Revert "DEV: Drop old IE11 intersection-observer references" (#13017)

This reverts commit 7360a0f70f.

iOS still wants this sometimes. Probably best to revert for now and we can
always remove this again later.

See: https://meta.discourse.org/t/189799/11?u=blake

app/assets/javascripts/vendor.js

@@ -23,4 +23,5 @@
 //= require jquery.autoellipsis-1.0.10
 //= require virtual-dom
 //= require virtual-dom-amd
+//= require intersection-observer
 //= require discourse-shims

lib/tasks/javascript.rake

@@ -140,6 +140,9 @@ def dependencies
       source: 'mousetrap/plugins/global-bind/mousetrap-global-bind.js'
     }, {
       source: 'resumablejs/resumable.js'
+    }, {
+      # TODO: drop when we eventually drop IE11, this will land in iOS in version 13
+      source: 'intersection-observer/intersection-observer.js'
     }, {
       source: 'workbox-sw/build/.',
       destination: 'workbox',

package.json

@@ -19,6 +19,7 @@
     "eslint-config-discourse": "^1.1.8",
     "handlebars": "^4.7.0",
     "@highlightjs/cdn-assets": "^10.6.0",
+    "intersection-observer": "^0.5.1",
     "jquery": "3.5.1",
     "jquery-color": "3.0.0-alpha.1",
     "jquery-tags-input": "1.3.5",

