# All files / src/util index.js

92.94% Statements 79/85
89.66% Branches 52/58
100% Functions 19/19
92.68% Lines 76/82

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     /**
     * --------------------------------------------------------------------------
     * Bootstrap (v5.0.0-alpha1): util/index.js
     * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
     * --------------------------------------------------------------------------
     */

    const MAX_UID = 1000000
    const MILLISECONDS_MULTIPLIER = 1000
    const TRANSITION_END = 'transitionend'

    // Shoutout AngusCroll (https://goo.gl/pxwQGp)
    const toType = obj => {
      if (obj === null || obj === undefined) {
        return `${obj}`
      }

      return {}.toString.call(obj).match(/\s([a-z]+)/i)[1].toLowerCase()
    }

    /**
     * --------------------------------------------------------------------------
     * Public Util Api
     * --------------------------------------------------------------------------
     */

    const getUID = prefix => {
      do {
        prefix += Math.floor(Math.random() * MAX_UID)
      } while (document.getElementById(prefix))

      return prefix
    }

    const getSelector = element => {
      let selector = element.getAttribute('data-target')

      if (!selector || selector === '#') {
        const hrefAttr = element.getAttribute('href')

        selector = hrefAttr && hrefAttr !== '#' ? hrefAttr.trim() : null
      }

      return selector
    }

    const getSelectorFromElement = element => {
      const selector = getSelector(element)

      if (selector) {
        return document.querySelector(selector) ? selector : null
      }

      return null
    }

    const getElementFromSelector = element => {
      const selector = getSelector(element)

      return selector ? document.querySelector(selector) : null
    }

    const getTransitionDurationFromElement = element => {
      if (!element) {
        return 0
      }

      // Get transition-duration of the element
      let {
        transitionDuration,
        transitionDelay
      } = window.getComputedStyle(element)

      const floatTransitionDuration = parseFloat(transitionDuration)
      const floatTransitionDelay = parseFloat(transitionDelay)

      // Return 0 if element or transition duration is not found
      if (!floatTransitionDuration && !floatTransitionDelay) {
        return 0
      }

      // If multiple durations are defined, take the first
      transitionDuration = transitionDuration.split(',')[0]
      transitionDelay = transitionDelay.split(',')[0]

      return (parseFloat(transitionDuration) + parseFloat(transitionDelay)) * MILLISECONDS_MULTIPLIER
    }

    const triggerTransitionEnd = element => {
      element.dispatchEvent(new Event(TRANSITION_END))
    }

    const isElement = obj => (obj[0] || obj).nodeType

    const emulateTransitionEnd = (element, duration) => {
      let called = false
      const durationPadding = 5
      const emulatedDuration = duration + durationPadding
      function listener() {
        called = true
        element.removeEventListener(TRANSITION_END, listener)
      }

      element.addEventListener(TRANSITION_END, listener)
      setTimeout(() => {
        if (!called) {
          triggerTransitionEnd(element)
        }
      }, emulatedDuration)
    }

    const typeCheckConfig = (componentName, config, configTypes) => {
      Object.keys(configTypes)
        .forEach(property => {
          const expectedTypes = configTypes[property]
          const value = config[property]
          const valueType = value && isElement(value) ?
            'element' :
            toType(value)

          if (!new RegExp(expectedTypes).test(valueType)) {
            throw new Error(
              `${componentName.toUpperCase()}: ` +
              `Option "${property}" provided type "${valueType}" ` +
              `but expected type "${expectedTypes}".`)
          }
        })
    }

    const isVisible = element => {
      if (!element) {
        return false
      }

      if (element.style && element.parentNode && element.parentNode.style) {
        const elementStyle = getComputedStyle(element)
        const parentNodeStyle = getComputedStyle(element.parentNode)

        return elementStyle.display !== 'none' &&
          parentNodeStyle.display !== 'none' &&
          elementStyle.visibility !== 'hidden'
      }

      return false
    }

    const findShadowRoot = element => {
      Iif (!document.documentElement.attachShadow) {
        return null
      }

      // Can find the shadow root otherwise it'll return the document
      Eif (typeof element.getRootNode === 'function') {
        const root = element.getRootNode()
        return root instanceof ShadowRoot ? root : null
      }

      if (element instanceof ShadowRoot) {
        return element
      }

      // when we don't find a shadow root
      if (!element.parentNode) {
        return null
      }

      return findShadowRoot(element.parentNode)
    }

    const noop = () => function () {}

    const reflow = element => element.offsetHeight

    const getjQuery = () => {
      const { jQuery } = window

      if (jQuery && !document.body.hasAttribute('data-no-jquery')) {
        return jQuery
      }

      return null
    }

    export {
      getjQuery,
      TRANSITION_END,
      getUID,
      getSelectorFromElement,
      getElementFromSelector,
      getTransitionDurationFromElement,
      triggerTransitionEnd,
      isElement,
      emulateTransitionEnd,
      typeCheckConfig,
      isVisible,
      findShadowRoot,
      noop,
      reflow
    }