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{"version":3,"file":"popper-utils.min.js","sources":["../../src/utils/getStyleComputedProperty.js","../../src/utils/getParentNode.js","../../src/utils/getScrollParent.js","../../src/utils/getOffsetParent.js","../../src/utils/isOffsetContainer.js","../../src/utils/getRoot.js","../../src/utils/findCommonOffsetParent.js","../../src/utils/getScroll.js","../../src/utils/includeScroll.js","../../src/utils/getBordersSize.js","../../src/utils/isIE10.js","../../src/utils/getWindowSizes.js","../../src/utils/getClientRect.js","../../src/utils/getBoundingClientRect.js","../../src/utils/getOffsetRectRelativeToArbitraryNode.js","../../src/utils/getViewportOffsetRectRelativeToArtbitraryNode.js","../../src/utils/isFixed.js","../../src/utils/getBoundaries.js","../../src/utils/computeAutoPlacement.js","../../src/utils/debounce.js","../../src/utils/find.js","../../src/utils/findIndex.js","../../src/utils/getOffsetRect.js","../../src/utils/getOuterSizes.js","../../src/utils/getOppositePlacement.js","../../src/utils/getPopperOffsets.js","../../src/utils/getReferenceOffsets.js","../../src/utils/getSupportedPropertyName.js","../../src/utils/isFunction.js","../../src/utils/isModifierEnabled.js","../../src/utils/isModifierRequired.js","../../src/utils/isNumeric.js","../../src/utils/getWindow.js","../../src/utils/removeEventListeners.js","../../src/utils/runModifiers.js","../../src/utils/setAttributes.js","../../src/utils/setStyles.js","../../src/utils/setupEventListeners.js","../../src/utils/index.js"],"sourcesContent":["/**\n * Get CSS computed property of the given element\n * @method\n * @memberof Popper.Utils\n * @argument {Eement} element\n * @argument {String} property\n */\nexport default function getStyleComputedProperty(element, property) {\n if (element.nodeType !== 1) {\n return [];\n }\n // NOTE: 1 DOM access here\n const css = getComputedStyle(element, null);\n return property ? css[property] : css;\n}\n","/**\n * Returns the parentNode or the host of the element\n * @method\n * @memberof Popper.Utils\n * @argument {Element} element\n * @returns {Element} parent\n */\nexport default function getParentNode(element) {\n if (element.nodeName === 'HTML') {\n return element;\n }\n return element.parentNode || element.host;\n}\n","import getStyleComputedProperty from './getStyleComputedProperty';\nimport getParentNode from './getParentNode';\n\n/**\n * Returns the scrolling parent of the given element\n * @method\n * @memberof Popper.Utils\n * @argument {Element} element\n * @returns {Element} scroll parent\n */\nexport default function getScrollParent(element) {\n // Return body, `getScroll` will take care to get the correct `scrollTop` from it\n if (!element) {\n return document.body\n }\n\n switch (element.nodeName) {\n case 'HTML':\n case 'BODY':\n return element.ownerDocument.body\n case '#document':\n return element.body\n }\n\n // Firefox want us to check `-x` and `-y` variations as well\n const { overflow, overflowX, overflowY } = getStyleComputedProperty(element);\n if (/(auto|scroll)/.test(overflow + overflowY + overflowX)) {\n return element;\n }\n\n return getScrollParent(getParentNode(element));\n}\n","import getStyleComputedProperty from './getStyleComputedProperty';\n/**\n * Returns the offset parent of the given element\n * @method\n * @memberof Popper.Utils\n * @argument {Element} element\n * @returns {Element} offset parent\n */\nexport default function getOffsetParent(element) {\n // NOTE: 1 DOM access here\n const offsetParent = element && element.offsetParent;\n const nodeName = offsetParent && offsetParent.nodeName;\n\n if (!nodeName || nodeName === 'BODY' || nodeName === 'HTML') {\n if (element) {\n return element.ownerDocument.documentElement\n }\n\n return document.documentElement;\n }\n\n // .offsetParent will return the closest TD or TABLE in case\n // no offsetParent is present, I hate this job...