vendor/assets/javascripts/intersection-observer.js

@@ -0,0 +1,726 @@
+/**
+ * Copyright 2016 Google Inc. All Rights Reserved.
+ *
+ * Licensed under the W3C SOFTWARE AND DOCUMENT NOTICE AND LICENSE.
+ *
+ *  https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document
+ *
+ */
+
+(function(window, document) {
+'use strict';
+
+
+// Exits early if all IntersectionObserver and IntersectionObserverEntry
+// features are natively supported.
+if ('IntersectionObserver' in window &&
+    'IntersectionObserverEntry' in window &&
+    'intersectionRatio' in window.IntersectionObserverEntry.prototype) {
+
+  // Minimal polyfill for Edge 15's lack of `isIntersecting`
+  // See: https://github.com/w3c/IntersectionObserver/issues/211
+  if (!('isIntersecting' in window.IntersectionObserverEntry.prototype)) {
+    Object.defineProperty(window.IntersectionObserverEntry.prototype,
+      'isIntersecting', {
+      get: function () {
+        return this.intersectionRatio > 0;
+      }
+    });
+  }
+  return;
+}
+
+
+/**
+ * An IntersectionObserver registry. This registry exists to hold a strong
+ * reference to IntersectionObserver instances currently observing a target
+ * element. Without this registry, instances without another reference may be
+ * garbage collected.
+ */
+var registry = [];
+
+
+/**
+ * Creates the global IntersectionObserverEntry constructor.
+ * https://w3c.github.io/IntersectionObserver/#intersection-observer-entry
+ * @param {Object} entry A dictionary of instance properties.
+ * @constructor
+ */
+function IntersectionObserverEntry(entry) {
+  this.time = entry.time;
+  this.target = entry.target;
+  this.rootBounds = entry.rootBounds;
+  this.boundingClientRect = entry.boundingClientRect;
+  this.intersectionRect = entry.intersectionRect || getEmptyRect();
+  this.isIntersecting = !!entry.intersectionRect;
+
+  // Calculates the intersection ratio.
+  var targetRect = this.boundingClientRect;
+  var targetArea = targetRect.width * targetRect.height;
+  var intersectionRect = this.intersectionRect;
+  var intersectionArea = intersectionRect.width * intersectionRect.height;
+
+  // Sets intersection ratio.
+  if (targetArea) {
+    // Round the intersection ratio to avoid floating point math issues:
+    // https://github.com/w3c/IntersectionObserver/issues/324
+    this.intersectionRatio = Number((intersectionArea / targetArea).toFixed(4));
+  } else {
+    // If area is zero and is intersecting, sets to 1, otherwise to 0
+    this.intersectionRatio = this.isIntersecting ? 1 : 0;
+  }
+}
+
+
+/**
+ * Creates the global IntersectionObserver constructor.
+ * https://w3c.github.io/IntersectionObserver/#intersection-observer-interface
+ * @param {Function} callback The function to be invoked after intersection
+ *     changes have queued. The function is not invoked if the queue has
+ *     been emptied by calling the `takeRecords` method.
+ * @param {Object=} opt_options Optional configuration options.
+ * @constructor
+ */
+function IntersectionObserver(callback, opt_options) {
+
+  var options = opt_options || {};
+
+  if (typeof callback != 'function') {
+    throw new Error('callback must be a function');
+  }
+
+  if (options.root && options.root.nodeType != 1) {
+    throw new Error('root must be an Element');
+  }
+
+  // Binds and throttles `this._checkForIntersections`.
+  this._checkForIntersections = throttle(
+      this._checkForIntersections.bind(this), this.THROTTLE_TIMEOUT);
+
+  // Private properties.
+  this._callback = callback;
+  this._observationTargets = [];
+  this._queuedEntries = [];
+  this._rootMarginValues = this._parseRootMargin(options.rootMargin);
+
+  // Public properties.
+  this.thresholds = this._initThresholds(options.threshold);
+  this.root = options.root || null;
+  this.rootMargin = this._rootMarginValues.map(function(margin) {
+    return margin.value + margin.unit;
+  }).join(' ');
+}
+
+
+/**
+ * The minimum interval within which the document will be checked for
+ * intersection changes.
+ */
+IntersectionObserver.prototype.THROTTLE_TIMEOUT = 100;
+
+
+/**
+ * The frequency in which the polyfill polls for intersection changes.
+ * this can be updated on a per instance basis and must be set prior to
+ * calling `observe` on the first target.
+ */
+IntersectionObserver.prototype.POLL_INTERVAL = null;
+
+/**
+ * Use a mutation observer on the root element
+ * to detect intersection changes.
+ */
+IntersectionObserver.prototype.USE_MUTATION_OBSERVER = true;
+
+
+/**
+ * Starts observing a target element for intersection changes based on
+ * the thresholds values.
+ * @param {Element} target The DOM element to observe.
+ */
