Comply to the new rules.

12 files changed, 196 insertions, 337 deletions

diff --git a/js/src/alert.js b/js/src/alert.js
index 9f17d5ed0..147701bfe 100644
--- a/js/src/alert.js
+++ b/js/src/alert.js
@@ -1,7 +1,6 @@
 import $ from 'jquery'
 import Util from './util'
 
-
 /**
  * --------------------------------------------------------------------------
  * Bootstrap (v4.0.0-beta.3): alert.js
@@ -10,8 +9,6 @@ import Util from './util'
  */
 
 const Alert = (($) => {
-
-
   /**
    * ------------------------------------------------------------------------
    * Constants
@@ -42,7 +39,6 @@ const Alert = (($) => {
     SHOW  : 'show'
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Class Definition
@@ -50,20 +46,17 @@ const Alert = (($) => {
    */
 
   class Alert {
-
     constructor(element) {
       this._element = element
     }
 
-
-    // getters
+    // Getters
 
     static get VERSION() {
       return VERSION
     }
 
-
-    // public
+    // Public
 
     close(element) {
       element = element || this._element
@@ -83,8 +76,7 @@ const Alert = (($) => {
       this._element = null
     }
 
-
-    // private
+    // Private
 
     _getRootElement(element) {
       const selector = Util.getSelectorFromElement(element)
@@ -129,8 +121,7 @@ const Alert = (($) => {
         .remove()
     }
 
-
-    // static
+    // Static
 
     static _jQueryInterface(config) {
       return this.each(function () {
@@ -157,10 +148,8 @@ const Alert = (($) => {
         alertInstance.close(this)
       }
     }
-
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Data Api implementation
@@ -173,7 +162,6 @@ const Alert = (($) => {
     Alert._handleDismiss(new Alert())
   )
 
-
   /**
    * ------------------------------------------------------------------------
    * jQuery
@@ -188,7 +176,6 @@ const Alert = (($) => {
   }
 
   return Alert
-
 })($)
 
 export default Alert
diff --git a/js/src/button.js b/js/src/button.js
index 56688e246..445e78938 100644
--- a/js/src/button.js
+++ b/js/src/button.js
@@ -8,8 +8,6 @@ import $ from 'jquery'
  */
 
 const Button = (($) => {
-
-
   /**
    * ------------------------------------------------------------------------
    * Constants
@@ -39,11 +37,10 @@ const Button = (($) => {
 
   const Event = {
     CLICK_DATA_API      : `click${EVENT_KEY}${DATA_API_KEY}`,
-    FOCUS_BLUR_DATA_API : `focus${EVENT_KEY}${DATA_API_KEY} `
-                        + `blur${EVENT_KEY}${DATA_API_KEY}`
+    FOCUS_BLUR_DATA_API : `focus${EVENT_KEY}${DATA_API_KEY} ` +
+                            `blur${EVENT_KEY}${DATA_API_KEY}`
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Class Definition
@@ -51,25 +48,22 @@ const Button = (($) => {
    */
 
   class Button {
-
     constructor(element) {
       this._element = element
     }
 
-
-    // getters
+    // Getters
 
     static get VERSION() {
       return VERSION
     }
 
-
-    // public
+    // Public
 
     toggle() {
       let triggerChangeEvent = true
       let addAriaPressed = true
-      const rootElement      = $(this._element).closest(
+      const rootElement = $(this._element).closest(
         Selector.DATA_TOGGLE
       )[0]
 
@@ -81,7 +75,6 @@ const Button = (($) => {
             if (input.checked &&
               $(this._element).hasClass(ClassName.ACTIVE)) {
               triggerChangeEvent = false
-
             } else {
               const activeElement = $(rootElement).find(Selector.ACTIVE)[0]
 
@@ -105,7 +98,6 @@ const Button = (($) => {
           input.focus()
           addAriaPressed = false
         }
-
       }
 
       if (addAriaPressed) {
@@ -123,8 +115,7 @@ const Button = (($) => {
       this._element = null
     }
 
-
-    // static
+    // Static
 
     static _jQueryInterface(config) {
       return this.each(function () {
@@ -140,10 +131,8 @@ const Button = (($) => {
         }
       })
     }
-
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Data Api implementation
@@ -167,22 +156,20 @@ const Button = (($) => {
       $(button).toggleClass(ClassName.FOCUS, /^focus(in)?$/.test(event.type))
     })
 
-
   /**
    * ------------------------------------------------------------------------
    * jQuery
    * ------------------------------------------------------------------------
    */
 