\n if (\n ['TD', 'TABLE'].indexOf(offsetParent.nodeName) !== -1 &&\n getStyleComputedProperty(offsetParent, 'position') === 'static'\n ) {\n return getOffsetParent(offsetParent);\n }\n\n return offsetParent;\n}\n","import getOffsetParent from './getOffsetParent';\n\nexport default function isOffsetContainer(element) {\n const { nodeName } = element;\n if (nodeName === 'BODY') {\n return false;\n }\n return (\n nodeName === 'HTML' || getOffsetParent(element.firstElementChild) === element\n );\n}\n","/**\n * Finds the root node (document, shadowDOM root) of the given element\n * @method\n * @memberof Popper.Utils\n * @argument {Element} node\n * @returns {Element} root node\n */\nexport default function getRoot(node) {\n if (node.parentNode !== null) {\n return getRoot(node.parentNode);\n }\n\n return node;\n}\n","import isOffsetContainer from './isOffsetContainer';\nimport getRoot from './getRoot';\nimport getOffsetParent from './getOffsetParent';\n\n/**\n * Finds the offset parent common to the two provided nodes\n * @method\n * @memberof Popper.Utils\n * @argument {Element} element1\n * @argument {Element} element2\n * @returns {Element} common offset parent\n */\nexport default function findCommonOffsetParent(element1, element2) {\n // This check is needed to avoid errors in case one of the elements isn't defined for any reason\n if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {\n return document.documentElement;\n }\n\n // Here we make sure to give as \"start\" the element that comes first in the DOM\n const order =\n element1.compareDocumentPosition(element2) &\n Node.DOCUMENT_POSITION_FOLLOWING;\n const start = order ? element1 : element2;\n const end = order ? element2 : element1;\n\n // Get common ancestor container\n const range = document.createRange();\n range.setStart(start, 0);\n range.setEnd(end, 0);\n const { commonAncestorContainer } = range;\n\n // Both nodes are inside #document\n if (\n (element1 !== commonAncestorContainer &&\n element2 !== commonAncestorContainer) ||\n start.contains(end)\n ) {\n if (isOffsetContainer(commonAncestorContainer)) {\n return commonAncestorContainer;\n }\n\n return getOffsetParent(commonAncestorContainer);\n }\n\n // one of the nodes is inside shadowDOM, find which one\n const element1root = getRoot(element1);\n if (element1root.host) {\n return findCommonOffsetParent(element1root.host, element2);\n } else {\n return findCommonOffsetParent(element1, getRoot(element2).host);\n }\n}\n","/**\n * Gets the scroll value of the given element in the given side (top and left)\n * @method\n * @memberof Popper.Utils\n * @argument {Element} element\n * @argument {String} side `top` or `left`\n * @returns {number} amount of scrolled pixels\n */\nexport default function getScroll(element, side = 'top') {\n const upperSide = side === 'top' ? 'scrollTop' : 'scrollLeft';\n const nodeName = element.nodeName;\n\n if (nodeName === 'BODY' || nodeName === 'HTML') {\n const html = element.ownerDocument.documentElement;\n const scrollingElement = element.ownerDocument.scrollingElement || html;\n return scrollingElement[upperSide];\n }\n\n return element[upperSide];\n}\n","import getScroll from './getScroll';\n\n/*\n * Sum or subtract the element scroll values (left and top) from a given rect object\n * @method\n * @memberof Popper.Utils\n * @param {Object} rect - Rect object you want to change\n * @param {HTMLElement} element - The element from the function reads the scroll values\n * @param {Boolean} subtract - set to true if you want to subtract the scroll values\n * @return {Object} rect - The modifier rect object\n */\nexport default function includeScroll(rect, element, subtract = false) {\n const scrollTop = getScroll(element, 'top');\n const scrollLeft = getScroll(element, 'left');\n const modifier = subtract ? -1 : 1;\n rect.top += scrollTop * modifier;\n rect.bottom += scrollTop * modifier;\n rect.left += scrollLeft * modifier;\n rect.right += scrollLeft * modifier;\n return rect;\n}\n","/*\n * Helper to detect borders of a given element\n * @method\n * @memberof Popper.Utils\n * @param {CSSStyleDeclaration} styles\n * Result of `getStyleComputedProperty` on the given element\n * @param {String} axis - `x` or `y`\n * @return {number} borders - The borders size of the given axis\n */\n\nexport default function getBordersSize(styles, axis) {\n const sideA = axis === 'x' ? 