+IntersectionObserver.prototype.observe = function(target) {
+  var isTargetAlreadyObserved = this._observationTargets.some(function(item) {
+    return item.element == target;
+  });
+
+  if (isTargetAlreadyObserved) {
+    return;
+  }
+
+  if (!(target && target.nodeType == 1)) {
+    throw new Error('target must be an Element');
+  }
+
+  this._registerInstance();
+  this._observationTargets.push({element: target, entry: null});
+  this._monitorIntersections();
+  this._checkForIntersections();
+};
+
+
+/**
+ * Stops observing a target element for intersection changes.
+ * @param {Element} target The DOM element to observe.
+ */
+IntersectionObserver.prototype.unobserve = function(target) {
+  this._observationTargets =
+      this._observationTargets.filter(function(item) {
+
+    return item.element != target;
+  });
+  if (!this._observationTargets.length) {
+    this._unmonitorIntersections();
+    this._unregisterInstance();
+  }
+};
+
+
+/**
+ * Stops observing all target elements for intersection changes.
+ */
+IntersectionObserver.prototype.disconnect = function() {
+  this._observationTargets = [];
+  this._unmonitorIntersections();
+  this._unregisterInstance();
+};
+
+
+/**
+ * Returns any queue entries that have not yet been reported to the
+ * callback and clears the queue. This can be used in conjunction with the
+ * callback to obtain the absolute most up-to-date intersection information.
+ * @return {Array} The currently queued entries.
+ */
+IntersectionObserver.prototype.takeRecords = function() {
+  var records = this._queuedEntries.slice();
+  this._queuedEntries = [];
+  return records;
+};
+
+
+/**
+ * Accepts the threshold value from the user configuration object and
+ * returns a sorted array of unique threshold values. If a value is not
+ * between 0 and 1 and error is thrown.
+ * @private
+ * @param {Array|number=} opt_threshold An optional threshold value or
+ *     a list of threshold values, defaulting to [0].
+ * @return {Array} A sorted list of unique and valid threshold values.
+ */
+IntersectionObserver.prototype._initThresholds = function(opt_threshold) {
+  var threshold = opt_threshold || [0];
+  if (!Array.isArray(threshold)) threshold = [threshold];
+
+  return threshold.sort().filter(function(t, i, a) {
+    if (typeof t != 'number' || isNaN(t) || t < 0 || t > 1) {
+      throw new Error('threshold must be a number between 0 and 1 inclusively');
+    }
+    return t !== a[i - 1];
+  });
+};
+
+
+/**
+ * Accepts the rootMargin value from the user configuration object
+ * and returns an array of the four margin values as an object containing
+ * the value and unit properties. If any of the values are not properly
+ * formatted or use a unit other than px or %, and error is thrown.
+ * @private
+ * @param {string=} opt_rootMargin An optional rootMargin value,
+ *     defaulting to '0px'.
+ * @return {Array<Object>} An array of margin objects with the keys
+ *     value and unit.
+ */
+IntersectionObserver.prototype._parseRootMargin = function(opt_rootMargin) {
+  var marginString = opt_rootMargin || '0px';
+  var margins = marginString.split(/\s+/).map(function(margin) {
+    var parts = /^(-?\d*\.?\d+)(px|%)$/.exec(margin);
+    if (!parts) {
+      throw new Error('rootMargin must be specified in pixels or percent');
+    }
+    return {value: parseFloat(parts[1]), unit: parts[2]};
+  });
+
+  // Handles shorthand.
+  margins[1] = margins[1] || margins[0];
+  margins[2] = margins[2] || margins[0];
+  margins[3] = margins[3] || margins[1];
+
+  return margins;
+};
+
+
+/**
+ * Starts polling for intersection changes if the polling is not already
+ * happening, and if the page's visibility state is visible.
+ * @private
+ */
+IntersectionObserver.prototype._monitorIntersections = function() {
+  if (!this._monitoringIntersections) {
+    this._monitoringIntersections = true;
+
+    // If a poll interval is set, use polling instead of listening to
+    // resize and scroll events or DOM mutations.
+    if (this.POLL_INTERVAL) {
+      this._monitoringInterval = setInterval(
+          this._checkForIntersections, this.POLL_INTERVAL);
+    }
+    else {
+      addEvent(window, 'resize', this._checkForIntersections, true);
+      addEvent(document, 'scroll', this._checkForIntersections, true);
+
+      if (this.USE_MUTATION_OBSERVER && 'MutationObserver' in window) {
+        this._domObserver = new MutationObserver(this._checkForIntersections);
+        this._domObserver.observe(document, {
+          attributes: true,
+          childList: true,
+          characterData: true,
+          subtree: true
+        });
+      }
+    }
+  }
+};
+
+
+/**
+ * Stops polling for intersection changes.
+ * @private
