index.js

/**
 * --------------------------------------------------------------------------
 * Bootstrap (v4.3.1): 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 => ({}.toString.call(obj).match(/\s([a-z]+)/i)[1].toLowerCase())

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

const getUID = prefix => {
  do {
    prefix += ~~(Math.random() * MAX_UID) // "~~" acts like a faster Math.floor() here
  } 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)