'Left' : 'Top';\n const sideB = sideA === 'Left' ? 'Right' : 'Bottom';\n\n return (\n parseFloat(styles[`border${sideA}Width`], 10) +\n parseFloat(styles[`border${sideB}Width`], 10)\n );\n}\n","/**\n * Tells if you are running Internet Explorer 10\n * @method\n * @memberof Popper.Utils\n * @returns {Boolean} isIE10\n */\nlet isIE10 = undefined;\n\nexport default function() {\n if (isIE10 === undefined) {\n isIE10 = navigator.appVersion.indexOf('MSIE 10') !== -1;\n }\n return isIE10;\n}\n","import isIE10 from './isIE10';\n\nfunction getSize(axis, body, html, computedStyle) {\n return Math.max(\n body[`offset${axis}`],\n body[`scroll${axis}`],\n html[`client${axis}`],\n html[`offset${axis}`],\n html[`scroll${axis}`],\n isIE10()\n ? html[`offset${axis}`] +\n computedStyle[`margin${axis === 'Height' ? 'Top' : 'Left'}`] +\n computedStyle[`margin${axis === 'Height' ? 'Bottom' : 'Right'}`]\n : 0\n );\n}\n\nexport default function getWindowSizes() {\n const body = document.body;\n const html = document.documentElement;\n const computedStyle = isIE10() && getComputedStyle(html);\n\n return {\n height: getSize('Height', body, html, computedStyle),\n width: getSize('Width', body, html, computedStyle),\n };\n}\n","/**\n * Given element offsets, generate an output similar to getBoundingClientRect\n * @method\n * @memberof Popper.Utils\n * @argument {Object} offsets\n * @returns {Object} ClientRect like output\n */\nexport default function getClientRect(offsets) {\n return {\n ...offsets,\n right: offsets.left + offsets.width,\n bottom: offsets.top + offsets.height,\n };\n}\n","import getStyleComputedProperty from './getStyleComputedProperty';\nimport getBordersSize from './getBordersSize';\nimport getWindowSizes from './getWindowSizes';\nimport getScroll from './getScroll';\nimport getClientRect from './getClientRect';\nimport isIE10 from './isIE10';\n\n/**\n * Get bounding client rect of given element\n * @method\n * @memberof Popper.Utils\n * @param {HTMLElement} element\n * @return {Object} client rect\n */\nexport default function getBoundingClientRect(element) {\n let rect = {};\n\n // IE10 10 FIX: Please, don't ask, the element isn't\n // considered in DOM in some circumstances...\n // This isn't reproducible in IE10 compatibility mode of IE11\n if (isIE10()) {\n try {\n rect = element.getBoundingClientRect();\n const scrollTop = getScroll(element, 'top');\n const scrollLeft = getScroll(element, 'left');\n rect.top += scrollTop;\n rect.left += scrollLeft;\n rect.bottom += scrollTop;\n rect.right += scrollLeft;\n } catch (err) {}\n } else {\n rect = element.getBoundingClientRect();\n }\n\n const result = {\n left: rect.left,\n top: rect.top,\n width: rect.right - rect.left,\n height: rect.bottom - rect.top,\n };\n\n // subtract scrollbar size from sizes\n const sizes = element.nodeName === 'HTML' ? getWindowSizes() : {};\n const width =\n sizes.width || element.clientWidth || result.right - result.left;\n const height =\n sizes.height || element.clientHeight || result.bottom - result.top;\n\n let horizScrollbar = element.offsetWidth - width;\n let vertScrollbar = element.offsetHeight - height;\n\n // if an hypothetical scrollbar is detected, we must be sure it's not a `border`\n // we make this check conditional for performance reasons\n if (horizScrollbar || vertScrollbar) {\n const styles = getStyleComputedProperty(element);\n horizScrollbar -= getBordersSize(styles, 'x');\n vertScrollbar -= getBordersSize(styles, 'y');\n\n result.width -= horizScrollbar;\n result.height -= vertScrollbar;\n }\n\n return getClientRect(result);\n}\n","import getStyleComputedProperty from './getStyleComputedProperty';\nimport includeScroll from './includeScroll';\nimport getScrollParent from './getScrollParent';\nimport getBoundingClientRect from './getBoundingClientRect';\nimport runIsIE10 from './isIE10';\nimport getClientRect from './getClientRect';\n\nexport default function getOffsetRectRelativeToArbitraryNode(children, parent) {\n const isIE10 = runIsIE10();\n const isHTML = parent.nodeName === 'HTML';\n const childrenRect = getBoundingClientRect(children);\n const parentRect = getBoundingClientRect(parent);\n const scrollParent = getScrollParent(children);\n\n const styles = getStyleComputedProperty(parent);\n const borderTopWidth = parseFloat(styles.borderTopWidth, 10);\n const borderLeftWidth = parseFloat(styles.borderLeftWidth, 10);\n\n let offsets = getClientRect({\n top: childrenRect.top - parentRect.top - borderTopWidth,\n left: childrenRect.left - parentRect.left - borderLeftWidth,\n width: childrenRect.width,\n height: childrenRect.height,\n });\n offsets.marginTop = 0;\n offsets.marginLeft = 0;\n\n // Subtract margins of documentElement in case it's being used as parent\n // we do this only on HTML because it's the only element that behaves\n // differently when margins are applied to it. The margins are included in\n // the box of the documentElement, in the other cases not.\n if (!isIE10 && isHTML) {\n const marginTop = parseFloat(styles.marginTop, 10);\n const marginLeft = parseFloat(styles.marginLeft, 10);\n\n offsets.top -= borderTopWidth - marginTop;\n offsets.bottom -= borderTopWidth - marginTop;\n offsets.left -= borderLeftWidth - marginLeft;\n offsets.right -= borderLeftWidth - marginLeft;\n\n // Attach marginTop and marginLeft because in some circumstances we may need them\n offsets.marginTop = marginTop;\n offsets.marginLeft = marginLeft;\n }\n\n if (\n isIE10\n ? parent.contains(scrollParent)\n : parent === scrollParent && scrollParent.nodeName !== 'BODY'\n ) {\n offsets = includeScroll(offsets, parent);\n }\n\n return offsets;\n}\n","import getOffsetRectRelativeToArbitraryNode from './getOffsetRectRelativeToArbitraryNode';\nimport getScroll from './getScroll';\nimport getClientRect from './getClientRect';\n\nexport default function getViewportOffsetRectRelativeToArtbitraryNode(element) {\n const html = element.ownerDocument.documentElement;\n const relativeOffset = getOffsetRectRelativeToArbitraryNode(element, html);\n const width = Math.max(html.clientWidth, window.innerWidth || 0);\n const height = Math.max(html.clientHeight, window.innerHeight || 0);\n\n const scrollTop = getScroll(html);\n const scrollLeft = getScroll(html, 'left');\n\n const offset = {\n top: scrollTop - relativeOffset.top + relativeOffset.marginTop,\n left: scrollLeft - relativeOffset.left + relativeOffset.marginLeft,\n width,\n height,\n };\n\n return getClientRect(offset);\n}\n","import getStyleComputedProperty from './getStyleComputedProperty';\nimport getParentNode from './getParentNode';\n\n/**\n * Check if the given element is fixed or is inside a fixed parent\n * @method\n * @memberof Popper.Utils\n * @argument {Element} element\n * @argument {Element} customContainer\n * @returns {Boolean} answer to \"isFixed?