-  $.fn[NAME]             = Button._jQueryInterface
+  $.fn[NAME] = Button._jQueryInterface
   $.fn[NAME].Constructor = Button
-  $.fn[NAME].noConflict  = function () {
+  $.fn[NAME].noConflict = function () {
     $.fn[NAME] = JQUERY_NO_CONFLICT
     return Button._jQueryInterface
   }
 
   return Button
-
 })($)
 
 export default Button
diff --git a/js/src/carousel.js b/js/src/carousel.js
index 083f2548e..895d4dd3b 100644
--- a/js/src/carousel.js
+++ b/js/src/carousel.js
@@ -1,7 +1,6 @@
 import $ from 'jquery'
 import Util from './util'
 
-
 /**
  * --------------------------------------------------------------------------
  * Bootstrap (v4.0.0-beta.3): carousel.js
@@ -10,8 +9,6 @@ import Util from './util'
  */
 
 const Carousel = (($) => {
-
-
   /**
    * ------------------------------------------------------------------------
    * Constants
@@ -84,7 +81,6 @@ const Carousel = (($) => {
     DATA_RIDE   : '[data-ride="carousel"]'
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Class Definition
@@ -92,7 +88,6 @@ const Carousel = (($) => {
    */
 
   class Carousel {
-
     constructor(element, config) {
       this._items             = null
       this._interval          = null
@@ -110,8 +105,7 @@ const Carousel = (($) => {
       this._addEventListeners()
     }
 
-
-    // getters
+    // Getters
 
     static get VERSION() {
       return VERSION
@@ -121,8 +115,7 @@ const Carousel = (($) => {
       return Default
     }
 
-
-    // public
+    // Public
 
     next() {
       if (!this._isSliding) {
@@ -198,9 +191,9 @@ const Carousel = (($) => {
         return
       }
 
-      const direction = index > activeIndex ?
-        Direction.NEXT :
-        Direction.PREV
+      const direction = index > activeIndex
+        ? Direction.NEXT
+        : Direction.PREV
 
       this._slide(direction, this._items[index])
     }
@@ -219,8 +212,7 @@ const Carousel = (($) => {
       this._indicatorsElement = null
     }
 
-
-    // private
+    // Private
 
     _getConfig(config) {
       config = {
@@ -242,7 +234,7 @@ const Carousel = (($) => {
           .on(Event.MOUSEENTER, (event) => this.pause(event))
           .on(Event.MOUSELEAVE, (event) => this.cycle(event))
         if ('ontouchstart' in document.documentElement) {
-          // if it's a touch-enabled device, mouseenter/leave are fired as
+          // If it's a touch-enabled device, mouseenter/leave are fired as
           // part of the mouse compatibility events on first tap - the carousel
           // would stop cycling until user tapped out of it;
           // here, we listen for touchend, explicitly pause the carousel
@@ -275,7 +267,6 @@ const Carousel = (($) => {
           this.next()
           break
         default:
-          return
       }
     }
 
@@ -299,11 +290,10 @@ const Carousel = (($) => {
       const delta     = direction === Direction.PREV ? -1 : 1
       const itemIndex = (activeIndex + delta) % this._items.length
 
-      return itemIndex === -1 ?
-        this._items[this._items.length - 1] : this._items[itemIndex]
+      return itemIndex === -1
+        ? this._items[this._items.length - 1] : this._items[itemIndex]
     }
 
-
     _triggerSlideEvent(relatedTarget, eventDirectionName) {
       const targetIndex = this._getItemIndex(relatedTarget)
       const fromIndex = this._getItemIndex($(this._element).find(Selector.ACTIVE_ITEM)[0])
@@ -368,7 +358,7 @@ const Carousel = (($) => {
       }
 
       if (!activeElement || !nextElement) {
-        // some weirdness is happening, so we bail
+        // Some weirdness is happening, so we bail
         return
       }
 
@@ -389,7 +379,6 @@ const Carousel = (($) => {
 
       if (Util.supportsTransitionEnd() &&
         $(this._element).hasClass(ClassName.SLIDE)) {
-
         $(nextElement).addClass(orderClassName)
 
         Util.reflow(nextElement)
@@ -408,10 +397,8 @@ const Carousel = (($) => {
             this._isSliding = false
 
             setTimeout(() => $(this._element).trigger(slidEvent), 0)
-
           })
           .emulateTransitionEnd(TRANSITION_DURATION)
-
       } else {
         $(activeElement).removeClass(ClassName.ACTIVE)
         $(nextElement).addClass(ClassName.ACTIVE)
@@ -425,12 +412,11 @@ const Carousel = (($) => {
       }
     }
 
-
-    // static
+    // Static
 
     static _jQueryInterface(config) {
       return this.each(function () {
-        let data      = $(this).data(DATA_KEY)
+        let data = $(this).data(DATA_KEY)
         let _config = {
           ...Default,
           ...$(this).data()
@@ -454,7 +440,7 @@ const Carousel = (($) => {
           data.to(config)
         } else if (typeof action === 'string') {
           if (typeof data[action] === 'undefined') {
-            throw new Error(`No method named "${action}"`)
+            throw new TypeError(`No method named "${action}"`)
           }
           data[action]()
         } else if (_config.interval) {
@@ -495,10 +481,8 @@ const Carousel = (($) => {
 
       event.preventDefault()
     }
-
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Data Api implementation
@@ -515,22 +499,20 @@ const Carousel = (($) => {
     })
   })
 
