commons-153766aa3c01c6a658fa.js.map

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global Map:readonly, Set:readonly, ArrayBuffer:readonly */\nvar hasElementType = typeof Element !== 'undefined';\nvar hasMap = typeof Map === 'function';\nvar hasSet = typeof Set === 'function';\nvar hasArrayBuffer = typeof ArrayBuffer === 'function' && !!ArrayBuffer.isView; // Note: We **don't** need `envHasBigInt64Array` in fde es6/index.js\n\nfunction equal(a, b) {\n  // START: fast-deep-equal es6/index.js 3.1.1\n  if (a === b) return true;\n\n  if (a && b && typeof a == 'object' && typeof b == 'object') {\n    if (a.constructor !== b.constructor) return false;\n    var length, i, keys;\n\n    if (Array.isArray(a)) {\n      length = a.length;\n      if (length != b.length) return false;\n\n      for (i = length; i-- !== 0;) {\n        if (!equal(a[i], b[i])) return false;\n      }\n\n      return true;\n    } // START: Modifications:\n    // 1. Extra `has<Type> &&` helpers in initial condition allow es6 code\n    //    to co-exist with es5.\n    // 2. Replace `for of` with es5 compliant iteration using `for`.\n    //    Basically, take:\n    //\n    //    ```js\n    //    for (i of a.entries())\n    //      if (!b.has(i[0])) return false;\n    //    ```\n    //\n    //    ... and convert to:\n    //\n    //    ```js\n    //    it = a.entries();\n    //    while (!(i = it.next()).done)\n    //      if (!b.has(i.value[0])) return false;\n    //    ```\n    //\n    //    **Note**: `i` access switches to `i.value`.\n\n\n    var it;\n\n    if (hasMap && a instanceof Map && b instanceof Map) {\n      if (a.size !== b.size) return false;\n      it = a.entries();\n\n      while (!(i = it.next()).done) {\n        if (!b.has(i.value[0])) return false;\n      }\n\n      it = a.entries();\n\n      while (!(i = it.next()).done) {\n        if (!equal(i.value[1], b.get(i.value[0]))) return false;\n      }\n\n      return true;\n    }\n\n    if (hasSet && a instanceof Set && b instanceof Set) {\n      if (a.size !== b.size) return false;\n      it = a.entries();\n\n      while (!(i = it.next()).done) {\n        if (!b.has(i.value[0])) return false;\n      }\n\n      return true;\n    } // END: Modifications\n\n\n    if (hasArrayBuffer && ArrayBuffer.isView(a) && ArrayBuffer.isView(b)) {\n      length = a.length;\n      if (length != b.length) return false;\n\n      for (i = length; i-- !== 0;) {\n        if (a[i] !== b[i]) return false;\n      }\n\n      return true;\n    }\n\n    if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;\n    if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();\n    if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();\n    keys = Object.keys(a);\n    length = keys.length;\n    if (length !== Object.keys(b).length) return false;\n\n    for (i = length; i-- !== 0;) {\n      if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;\n    } // END: fast-deep-equal\n    // START: react-fast-compare\n    // custom handling for DOM elements\n\n\n    if (hasElementType && a instanceof Element) return false; // custom handling for React/Preact\n\n    for (i = length; i-- !== 0;) {\n      if ((keys[i] === '_owner' || keys[i] === '__v' || keys[i] === '__o') && a.$$typeof) {\n        // React-specific: avoid traversing React elements' _owner\n        // Preact-specific: avoid traversing Preact elements' __v and __o\n        //    __v = $_original / $_vnode\n        //    __o = $_owner\n        // These properties contain circular references and are not needed when\n        // comparing the actual elements (and not their owners)\n        // .$$typeof and ._store on just reasonable markers of elements\n        continue;\n      } // all other properties should be traversed as usual\n\n\n      if (!equal(a[keys[i]], b[keys[i]])) return false;\n    } // END: react-fast-compare\n    // START: fast-deep-equal\n\n\n    return true;\n  }\n\n  return a !== a && b !== b;\n} // end fast-deep-equal\n\n\nmodule.exports = function isEqual(a, b) {\n  try {\n    return equal(a, b);\n  } catch (error) {\n    if ((error.message || '').match(/stack|recursion/i)) {\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('react-fast-compare cannot handle circular refs');\n      return false;\n    } // some other error. we should definitely know about these\n\n\n    throw error;\n  }\n};","import PropTypes from 'prop-types';\nimport withSideEffect from 'react-side-effect';\nimport isEqual from 'react-fast-compare';\nimport React from 'react';\nimport objectAssign from 'object-assign';\nvar ATTRIBUTE_NAMES = {\n  BODY: \"bodyAttributes\",\n  HTML: \"htmlAttributes\",\n  TITLE: \"titleAttributes\"\n};\nvar TAG_NAMES = {\n  BASE: \"base\",\n  BODY: \"body\",\n  HEAD: \"head\",\n  HTML: \"html\",\n  LINK: \"link\",\n  META: \"meta\",\n  NOSCRIPT: \"noscript\",\n  SCRIPT: \"script\",\n  STYLE: \"style\",\n  TITLE: \"title\"\n};\nvar VALID_TAG_NAMES = Object.keys(TAG_NAMES).map(function (name) {\n  return TAG_NAMES[name];\n});\nvar TAG_PROPERTIES = {\n  CHARSET: \"charset\",\n  CSS_TEXT: \"cssText\",\n  HREF: \"href\",\n  HTTPEQUIV: \"http-equiv\",\n  INNER_HTML: \"innerHTML\",\n  ITEM_PROP: \"itemprop\",\n  NAME: \"name\",\n  PROPERTY: \"property\",\n  REL: \"rel\",\n  SRC: \"src\",\n  TARGET: \"target\"\n};\nvar REACT_TAG_MAP = {\n  accesskey: \"accessKey\",\n  charset: \"charSet\",\n  class: \"className\",\n  contenteditable: \"contentEditable\",\n  contextmenu: \"contextMenu\",\n  \"http-equiv\": \"httpEquiv\",\n  itemprop: \"itemProp\",\n  tabindex: \"tabIndex\"\n};\nvar HELMET_PROPS = {\n  DEFAULT_TITLE: \"defaultTitle\",\n  DEFER: \"defer\",\n  ENCODE_SPECIAL_CHARACTERS: \"encodeSpecialCharacters\",\n  ON_CHANGE_CLIENT_STATE: \"onChangeClientState\",\n  TITLE_TEMPLATE: \"titleTemplate\"\n};\nvar HTML_TAG_MAP = Object.keys(REACT_TAG_MAP).reduce(function (obj, key) {\n  obj[REACT_TAG_MAP[key]] = key;\n  return obj;\n}, {});\nvar SELF_CLOSING_TAGS = [TAG_NAMES.NOSCRIPT, TAG_NAMES.SCRIPT, TAG_NAMES.STYLE];\nvar HELMET_ATTRIBUTE = \"data-react-helmet\";\n\nvar _typeof = typeof Symbol === \"function\" && typeof Symbol.iterator === \"symbol\" ? function (obj) {\n  return typeof obj;\n} : function (obj) {\n  return obj && typeof Symbol === \"function\" && obj.constructor === Symbol && obj !== Symbol.prototype ? \"symbol\" : typeof obj;\n};\n\nvar classCallCheck = function classCallCheck(instance, Constructor) {\n  if (!(instance instanceof Constructor)) {\n    throw new TypeError(\"Cannot call a class as a function\");\n  }\n};\n\nvar createClass = function () {\n  function defineProperties(target, props) {\n    for (var i = 0; i < props.length; i++) {\n      var descriptor = props[i];\n      descriptor.enumerable = descriptor.enumerable || false;\n      descriptor.configurable = true;\n      if (\"value\" in descriptor) descriptor.writable = true;\n      Object.defineProperty(target, descriptor.key, descriptor);\n    }\n  }\n\n  return function (Constructor, protoProps, staticProps) {\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 inherits(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 objectWithoutProperties(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 possibleConstructorReturn(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  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  return propsList.filter(function (props) {\n    if (Array.isArray(props[tagName])) {\n      return true;\n    }\n\n    if (typeof props[tagName] !== \"undefined\") {\n      warn(\"Helmet: \" + tagName + \" should be of type \\\"Array\\\". Instead found type \\\"\" + _typeof(props[tagName]) + \"\\\"\");\n    }\n\n    return false;\n  }).map(function (props) {\n    return props[tagName];\n  }).reverse().reduce(function (approvedTags, instanceTags) {\n    var instanceSeenTags = {};\n    instanceTags.filter(function (tag) {\n      var primaryAttributeKey = void 0;\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(); // Special rule with link tags, since rel and href are both primary tags, rel takes priority\n\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        } // Special case for innerHTML which doesn't work lowercased\n\n\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    }); // Update seen tags with tags from this instance\n\n    var keys = Object.keys(instanceSeenTags);\n\n    for (var i = 0; i < keys.length; i++) {\n      var attributeKey = keys[i];\n      var tagUnion = objectAssign({}, approvedSeenTags[attributeKey], instanceSeenTags[attributeKey]);\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, TAG_PROPERTIES.TARGET], 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  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.requestAnimationFrame.bind(window) || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || rafPolyfill : global.requestAnimationFrame || rafPolyfill;\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  updateAttributes(TAG_NAMES.BODY, bodyAttributes);\n  updateAttributes(TAG_NAMES.HTML, htmlAttributes);\n  updateTitle(title, titleAttributes);\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  var addedTags = {};\n  var removedTags = {};\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    if (newTags.length) {\n      addedTags[tagType] = newTags;\n    }\n\n    if (oldTags.length) {\n      removedTags[tagType] = tagUpdates[tagType].oldTags;\n    }\n  });\n  cb && cb();\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\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\"); // Remove a duplicate tag from domTagstoRemove, so it isn't cleared.