+ */
+IntersectionObserver.prototype._unmonitorIntersections = function() {
+  if (this._monitoringIntersections) {
+    this._monitoringIntersections = false;
+
+    clearInterval(this._monitoringInterval);
+    this._monitoringInterval = null;
+
+    removeEvent(window, 'resize', this._checkForIntersections, true);
+    removeEvent(document, 'scroll', this._checkForIntersections, true);
+
+    if (this._domObserver) {
+      this._domObserver.disconnect();
+      this._domObserver = null;
+    }
+  }
+};
+
+
+/**
+ * Scans each observation target for intersection changes and adds them
+ * to the internal entries queue. If new entries are found, it
+ * schedules the callback to be invoked.
+ * @private
+ */
+IntersectionObserver.prototype._checkForIntersections = function() {
+  var rootIsInDom = this._rootIsInDom();
+  var rootRect = rootIsInDom ? this._getRootRect() : getEmptyRect();
+
+  this._observationTargets.forEach(function(item) {
+    var target = item.element;
+    var targetRect = getBoundingClientRect(target);
+    var rootContainsTarget = this._rootContainsTarget(target);
+    var oldEntry = item.entry;
+    var intersectionRect = rootIsInDom && rootContainsTarget &&
+        this._computeTargetAndRootIntersection(target, rootRect);
+
+    var newEntry = item.entry = new IntersectionObserverEntry({
+      time: now(),
+      target: target,
+      boundingClientRect: targetRect,
+      rootBounds: rootRect,
+      intersectionRect: intersectionRect
+    });
+
+    if (!oldEntry) {
+      this._queuedEntries.push(newEntry);
+    } else if (rootIsInDom && rootContainsTarget) {
+      // If the new entry intersection ratio has crossed any of the
+      // thresholds, add a new entry.
+      if (this._hasCrossedThreshold(oldEntry, newEntry)) {
+        this._queuedEntries.push(newEntry);
+      }
+    } else {
+      // If the root is not in the DOM or target is not contained within
+      // root but the previous entry for this target had an intersection,
+      // add a new record indicating removal.
+      if (oldEntry && oldEntry.isIntersecting) {
+        this._queuedEntries.push(newEntry);
+      }
+    }
+  }, this);
+
+  if (this._queuedEntries.length) {
+    this._callback(this.takeRecords(), this);
+  }
+};
+
+
+/**
+ * Accepts a target and root rect computes the intersection between then
+ * following the algorithm in the spec.
+ * TODO(philipwalton): at this time clip-path is not considered.
+ * https://w3c.github.io/IntersectionObserver/#calculate-intersection-rect-algo
+ * @param {Element} target The target DOM element
+ * @param {Object} rootRect The bounding rect of the root after being
+ *     expanded by the rootMargin value.
+ * @return {?Object} The final intersection rect object or undefined if no
+ *     intersection is found.
+ * @private
+ */
+IntersectionObserver.prototype._computeTargetAndRootIntersection =
+    function(target, rootRect) {
+
+  // If the element isn't displayed, an intersection can't happen.
+  if (window.getComputedStyle(target).display == 'none') return;
+
+  var targetRect = getBoundingClientRect(target);
+  var intersectionRect = targetRect;
+  var parent = getParentNode(target);
+  var atRoot = false;
+
+  while (!atRoot) {
+    var parentRect = null;
+    var parentComputedStyle = parent.nodeType == 1 ?
+        window.getComputedStyle(parent) : {};
+
+    // If the parent isn't displayed, an intersection can't happen.
+    if (parentComputedStyle.display == 'none') return;
+
+    if (parent == this.root || parent == document) {
+      atRoot = true;
+      parentRect = rootRect;
+    } else {
+      // If the element has a non-visible overflow, and it's not the <body>
+      // or <html> element, update the intersection rect.
+      // Note: <body> and <html> cannot be clipped to a rect that's not also
+      // the document rect, so no need to compute a new intersection.
+      if (parent != document.body &&
+          parent != document.documentElement &&
+          parentComputedStyle.overflow != 'visible') {
+        parentRect = getBoundingClientRect(parent);
+      }
+    }
+
+    // If either of the above conditionals set a new parentRect,
+    // calculate new intersection data.
+    if (parentRect) {
+      intersectionRect = computeRectIntersection(parentRect, intersectionRect);
+
+      if (!intersectionRect) break;
+    }
+    parent = getParentNode(parent);
+  }
+  return intersectionRect;
+};
+
+
+/**
+ * Returns the root rect after being expanded by the rootMargin value.
+ * @return {Object} The expanded root rect.
+ * @private
+ */
+IntersectionObserver.prototype._getRootRect = function() {
+  var rootRect;
+  if (this.root) {