-
   /**
    * ------------------------------------------------------------------------
    * jQuery
    * ------------------------------------------------------------------------
    */
 
-  $.fn[NAME]             = Carousel._jQueryInterface
+  $.fn[NAME] = Carousel._jQueryInterface
   $.fn[NAME].Constructor = Carousel
-  $.fn[NAME].noConflict  = function () {
+  $.fn[NAME].noConflict = function () {
     $.fn[NAME] = JQUERY_NO_CONFLICT
     return Carousel._jQueryInterface
   }
 
   return Carousel
-
 })($)
 
 export default Carousel
diff --git a/js/src/collapse.js b/js/src/collapse.js
index b0c17112c..eaaf155e1 100644
--- a/js/src/collapse.js
+++ b/js/src/collapse.js
@@ -1,7 +1,6 @@
 import $ from 'jquery'
 import Util from './util'
 
-
 /**
  * --------------------------------------------------------------------------
  * Bootstrap (v4.0.0-beta.3): collapse.js
@@ -10,8 +9,6 @@ import Util from './util'
  */
 
 const Collapse = (($) => {
-
-
   /**
    * ------------------------------------------------------------------------
    * Constants
@@ -61,7 +58,6 @@ const Collapse = (($) => {
     DATA_TOGGLE : '[data-toggle="collapse"]'
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Class Definition
@@ -69,7 +65,6 @@ const Collapse = (($) => {
    */
 
   class Collapse {
-
     constructor(element, config) {
       this._isTransitioning = false
       this._element         = element
@@ -99,8 +94,7 @@ const Collapse = (($) => {
       }
     }
 
-
-    // getters
+    // Getters
 
     static get VERSION() {
       return VERSION
@@ -110,8 +104,7 @@ const Collapse = (($) => {
       return Default
     }
 
-
-    // public
+    // Public
 
     toggle() {
       if ($(this._element).hasClass(ClassName.SHOW)) {
@@ -136,7 +129,7 @@ const Collapse = (($) => {
             .find(Selector.ACTIVES)
             .filter(`[data-parent="${this._config.parent}"]`)
         )
-        if (!actives.length) {
+        if (actives.length === 0) {
           actives = null
         }
       }
@@ -169,7 +162,7 @@ const Collapse = (($) => {
 
       this._element.style[dimension] = 0
 
-      if (this._triggerArray.length) {
+      if (this._triggerArray.length > 0) {
         $(this._triggerArray)
           .removeClass(ClassName.COLLAPSED)
           .attr('aria-expanded', true)
@@ -196,7 +189,7 @@ const Collapse = (($) => {
       }
 
       const capitalizedDimension = dimension[0].toUpperCase() + dimension.slice(1)
-      const scrollSize           = `scroll${capitalizedDimension}`
+      const scrollSize = `scroll${capitalizedDimension}`
 
       $(this._element)
         .one(Util.TRANSITION_END, complete)
@@ -217,7 +210,7 @@ const Collapse = (($) => {
         return
       }
 
-      const dimension       = this._getDimension()
+      const dimension = this._getDimension()
 
       this._element.style[dimension] = `${this._element.getBoundingClientRect()[dimension]}px`
 
@@ -228,7 +221,7 @@ const Collapse = (($) => {
         .removeClass(ClassName.COLLAPSE)
         .removeClass(ClassName.SHOW)
 
-      if (this._triggerArray.length) {
+      if (this._triggerArray.length > 0) {
         for (let i = 0; i < this._triggerArray.length; i++) {
           const trigger = this._triggerArray[i]
           const selector = Util.getSelectorFromElement(trigger)
@@ -236,7 +229,7 @@ const Collapse = (($) => {
             const $elem = $(selector)
             if (!$elem.hasClass(ClassName.SHOW)) {
               $(trigger).addClass(ClassName.COLLAPSED)
-                   .attr('aria-expanded', false)
+                .attr('aria-expanded', false)
             }
           }
         }
@@ -278,15 +271,14 @@ const Collapse = (($) => {
       this._isTransitioning = null
     }
 
-
-    // private
+    // Private
 
     _getConfig(config) {
       config = {
         ...Default,
         ...config
       }
-      config.toggle = Boolean(config.toggle) // coerce string values
+      config.toggle = Boolean(config.toggle) // Coerce string values
       Util.typeCheckConfig(NAME, config, DefaultType)
       return config
     }
@@ -301,7 +293,7 @@ const Collapse = (($) => {
       if (Util.isElement(this._config.parent)) {
         parent = this._config.parent
 
