];\n        return recordedState;\n      };\n\n      var _proto = SideEffect.prototype;\n\n      _proto.shouldComponentUpdate = function shouldComponentUpdate(nextProps) {\n        return !shallowEqual(nextProps, this.props);\n      };\n\n      _proto.componentWillMount = function componentWillMount() {\n        mountedInstances.push(this);\n        emitChange();\n      };\n\n      _proto.componentDidUpdate = function componentDidUpdate() {\n        emitChange();\n      };\n\n      _proto.componentWillUnmount = function componentWillUnmount() {\n        var index = mountedInstances.indexOf(this);\n        mountedInstances.splice(index, 1);\n        emitChange();\n      };\n\n      _proto.render = function render() {\n        return React__default.createElement(WrappedComponent, this.props);\n      };\n\n      return SideEffect;\n    }(React.Component);\n\n    _defineProperty(SideEffect, \"displayName\", \"SideEffect(\" + getDisplayName(WrappedComponent) + \")\");\n\n    _defineProperty(SideEffect, \"canUseDOM\", canUseDOM);\n\n    return SideEffect;\n  };\n}\n\nmodule.exports = withSideEffect;\n","'use strict';\n\nvar isArray = Array.isArray;\nvar keyList = Object.keys;\nvar hasProp = Object.prototype.hasOwnProperty;\nvar hasElementType = typeof Element !== 'undefined';\n\nfunction equal(a, b) {\n  // fast-deep-equal index.js 2.0.1\n  if (a === b) return true;\n\n  if (a && b && typeof a == 'object' && typeof b == 'object') {\n    var arrA = isArray(a)\n      , arrB = isArray(b)\n      , i\n      , length\n      , key;\n\n    if (arrA && arrB) {\n      length = a.length;\n      if (length != b.length) return false;\n      for (i = length; i-- !== 0;)\n        if (!equal(a[i], b[i])) return false;\n      return true;\n    }\n\n    if (arrA != arrB) return false;\n\n    var dateA = a instanceof Date\n      , dateB = b instanceof Date;\n    if (dateA != dateB) return false;\n    if (dateA && dateB) return a.getTime() == b.getTime();\n\n    var regexpA = a instanceof RegExp\n      , regexpB = b instanceof RegExp;\n    if (regexpA != regexpB) return false;\n    if (regexpA && regexpB) return a.toString() == b.toString();\n\n    var keys = keyList(a);\n    length = keys.length;\n\n    if (length !== keyList(b).length)\n      return false;\n\n    for (i = length; i-- !== 0;)\n      if (!hasProp.call(b, keys[i])) return false;\n    // end fast-deep-equal\n\n    // start react-fast-compare\n    // custom handling for DOM elements\n    if (hasElementType && a instanceof Element && b instanceof Element)\n      return a === b;\n\n    // custom handling for React\n    for (i = length; i-- !== 0;) {\n      key = keys[i];\n      if (key === '_owner' && a.$$typeof) {\n        // React-specific: avoid traversing React elements' _owner.\n        //  _owner contains circular references\n        // and is not needed when comparing the actual elements (and not their owners)\n        // .$$typeof and ._store on just reasonable markers of a react element\n        continue;\n      } else {\n        // all other properties should be traversed as usual\n        if (!equal(a[key], b[key])) return false;\n      }\n    }\n    // end react-fast-compare\n\n    // fast-deep-equal index.js 2.0.1\n    return true;\n  }\n\n  return a !== a && b !== b;\n}\n// end fast-deep-equal\n\nmodule.exports = function exportedEqual(a, b) {\n  try {\n    return equal(a, b);\n  } catch (error) {\n    if ((error.message && error.message.match(/stack|recursion/i)) || (error.number === -2146828260)) {\n      // warn on circular references, don't crash\n      // browsers give this different errors name and messages:\n      // chrome/safari: \"RangeError\", \"Maximum call stack size exceeded\"\n      // firefox: \"InternalError\", too much recursion\"\n      // edge: \"Error\", \"Out of stack space\"\n      console.warn('Warning: react-fast-compare does not handle circular references.', error.name, error.message);\n      return false;\n    }\n    // some other error. we should definitely know about these\n    throw error;\n  }\n};\n"],"sourceRoot":""}