\n\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  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    var tagContent = tag.innerHTML || tag.cssText || \"\";\n    var isSelfClosing = SELF_CLOSING_TAGS.indexOf(type) === -1;\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  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  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; // assigning into an array to define toString function on it\n\n\n  var initProps = (_initProps = {\n    key: title\n  }, _initProps[HELMET_ATTRIBUTE] = true, _initProps);\n  var props = convertElementAttributestoReactProps(attributes, initProps);\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    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 = {\n          __html: content\n        };\n      } else {\n        mappedTag[mappedAttribute] = tag[attribute];\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\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\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, {\n      title: title,\n      titleAttributes: titleAttributes\n    }, 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      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      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      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        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      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      // 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\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);\nvar HelmetExport = Helmet(HelmetSideEffects);\nHelmetExport.renderStatic = HelmetExport.rewind;\nexport default HelmetExport;\nexport { HelmetExport as Helmet };","'use strict';\n\nfunction _interopDefault(ex) {\n  return ex && typeof ex === 'object' && 'default' in ex ? ex['default'] : ex;\n}\n\nvar React = require('react');\n\nvar React__default = _interopDefault(React);\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);\n\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 = /*#__PURE__*/function (_PureComponent) {\n      _inheritsLoose(SideEffect, _PureComponent);\n\n      function SideEffect() {\n        return _PureComponent.apply(this, arguments) || this;\n      } // Try to use displayName of wrapped component\n      // Expose canUseDOM so tests can monkeypatch it\n\n\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.UNSAFE_componentWillMount = function UNSAFE_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 /*#__PURE__*/React__default.createElement(WrappedComponent, this.props);\n      };\n\n      return SideEffect;\n    }(React.PureComponent);\n\n    _defineProperty(SideEffect, \"displayName\", \"SideEffect(\" + getDisplayName(WrappedComponent) + \")\");\n\n    _defineProperty(SideEffect, \"canUseDOM\", canUseDOM);\n\n    return SideEffect;\n  };\n}\n\nmodule.exports = withSideEffect;","import React from \"react\"\nimport { useStaticQuery, Link, graphql } from \"gatsby\"\nimport \"./header.css\"\nimport { Helmet } from \"react-helmet\"\n\nconst ListLink = (props) => (\n    <li>\n        <Link to={props.to}>{props.children}</Link>\n    </li>\n)\nexport default function Header() {\n  const data = useStaticQuery(graphql`\n    query HeaderQuery {\n      site {\n        siteMetadata {\n          title\n        }\n      }\n    }\n  `)\n  return (\n    <header>\n        <Helmet title={data.site.siteMetadata.title} defer={false} />\n        <ul>\n        <ListLink to={`/about/`}>About</ListLink>\n        </ul>\n        <Link to={`/`}>\n        <h1>{data.site.siteMetadata.title}</h1>\n        </Link>\n    </header>\n  )\n}","import React from \"react\"\nimport Years from '../years.json'\n\nexport default () => {\n  return (\n    <div>\n      <span>Yearly Indexes: </span>\n      {Years.map((year) => (\n        <span>\n          <a href={`/${year}`}>\n            <span>{year}</span>\n          </a>\n          &#160;\n        </span>\n      ))}\n    </div>\n  )\n}","import React from \"react\"\nimport Header from \"./header.js\"\nimport \"./layout.css\"\nimport Years from \"./years\"\n\n\nconst Page = ({ children }) => {\n  return (\n    <div id=\"wrapper\">\n      <Header />\n      <hr />\n\n      {children}\n      <Years />\n    </div>\n  )\n}\n\nexport default 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