-        // it's a jQuery object
+        // It's a jQuery object
         if (typeof this._config.parent.jquery !== 'undefined') {
           parent = this._config.parent[0]
         }
@@ -326,7 +318,7 @@ const Collapse = (($) => {
       if (element) {
         const isOpen = $(element).hasClass(ClassName.SHOW)
 
-        if (triggerArray.length) {
+        if (triggerArray.length > 0) {
           $(triggerArray)
             .toggleClass(ClassName.COLLAPSED, !isOpen)
             .attr('aria-expanded', isOpen)
@@ -334,8 +326,7 @@ const Collapse = (($) => {
       }
     }
 
-
-    // static
+    // Static
 
     static _getTargetFromElement(element) {
       const selector = Util.getSelectorFromElement(element)
@@ -363,16 +354,14 @@ const Collapse = (($) => {
 
         if (typeof config === 'string') {
           if (typeof data[config] === 'undefined') {
-            throw new Error(`No method named "${config}"`)
+            throw new TypeError(`No method named "${config}"`)
           }
           data[config]()
         }
       })
     }
-
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Data Api implementation
@@ -395,22 +384,20 @@ const Collapse = (($) => {
     })
   })
 
-
   /**
    * ------------------------------------------------------------------------
    * jQuery
    * ------------------------------------------------------------------------
    */
 
-  $.fn[NAME]             = Collapse._jQueryInterface
+  $.fn[NAME] = Collapse._jQueryInterface
   $.fn[NAME].Constructor = Collapse
-  $.fn[NAME].noConflict  = function () {
+  $.fn[NAME].noConflict = function () {
     $.fn[NAME] = JQUERY_NO_CONFLICT
     return Collapse._jQueryInterface
   }
 
   return Collapse
-
 })($)
 
 export default Collapse
diff --git a/js/src/dropdown.js b/js/src/dropdown.js
index a2505c0b5..863f7812e 100644
--- a/js/src/dropdown.js
+++ b/js/src/dropdown.js
@@ -2,7 +2,6 @@ import $ from 'jquery'
 import Popper from 'popper.js'
 import Util from './util'
 
-
 /**
  * --------------------------------------------------------------------------
  * Bootstrap (v4.0.0-beta.3): dropdown.js
@@ -11,7 +10,6 @@ import Util from './util'
  */
 
 const Dropdown = (($) => {
-
   /**
    * ------------------------------------------------------------------------
    * Constants
@@ -85,7 +83,6 @@ const Dropdown = (($) => {
     boundary    : '(string|element)'
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Class Definition
@@ -93,7 +90,6 @@ const Dropdown = (($) => {
    */
 
   class Dropdown {
-
     constructor(element, config) {
       this._element  = element
       this._popper   = null
@@ -104,8 +100,7 @@ const Dropdown = (($) => {
       this._addEventListeners()
     }
 
-
-    // getters
+    // Getters
 
     static get VERSION() {
       return VERSION
@@ -119,7 +114,7 @@ const Dropdown = (($) => {
       return DefaultType
     }
 
-    // public
+    // Public
 
     toggle() {
       if (this._element.disabled || $(this._element).hasClass(ClassName.DISABLED)) {
@@ -136,7 +131,7 @@ const Dropdown = (($) => {
       }
 
       const relatedTarget = {
-        relatedTarget : this._element
+        relatedTarget: this._element
       }
       const showEvent = $.Event(Event.SHOW, relatedTarget)
 
@@ -153,10 +148,10 @@ const Dropdown = (($) => {
          * Popper - https://popper.js.org
          */
         if (typeof Popper === 'undefined') {
-          throw new Error('Bootstrap dropdown require Popper.js (https://popper.js.org)')
+          throw new TypeError('Bootstrap dropdown require Popper.js (https://popper.js.org)')
         }
         let element = this._element
-        // for dropup with alignment we use the parent as popper container
+        // For dropup with alignment we use the parent as popper container
         if ($(parent).hasClass(ClassName.DROPUP)) {
           if ($(this._menu).hasClass(ClassName.MENULEFT) || $(this._menu).hasClass(ClassName.MENURIGHT)) {
             element = parent
@@ -171,13 +166,12 @@ const Dropdown = (($) => {
         this._popper = new Popper(element, this._menu, this._getPopperConfig())
       }
 
-
-      // if this is a touch-enabled device we add extra
+      // If this is a touch-enabled device we add extra
       // empty mouseover listeners to the body's immediate children;
       // only needed because of broken event delegation on iOS
       // https://www.quirksmode.org/blog/archives/2014/02/mouse_event_bub.html
       if ('ontouchstart' in document.documentElement &&
-         !$(parent).closest(Selector.NAVBAR_NAV).length) {
+         $(parent).closest(Selector.NAVBAR_NAV).length === 0) {
         $('body').children().on('mouseover', null, $.noop)
       }
 