+    rootRect = getBoundingClientRect(this.root);
+  } else {
+    // Use <html>/<body> instead of window since scroll bars affect size.
+    var html = document.documentElement;
+    var body = document.body;
+    rootRect = {
+      top: 0,
+      left: 0,
+      right: html.clientWidth || body.clientWidth,
+      width: html.clientWidth || body.clientWidth,
+      bottom: html.clientHeight || body.clientHeight,
+      height: html.clientHeight || body.clientHeight
+    };
+  }
+  return this._expandRectByRootMargin(rootRect);
+};
+
+
+/**
+ * Accepts a rect and expands it by the rootMargin value.
+ * @param {Object} rect The rect object to expand.
+ * @return {Object} The expanded rect.
+ * @private
+ */
+IntersectionObserver.prototype._expandRectByRootMargin = function(rect) {
+  var margins = this._rootMarginValues.map(function(margin, i) {
+    return margin.unit == 'px' ? margin.value :
+        margin.value * (i % 2 ? rect.width : rect.height) / 100;
+  });
+  var newRect = {
+    top: rect.top - margins[0],
+    right: rect.right + margins[1],
+    bottom: rect.bottom + margins[2],
+    left: rect.left - margins[3]
+  };
+  newRect.width = newRect.right - newRect.left;
+  newRect.height = newRect.bottom - newRect.top;
+
+  return newRect;
+};
+
+
+/**
+ * Accepts an old and new entry and returns true if at least one of the
+ * threshold values has been crossed.
+ * @param {?IntersectionObserverEntry} oldEntry The previous entry for a
+ *    particular target element or null if no previous entry exists.
+ * @param {IntersectionObserverEntry} newEntry The current entry for a
+ *    particular target element.
+ * @return {boolean} Returns true if a any threshold has been crossed.
+ * @private
+ */
+IntersectionObserver.prototype._hasCrossedThreshold =
+    function(oldEntry, newEntry) {
+
+  // To make comparing easier, an entry that has a ratio of 0
+  // but does not actually intersect is given a value of -1
+  var oldRatio = oldEntry && oldEntry.isIntersecting ?
+      oldEntry.intersectionRatio || 0 : -1;
+  var newRatio = newEntry.isIntersecting ?
+      newEntry.intersectionRatio || 0 : -1;
+
+  // Ignore unchanged ratios
+  if (oldRatio === newRatio) return;
+
+  for (var i = 0; i < this.thresholds.length; i++) {
+    var threshold = this.thresholds[i];
+
+    // Return true if an entry matches a threshold or if the new ratio
+    // and the old ratio are on the opposite sides of a threshold.
+    if (threshold == oldRatio || threshold == newRatio ||
+        threshold < oldRatio !== threshold < newRatio) {
+      return true;
+    }
+  }
+};
+
+
+/**
+ * Returns whether or not the root element is an element and is in the DOM.
+ * @return {boolean} True if the root element is an element and is in the DOM.
+ * @private
+ */
+IntersectionObserver.prototype._rootIsInDom = function() {
+  return !this.root || containsDeep(document, this.root);
+};
+
+
+/**
+ * Returns whether or not the target element is a child of root.
+ * @param {Element} target The target element to check.
+ * @return {boolean} True if the target element is a child of root.
+ * @private
+ */
+IntersectionObserver.prototype._rootContainsTarget = function(target) {
+  return containsDeep(this.root || document, target);
+};
+
+
+/**
+ * Adds the instance to the global IntersectionObserver registry if it isn't
+ * already present.
+ * @private
+ */
+IntersectionObserver.prototype._registerInstance = function() {
+  if (registry.indexOf(this) < 0) {
+    registry.push(this);
+  }
+};
+
+
+/**
+ * Removes the instance from the global IntersectionObserver registry.
+ * @private
+ */
+IntersectionObserver.prototype._unregisterInstance = function() {
+  var index = registry.indexOf(this);
+  if (index != -1) registry.splice(index, 1);
+};
+
+
+/**
+ * Returns the result of the performance.now() method or null in browsers
+ * that don't support the API.
+ * @return {number} The elapsed time since the page was requested.
+ */
+function now() {
+  return window.performance && performance.now && performance.now();
+}
+
+
+/**
+ * Throttles a function and delays its execution, so it's only called at most
+ * once within a given time period.
+ * @param {Function} fn The function to throttle.
+ * @param {number} timeout The amount of time that must pass before the
+ *     function can be called again.
+ * @return {Function} The throttled function.
+ */
+function throttle(fn, timeout) {
+  var timer = null;
+  return function () {
+    if (!timer) {
+      timer = setTimeout(function() {
+        fn();
+        timer = null;
+      }, timeout);
+    }
+  };
+}
+
+
+/**
+ * Adds an event handler to a DOM node ensuring cross-browser compatibility.