\"\n */\nexport default function isFixed(element) {\n const nodeName = element.nodeName;\n if (nodeName === 'BODY' || nodeName === 'HTML') {\n return false;\n }\n if (getStyleComputedProperty(element, 'position') === 'fixed') {\n return true;\n }\n return isFixed(getParentNode(element));\n}\n","import getScrollParent from './getScrollParent';\nimport getParentNode from './getParentNode';\nimport findCommonOffsetParent from './findCommonOffsetParent';\nimport getOffsetRectRelativeToArbitraryNode from './getOffsetRectRelativeToArbitraryNode';\nimport getViewportOffsetRectRelativeToArtbitraryNode from './getViewportOffsetRectRelativeToArtbitraryNode';\nimport getWindowSizes from './getWindowSizes';\nimport isFixed from './isFixed';\n\n/**\n * Computed the boundaries limits and return them\n * @method\n * @memberof Popper.Utils\n * @param {HTMLElement} popper\n * @param {HTMLElement} reference\n * @param {number} padding\n * @param {HTMLElement} boundariesElement - Element used to define the boundaries\n * @returns {Object} Coordinates of the boundaries\n */\nexport default function getBoundaries(\n popper,\n reference,\n padding,\n boundariesElement\n) {\n // NOTE: 1 DOM access here\n let boundaries = { top: 0, left: 0 };\n const offsetParent = findCommonOffsetParent(popper, reference);\n\n // Handle viewport case\n if (boundariesElement === 'viewport') {\n boundaries = getViewportOffsetRectRelativeToArtbitraryNode(offsetParent);\n } else {\n // Handle other cases based on DOM element used as boundaries\n let boundariesNode;\n if (boundariesElement === 'scrollParent') {\n boundariesNode = getScrollParent(getParentNode(reference));\n if (boundariesNode.nodeName === 'BODY') {\n boundariesNode = popper.ownerDocument.documentElement;\n }\n } else if (boundariesElement === 'window') {\n boundariesNode = popper.ownerDocument.documentElement;\n } else {\n boundariesNode = boundariesElement;\n }\n\n const offsets = getOffsetRectRelativeToArbitraryNode(\n boundariesNode,\n offsetParent\n );\n\n // In case of HTML, we need a different computation\n if (boundariesNode.nodeName === 'HTML' && !isFixed(offsetParent)) {\n const { height, width } = getWindowSizes();\n boundaries.top += offsets.top - offsets.marginTop;\n boundaries.bottom = height + offsets.top;\n boundaries.left += offsets.left - offsets.marginLeft;\n boundaries.right = width + offsets.left;\n } else {\n // for all the other DOM elements, this one is good\n boundaries = offsets;\n }\n }\n\n // Add paddings\n boundaries.left += padding;\n boundaries.top += padding;\n boundaries.right -= padding;\n boundaries.bottom -= padding;\n\n return boundaries;\n}\n","import getBoundaries from '../utils/getBoundaries';\n\nfunction getArea({ width, height }) {\n return width * height;\n}\n\n/**\n * Utility used to transform the `auto` placement to the placement with more\n * available space.\n * @method\n * @memberof Popper.Utils\n * @argument {Object} data - The data object generated by update method\n * @argument {Object} options - Modifiers configuration and options\n * @returns {Object} The data object, properly modified\n */\nexport default function computeAutoPlacement(\n placement,\n refRect,\n popper,\n reference,\n boundariesElement,\n padding = 0\n) {\n if (placement.indexOf('auto') === -1) {\n return placement;\n }\n\n const boundaries = getBoundaries(\n popper,\n reference,\n padding,\n boundariesElement\n );\n\n const rects = {\n top: {\n width: boundaries.width,\n height: refRect.top - boundaries.top,\n },\n right: {\n width: boundaries.right - refRect.right,\n height: boundaries.height,\n },\n bottom: {\n width: boundaries.width,\n height: boundaries.bottom - refRect.bottom,\n },\n left: {\n width: refRect.left - boundaries.left,\n height: boundaries.height,\n },\n };\n\n const sortedAreas = Object.keys(rects)\n .map(key => ({\n key,\n ...rects[key],\n area: getArea(rects[key]),\n }))\n .sort((a, b) => b.area - a.area);\n\n const filteredAreas = sortedAreas.filter(\n ({ width, height }) =>\n width >= popper.clientWidth && height >= popper.clientHeight\n );\n\n const computedPlacement = filteredAreas.length > 0\n ? filteredAreas[0].key\n : sortedAreas[0].key;\n\n const variation = placement.split('-')[1];\n\n return computedPlacement + (variation ? `-${variation}` : '');\n}\n","const isBrowser = typeof window !