@@ -208,7 +202,7 @@ const Dropdown = (($) => {
       }
     }
 
-    // private
+    // Private
 
     _addEventListeners() {
       $(this._element).on(Event.CLICK, (event) => {
@@ -244,7 +238,7 @@ const Dropdown = (($) => {
 
     _getPlacement() {
       const $parentDropdown = $(this._element).parent()
-      let placement         = AttachmentMap.BOTTOM
+      let placement = AttachmentMap.BOTTOM
 
       // Handle dropup
       if ($parentDropdown.hasClass(ClassName.DROPUP)) {
@@ -280,14 +274,14 @@ const Dropdown = (($) => {
         offsetConf.offset = this._config.offset
       }
       const popperConfig = {
-        placement : this._getPlacement(),
-        modifiers : {
-          offset : offsetConf,
-          flip : {
-            enabled : this._config.flip
+        placement: this._getPlacement(),
+        modifiers: {
+          offset: offsetConf,
+          flip: {
+            enabled: this._config.flip
           },
-          preventOverflow : {
-            boundariesElement : this._config.boundary
+          preventOverflow: {
+            boundariesElement: this._config.boundary
           }
         }
       }
@@ -295,7 +289,7 @@ const Dropdown = (($) => {
       return popperConfig
     }
 
-    // static
+    // Static
 
     static _jQueryInterface(config) {
       return this.each(function () {
@@ -309,7 +303,7 @@ const Dropdown = (($) => {
 
         if (typeof config === 'string') {
           if (typeof data[config] === 'undefined') {
-            throw new Error(`No method named "${config}"`)
+            throw new TypeError(`No method named "${config}"`)
           }
           data[config]()
         }
@@ -324,10 +318,10 @@ const Dropdown = (($) => {
 
       const toggles = $.makeArray($(Selector.DATA_TOGGLE))
       for (let i = 0; i < toggles.length; i++) {
-        const parent        = Dropdown._getParentFromElement(toggles[i])
-        const context       = $(toggles[i]).data(DATA_KEY)
+        const parent = Dropdown._getParentFromElement(toggles[i])
+        const context = $(toggles[i]).data(DATA_KEY)
         const relatedTarget = {
-          relatedTarget : toggles[i]
+          relatedTarget: toggles[i]
         }
 
         if (!context) {
@@ -340,8 +334,8 @@ const Dropdown = (($) => {
         }
 
         if (event && (event.type === 'click' &&
-            /input|textarea/i.test(event.target.tagName) || event.type === 'keyup' && event.which === TAB_KEYCODE)
-            && $.contains(parent, event.target)) {
+            /input|textarea/i.test(event.target.tagName) || event.type === 'keyup' && event.which === TAB_KEYCODE) &&
+            $.contains(parent, event.target)) {
           continue
         }
 
@@ -351,7 +345,7 @@ const Dropdown = (($) => {
           continue
         }
 
-        // if this is a touch-enabled device we remove the extra
+        // If this is a touch-enabled device we remove the extra
         // empty mouseover listeners we added for iOS support
         if ('ontouchstart' in document.documentElement) {
           $('body').children().off('mouseover', null, $.noop)
@@ -386,8 +380,8 @@ const Dropdown = (($) => {
       //  - If key is other than escape
       //    - If key is not up or down => not a dropdown command
       //    - If trigger inside the menu => not a dropdown command
-      if (/input|textarea/i.test(event.target.tagName) ?
-        event.which === SPACE_KEYCODE || event.which !== ESCAPE_KEYCODE &&
+      if (/input|textarea/i.test(event.target.tagName)
+        ? event.which === SPACE_KEYCODE || event.which !== ESCAPE_KEYCODE &&
         (event.which !== ARROW_DOWN_KEYCODE && event.which !== ARROW_UP_KEYCODE ||
           $(event.target).closest(Selector.MENU).length) : !REGEXP_KEYDOWN.test(event.which)) {
         return
@@ -405,7 +399,6 @@ const Dropdown = (($) => {
 
       if (!isActive && (event.which !== ESCAPE_KEYCODE || event.which !== SPACE_KEYCODE) ||
            isActive && (event.which === ESCAPE_KEYCODE || event.which === SPACE_KEYCODE)) {
-
         if (event.which === ESCAPE_KEYCODE) {
           const toggle = $(parent).find(Selector.DATA_TOGGLE)[0]
           $(toggle).trigger('focus')
@@ -417,17 +410,17 @@ const Dropdown = (($) => {
 
       const items = $(parent).find(Selector.VISIBLE_ITEMS).get()
 
-      if (!items.length) {
+      if (items.length === 0) {
         return
       }
 
       let index = items.indexOf(event.target)
 
-      if (event.which === ARROW_UP_KEYCODE && index > 0) { // up
+      if (event.which === ARROW_UP_KEYCODE && index > 0) { // Up
         index--
       }
 