+ * @param {Node} node The DOM node to add the event handler to.
+ * @param {string} event The event name.
+ * @param {Function} fn The event handler to add.
+ * @param {boolean} opt_useCapture Optionally adds the even to the capture
+ *     phase. Note: this only works in modern browsers.
+ */
+function addEvent(node, event, fn, opt_useCapture) {
+  if (typeof node.addEventListener == 'function') {
+    node.addEventListener(event, fn, opt_useCapture || false);
+  }
+  else if (typeof node.attachEvent == 'function') {
+    node.attachEvent('on' + event, fn);
+  }
+}
+
+
+/**
+ * Removes a previously added event handler from a DOM node.
+ * @param {Node} node The DOM node to remove the event handler from.
+ * @param {string} event The event name.
+ * @param {Function} fn The event handler to remove.
+ * @param {boolean} opt_useCapture If the event handler was added with this
+ *     flag set to true, it should be set to true here in order to remove it.
+ */
+function removeEvent(node, event, fn, opt_useCapture) {
+  if (typeof node.removeEventListener == 'function') {
+    node.removeEventListener(event, fn, opt_useCapture || false);
+  }
+  else if (typeof node.detatchEvent == 'function') {
+    node.detatchEvent('on' + event, fn);
+  }
+}
+
+
+/**
+ * Returns the intersection between two rect objects.
+ * @param {Object} rect1 The first rect.
+ * @param {Object} rect2 The second rect.
+ * @return {?Object} The intersection rect or undefined if no intersection
+ *     is found.
+ */
+function computeRectIntersection(rect1, rect2) {
+  var top = Math.max(rect1.top, rect2.top);
+  var bottom = Math.min(rect1.bottom, rect2.bottom);
+  var left = Math.max(rect1.left, rect2.left);
+  var right = Math.min(rect1.right, rect2.right);
+  var width = right - left;
+  var height = bottom - top;
+
+  return (width >= 0 && height >= 0) && {
+    top: top,
+    bottom: bottom,
+    left: left,
+    right: right,
+    width: width,
+    height: height
+  };
+}
+
+
+/**
+ * Shims the native getBoundingClientRect for compatibility with older IE.
+ * @param {Element} el The element whose bounding rect to get.
+ * @return {Object} The (possibly shimmed) rect of the element.
+ */
+function getBoundingClientRect(el) {
+  var rect;
+
+  try {
+    rect = el.getBoundingClientRect();
+  } catch (err) {
+    // Ignore Windows 7 IE11 "Unspecified error"
+    // https://github.com/w3c/IntersectionObserver/pull/205
+  }
+
+  if (!rect) return getEmptyRect();
+
+  // Older IE
+  if (!(rect.width && rect.height)) {
+    rect = {
+      top: rect.top,
+      right: rect.right,
+      bottom: rect.bottom,
+      left: rect.left,
+      width: rect.right - rect.left,
+      height: rect.bottom - rect.top
+    };
+  }
+  return rect;
+}
+
+
+/**
+ * Returns an empty rect object. An empty rect is returned when an element
+ * is not in the DOM.
+ * @return {Object} The empty rect.
+ */
+function getEmptyRect() {
+  return {
+    top: 0,
+    bottom: 0,
+    left: 0,
+    right: 0,
+    width: 0,
+    height: 0
+  };
+}
+
+/**
+ * Checks to see if a parent element contains a child element (including inside
+ * shadow DOM).
+ * @param {Node} parent The parent element.
+ * @param {Node} child The child element.
+ * @return {boolean} True if the parent node contains the child node.
+ */
+function containsDeep(parent, child) {
+  var node = child;
+  while (node) {
+    if (node == parent) return true;
+
+    node = getParentNode(node);
+  }
+  return false;
+}
+
+
+/**
+ * Gets the parent node of an element or its host element if the parent node
+ * is a shadow root.
+ * @param {Node} node The node whose parent to get.
+ * @return {Node|null} The parent node or null if no parent exists.
+ */
+function getParentNode(node) {
+  var parent = node.parentNode;
+
+  if (parent && parent.nodeType == 11 && parent.host) {
+    // If the parent is a shadow root, return the host element.
+    return parent.host;
+  }
+  return parent;
+}
+
+
+// Exposes the constructors globally.
+window.IntersectionObserver = IntersectionObserver;
+window.IntersectionObserverEntry = IntersectionObserverEntry;
+
+}(window, document));

yarn.lock

@@ -1823,6 +1823,11 @@ inquirer@^7.0.0:
     strip-ansi "^6.0.0"
     through "^2.3.6"
 
+intersection-observer@^0.5.1:
+  version "0.5.1"
+  resolved "https://registry.yarnpkg.com/intersection-observer/-/intersection-observer-0.5.1.tgz#e340fc56ce74290fe2b2394d1ce88c4353ac6dfa"
+  integrity sha512-Zd7Plneq82kiXFixs7bX62YnuZ0BMRci9br7io88LwDyF3V43cQMI+G5IiTlTNTt+LsDUppl19J/M2Fp9UkH6g==
+
 is-absolute@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/is-absolute/-/is-absolute-1.0.0.tgz#395e1ae84b11f26ad1795e73c17378e48a301576"