== 'undefined' && typeof document !== 'undefined';\nconst longerTimeoutBrowsers = ['Edge', 'Trident', 'Firefox'];\nlet timeoutDuration = 0;\nfor (let i = 0; i < longerTimeoutBrowsers.length; i += 1) {\n if (isBrowser && navigator.userAgent.indexOf(longerTimeoutBrowsers[i]) >= 0) {\n timeoutDuration = 1;\n break;\n }\n}\n\nexport function microtaskDebounce(fn) {\n let called = false\n return () => {\n if (called) {\n return\n }\n called = true\n window.Promise.resolve().then(() => {\n called = false\n fn()\n })\n }\n}\n\nexport function taskDebounce(fn) {\n let scheduled = false;\n return () => {\n if (!scheduled) {\n scheduled = true;\n setTimeout(() => {\n scheduled = false;\n fn();\n }, timeoutDuration);\n }\n };\n}\n\nconst supportsMicroTasks = isBrowser && window.Promise\n\n\n/**\n* Create a debounced version of a method, that's asynchronously deferred\n* but called in the minimum time possible.\n*\n* @method\n* @memberof Popper.Utils\n* @argument {Function} fn\n* @returns {Function}\n*/\nexport default (supportsMicroTasks\n ? microtaskDebounce\n : taskDebounce);\n","/**\n * Mimics the `find` method of Array\n * @method\n * @memberof Popper.Utils\n * @argument {Array} arr\n * @argument prop\n * @argument value\n * @returns index or -1\n */\nexport default function find(arr, check) {\n // use native find if supported\n if (Array.prototype.find) {\n return arr.find(check);\n }\n\n // use `filter` to obtain the same behavior of `find`\n return arr.filter(check)[0];\n}\n","import find from './find';\n\n/**\n * Return the index of the matching object\n * @method\n * @memberof Popper.Utils\n * @argument {Array} arr\n * @argument prop\n * @argument value\n * @returns index or -1\n */\nexport default function findIndex(arr, prop, value) {\n // use native findIndex if supported\n if (Array.prototype.findIndex) {\n return arr.findIndex(cur => cur[prop] === value);\n }\n\n // use `find` + `indexOf` if `findIndex` isn't supported\n const match = find(arr, obj => obj[prop] === value);\n return arr.indexOf(match);\n}\n","import getWindowSizes from './getWindowSizes';\nimport getClientRect from './getClientRect';\n\n/**\n * Get the position of the given element, relative to its offset parent\n * @method\n * @memberof Popper.Utils\n * @param {Element} element\n * @return {Object} position - Coordinates of the element and its `scrollTop`\n */\nexport default function getOffsetRect(element) {\n let elementRect;\n if (element.nodeName === 'HTML') {\n const { width, height } = getWindowSizes();\n elementRect = {\n width,\n height,\n left: 0,\n top: 0,\n };\n } else {\n elementRect = {\n width: element.offsetWidth,\n height: element.offsetHeight,\n left: element.offsetLeft,\n top: element.offsetTop,\n };\n }\n\n // position\n return getClientRect(elementRect);\n}\n","/**\n * Get the outer sizes of the given element (offset size + margins)\n * @method\n * @memberof Popper.Utils\n * @argument {Element} element\n * @returns {Object} object containing width and height properties\n */\nexport default function getOuterSizes(element) {\n const styles = getComputedStyle(element);\n const x = parseFloat(styles.marginTop) + parseFloat(styles.marginBottom);\n const y = parseFloat(styles.marginLeft) + parseFloat(styles.marginRight);\n const result = {\n width: element.offsetWidth + y,\n height: element.offsetHeight + x,\n };\n return result;\n}\n","/**\n * Get the opposite placement of the given one\n * @method\n * @memberof Popper.Utils\n * @argument {String} placement\n * @returns {String} flipped placement\n */\nexport default function getOppositePlacement(placement) {\n const hash = { left: 'right', right: 'left', bottom: 'top', top: 'bottom' };\n return placement.replace(/left|right|bottom|top/g, matched => hash[matched]);\n}\n","import getOuterSizes