-      if (event.which === ARROW_DOWN_KEYCODE && index < items.length - 1) { // down
+      if (event.which === ARROW_DOWN_KEYCODE && index < items.length - 1) { // Down
         index++
       }
 
@@ -437,10 +430,8 @@ const Dropdown = (($) => {
 
       items[index].focus()
     }
-
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Data Api implementation
@@ -448,7 +439,7 @@ const Dropdown = (($) => {
    */
 
   $(document)
-    .on(Event.KEYDOWN_DATA_API, Selector.DATA_TOGGLE,  Dropdown._dataApiKeydownHandler)
+    .on(Event.KEYDOWN_DATA_API, Selector.DATA_TOGGLE, Dropdown._dataApiKeydownHandler)
     .on(Event.KEYDOWN_DATA_API, Selector.MENU, Dropdown._dataApiKeydownHandler)
     .on(`${Event.CLICK_DATA_API} ${Event.KEYUP_DATA_API}`, Dropdown._clearMenus)
     .on(Event.CLICK_DATA_API, Selector.DATA_TOGGLE, function (event) {
@@ -460,22 +451,20 @@ const Dropdown = (($) => {
       e.stopPropagation()
     })
 
-
   /**
    * ------------------------------------------------------------------------
    * jQuery
    * ------------------------------------------------------------------------
    */
 
-  $.fn[NAME]             = Dropdown._jQueryInterface
+  $.fn[NAME] = Dropdown._jQueryInterface
   $.fn[NAME].Constructor = Dropdown
-  $.fn[NAME].noConflict  = function () {
+  $.fn[NAME].noConflict = function () {
     $.fn[NAME] = JQUERY_NO_CONFLICT
     return Dropdown._jQueryInterface
   }
 
   return Dropdown
-
 })($, Popper)
 
 export default Dropdown
diff --git a/js/src/index.js b/js/src/index.js
index 51d09b4e2..db504319c 100644
--- a/js/src/index.js
+++ b/js/src/index.js
@@ -20,12 +20,12 @@ import Util from './util'
 
 (($) => {
   if (typeof $ === 'undefined') {
-    throw new Error('Bootstrap\'s JavaScript requires jQuery. jQuery must be included before Bootstrap\'s JavaScript.')
+    throw new TypeError('Bootstrap\'s JavaScript requires jQuery. jQuery must be included before Bootstrap\'s JavaScript.')
   }
 
   const version = $.fn.jquery.split(' ')[0].split('.')
   const minMajor = 1
-  const ltMajor  = 2
+  const ltMajor = 2
   const minMinor = 9
   const minPatch = 1
   const maxMajor = 4
diff --git a/js/src/modal.js b/js/src/modal.js
index e98277a6d..ef5994f98 100644
--- a/js/src/modal.js
+++ b/js/src/modal.js
@@ -1,7 +1,6 @@
 import $ from 'jquery'
 import Util from './util'
 
-
 /**
  * --------------------------------------------------------------------------
  * Bootstrap (v4.0.0-beta.3): modal.js
@@ -10,8 +9,6 @@ import Util from './util'
  */
 
 const Modal = (($) => {
-
-
   /**
    * ------------------------------------------------------------------------
    * Constants
@@ -73,7 +70,6 @@ const Modal = (($) => {
     NAVBAR_TOGGLER     : '.navbar-toggler'
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Class Definition
@@ -81,7 +77,6 @@ const Modal = (($) => {
    */
 
   class Modal {
-
     constructor(element, config) {
       this._config              = this._getConfig(config)
       this._element             = element
@@ -94,8 +89,7 @@ const Modal = (($) => {
       this._scrollbarWidth      = 0
     }
 
-
-    // getters
+    // Getters
 
     static get VERSION() {
       return VERSION
@@ -105,8 +99,7 @@ const Modal = (($) => {
       return Default
     }
 
-
-    // public
+    // Public
 
     toggle(relatedTarget) {
       return this._isShown ? this.hide() : this.show(relatedTarget)
@@ -196,7 +189,6 @@ const Modal = (($) => {
       $(this._dialog).off(Event.MOUSEDOWN_DISMISS)
 
       if (transition) {
-
         $(this._element)
           .one(Util.TRANSITION_END, (event) => this._hideModal(event))
           .emulateTransitionEnd(TRANSITION_DURATION)
@@ -224,7 +216,7 @@ const Modal = (($) => {
       this._adjustDialog()
     }
 
-    // private
+    // Private
 
     _getConfig(config) {
       config = {
@@ -241,7 +233,7 @@ const Modal = (($) => {
 
       if (!this._element.parentNode ||
          this._element.parentNode.nodeType !== Node.ELEMENT_NODE) {
-        // don't move modals dom position
+        // Don't move modal's DOM position
         document.body.appendChild(this._element)
       }
 
@@ -282,11 +274,11 @@ const Modal = (($) => {
 
     _enforceFocus() {
       $(document)
-        .off(Event.FOCUSIN) // guard against infinite focus loop
+        .off(Event.FOCUSIN) // Guard against infinite focus loop
         .on(Event.FOCUSIN, (event) => {
           if (document !== event.target &&
               this._element !== event.target &&
-              !$(this._element).has(event.target).length) {
+              $(this._element).has(event.target).length === 0) {
             this._element.focus()
           }
         })
@@ -300,7 +292,6 @@ const Modal = (($) => {
             this.hide()
           }
         })
-
       } else if (!this._isShown) {
         $(this._element).off(Event.KEYDOWN_DISMISS)
       }
@@ -334,8 +325,8 @@ const Modal = (($) => {
     }
 
     _showBackdrop(callback) {
-      const animate = $(this._element).hasClass(ClassName.FADE) ?
-        ClassName.FADE : ''
+      const animate = $(this._element).hasClass(ClassName.FADE)
+        ? ClassName.FADE : ''
 
       if (this._isShown && this._config.backdrop) {
         const doAnimate = Util.supportsTransitionEnd() && animate
@@ -382,7 +373,6 @@ const Modal = (($) => {
         $(this._backdrop)
           .one(Util.TRANSITION_END, callback)
           .emulateTransitionEnd(BACKDROP_TRANSITION_DURATION)
-
       } else if (!this._isShown && this._backdrop) {
         $(this._backdrop).removeClass(ClassName.SHOW)
 
@@ -401,13 +391,11 @@ const Modal = (($) => {
         } else {
           callbackRemove()
         }
-
       } else if (callback) {
         callback()
       }
     }
 
-
     // ----------------------------------------------------------------------
     // the following methods are used to handle overflowing modals
     // todo (fat): these should probably be refactored out of modal.js
@@ -503,12 +491,11 @@ const Modal = (($) => {
       return scrollbarWidth
     }
 
-
-    // static
+    // Static
 
     static _jQueryInterface(config, relatedTarget) {
       return this.each(function () {
-        let data      = $(this).data(DATA_KEY)
+        let data = $(this).data(DATA_KEY)
         const _config = {
           ...Modal.Default,
           ...$(this).data(),
@@ -522,7 +509,7 @@ const Modal = (($) => {
 
         if (typeof config === 'string') {
           if (typeof data[config] === 'undefined') {
-            throw new Error(`No method named "${config}"`)
+            throw new TypeError(`No method named "${config}"`)
           }
           data[config](relatedTarget)
         } else if (_config.show) {
@@ -530,10 +517,8 @@ const Modal = (($) => {
         }
       })
     }
-
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Data Api implementation
@@ -548,8 +533,8 @@ const Modal = (($) => {
       target = $(selector)[0]
     }
 
-    const config = $(target).data(DATA_KEY) ?
-      'toggle' : {
+    const config = $(target).data(DATA_KEY)
+      ? 'toggle' : {
         ...$(target).data(),
         ...$(this).data()
       }
@@ -560,7 +545,7 @@ const Modal = (($) => {
 
     const $target = $(target).one(Event.SHOW, (showEvent) => {
       if (showEvent.isDefaultPrevented()) {
-        // only register focus restorer if modal will actually get shown
+        // Only register focus restorer if modal will actually get shown
         return
       }
 
@@ -574,22 +559,20 @@ const Modal = (($) => {
     Modal._jQueryInterface.call($(target), config, this)
   })
 
-
   /**
    * ------------------------------------------------------------------------
    * jQuery
    * ------------------------------------------------------------------------
    */
 
-  $.fn[NAME]             = Modal._jQueryInterface
+  $.fn[NAME] = Modal._jQueryInterface
   $.fn[NAME].Constructor = Modal
-  $.fn[NAME].noConflict  = function () {
+  $.fn[NAME].noConflict = function () {
     $.fn[NAME] = JQUERY_NO_CONFLICT
     return Modal._jQueryInterface
   }
 
   return Modal
-
 })($)
 
 export default Modal
diff --git a/js/src/popover.js b/js/src/popover.js
index f557e8bcd..02d682732 100644
--- a/js/src/popover.js
+++ b/js/src/popover.js
@@ -1,7 +1,6 @@
 import $ from 'jquery'
 import Tooltip from './tooltip'
 