from './getOuterSizes';\nimport getOppositePlacement from './getOppositePlacement';\n\n/**\n * Get offsets to the popper\n * @method\n * @memberof Popper.Utils\n * @param {Object} position - CSS position the Popper will get applied\n * @param {HTMLElement} popper - the popper element\n * @param {Object} referenceOffsets - the reference offsets (the popper will be relative to this)\n * @param {String} placement - one of the valid placement options\n * @returns {Object} popperOffsets - An object containing the offsets which will be applied to the popper\n */\nexport default function getPopperOffsets(popper, referenceOffsets, placement) {\n placement = placement.split('-')[0];\n\n // Get popper node sizes\n const popperRect = getOuterSizes(popper);\n\n // Add position, width and height to our offsets object\n const popperOffsets = {\n width: popperRect.width,\n height: popperRect.height,\n };\n\n // depending by the popper placement we have to compute its offsets slightly differently\n const isHoriz = ['right', 'left'].indexOf(placement) !== -1;\n const mainSide = isHoriz ? 'top' : 'left';\n const secondarySide = isHoriz ? 'left' : 'top';\n const measurement = isHoriz ? 'height' : 'width';\n const secondaryMeasurement = !isHoriz ? 'height' : 'width';\n\n popperOffsets[mainSide] =\n referenceOffsets[mainSide] +\n referenceOffsets[measurement] / 2 -\n popperRect[measurement] / 2;\n if (placement === secondarySide) {\n popperOffsets[secondarySide] =\n referenceOffsets[secondarySide] - popperRect[secondaryMeasurement];\n } else {\n popperOffsets[secondarySide] =\n referenceOffsets[getOppositePlacement(secondarySide)];\n }\n\n return popperOffsets;\n}\n","import findCommonOffsetParent from './findCommonOffsetParent';\nimport getOffsetRectRelativeToArbitraryNode from './getOffsetRectRelativeToArbitraryNode';\n\n/**\n * Get offsets to the reference element\n * @method\n * @memberof Popper.Utils\n * @param {Object} state\n * @param {Element} popper - the popper element\n * @param {Element} reference - the reference element (the popper will be relative to this)\n * @returns {Object} An object containing the offsets which will be applied to the popper\n */\nexport default function getReferenceOffsets(state, popper, reference) {\n const commonOffsetParent = findCommonOffsetParent(popper, reference);\n return getOffsetRectRelativeToArbitraryNode(reference, commonOffsetParent);\n}\n","/**\n * Get the prefixed supported property name\n * @method\n * @memberof Popper.Utils\n * @argument {String} property (camelCase)\n * @returns {String} prefixed property (camelCase or PascalCase, depending on the vendor prefix)\n */\nexport default function getSupportedPropertyName(property) {\n const prefixes = [false, 'ms', 'Webkit', 'Moz', 'O'];\n const upperProp = property.charAt(0).toUpperCase() + property.slice(1);\n\n for (let i = 0; i < prefixes.length - 1; i++) {\n const prefix = prefixes[i];\n const toCheck = prefix ? `${prefix}${upperProp}` : property;\n if (typeof document.body.style[toCheck] !== 'undefined') {\n return toCheck;\n }\n }\n return null;\n}\n","/**\n * Check if the given variable is a function\n * @method\n * @memberof Popper.Utils\n * @argument {Any} functionToCheck - variable to check\n * @returns {Boolean} answer to: is a function?\n */\nexport default function isFunction(functionToCheck) {\n const getType = {};\n return (\n functionToCheck &&\n getType.toString.call(functionToCheck) === '[object Function]'\n );\n}\n","/**\n * Helper used to know if the given modifier is enabled.\n * @method\n * @memberof Popper.Utils\n * @returns {Boolean}\n */\nexport default function isModifierEnabled(modifiers, modifierName) {\n return modifiers.some(\n ({ name, enabled }) => enabled && name === modifierName\n );\n}\n","import find from './find';\n\n/**\n * Helper used to know if the given modifier depends from another one.