-
 /**
  * --------------------------------------------------------------------------
  * Bootstrap (v4.0.0-beta.3): popover.js
@@ -10,8 +9,6 @@ import Tooltip from './tooltip'
  */
 
 const Popover = (($) => {
-
-
   /**
    * ------------------------------------------------------------------------
    * Constants
@@ -31,10 +28,10 @@ const Popover = (($) => {
     placement : 'right',
     trigger   : 'click',
     content   : '',
-    template  : '<div class="popover" role="tooltip">'
-              + '<div class="arrow"></div>'
-              + '<h3 class="popover-header"></h3>'
-              + '<div class="popover-body"></div></div>'
+    template  : '<div class="popover" role="tooltip">' +
+                '<div class="arrow"></div>' +
+                '<h3 class="popover-header"></h3>' +
+                '<div class="popover-body"></div></div>'
   }
 
   const DefaultType = {
@@ -65,7 +62,6 @@ const Popover = (($) => {
     MOUSELEAVE : `mouseleave${EVENT_KEY}`
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Class Definition
@@ -73,9 +69,7 @@ const Popover = (($) => {
    */
 
   class Popover extends Tooltip {
-
-
-    // getters
+    // Getters
 
     static get VERSION() {
       return VERSION
@@ -105,8 +99,7 @@ const Popover = (($) => {
       return DefaultType
     }
 
-
-    // overrides
+    // Overrides
 
     isWithContent() {
       return this.getTitle() || this._getContent()
@@ -124,7 +117,7 @@ const Popover = (($) => {
     setContent() {
       const $tip = $(this.getTipElement())
 
-      // we use append for html objects to maintain js events
+      // We use append for html objects to maintain js events
       this.setElementContent($tip.find(Selector.TITLE), this.getTitle())
       let content = this._getContent()
       if (typeof content === 'function') {
@@ -135,11 +128,11 @@ const Popover = (($) => {
       $tip.removeClass(`${ClassName.FADE} ${ClassName.SHOW}`)
     }
 
-    // private
+    // Private
 
     _getContent() {
-      return this.element.getAttribute('data-content')
-        || this.config.content
+      return this.element.getAttribute('data-content') ||
+        this.config.content
     }
 
     _cleanTipClass() {
@@ -150,12 +143,11 @@ const Popover = (($) => {
       }
     }
 
-
-    // static
+    // Static
 
     static _jQueryInterface(config) {
       return this.each(function () {
-        let data      = $(this).data(DATA_KEY)
+        let data = $(this).data(DATA_KEY)
         const _config = typeof config === 'object' ? config : null
 
         if (!data && /destroy|hide/.test(config)) {
@@ -169,7 +161,7 @@ const Popover = (($) => {
 
         if (typeof config === 'string') {
           if (typeof data[config] === 'undefined') {
-            throw new Error(`No method named "${config}"`)
+            throw new TypeError(`No method named "${config}"`)
           }
           data[config]()
         }
@@ -177,22 +169,20 @@ const Popover = (($) => {
     }
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * jQuery
    * ------------------------------------------------------------------------
    */
 
-  $.fn[NAME]             = Popover._jQueryInterface
+  $.fn[NAME] = Popover._jQueryInterface
   $.fn[NAME].Constructor = Popover
-  $.fn[NAME].noConflict  = function () {
+  $.fn[NAME].noConflict = function () {
     $.fn[NAME] = JQUERY_NO_CONFLICT
     return Popover._jQueryInterface
   }
 
   return Popover
-
 })($)
 
 export default Popover
diff --git a/js/src/scrollspy.js b/js/src/scrollspy.js
index 9a2562a7c..da2941351 100644
--- a/js/src/scrollspy.js
+++ b/js/src/scrollspy.js
@@ -1,7 +1,6 @@
 import $ from 'jquery'
 import Util from './util'
 
-
 /**
  * --------------------------------------------------------------------------
  * Bootstrap (v4.0.0-beta.3): scrollspy.js
@@ -10,8 +9,6 @@ import Util from './util'
  */
 
 const ScrollSpy = (($) => {
-
-
   /**
    * ------------------------------------------------------------------------
    * Constants
@@ -66,7 +63,6 @@ const ScrollSpy = (($) => {
     POSITION : 'position'
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Class Definition
@@ -74,14 +70,13 @@ const ScrollSpy = (($) => {
    */
 
   class ScrollSpy {
-
     constructor(element, config) {
       this._element       = element
       this._scrollElement = element.tagName === 'BODY' ? window : element
       this._config        = this._getConfig(config)
-      this._selector      = `${this._config.target} ${Selector.NAV_LINKS},`
-                          + `${this._config.target} ${Selector.LIST_ITEMS},`
-                          + `${this._config.target} ${Selector.DROPDOWN_ITEMS}`
+      this._selector      = `${this._config.target} ${Selector.NAV_LINKS},` +
+                            `${this._config.target} ${Selector.LIST_ITEMS},` +
+                            `${this._config.target} ${Selector.DROPDOWN_ITEMS}`
       this._offsets       = []
       this._targets       = []
       this._activeTarget  = null
@@ -93,8 +88,7 @@ const ScrollSpy = (($) => {
       this._process()
     }
 
-
-    // getters
+    // Getters
 
     static get VERSION() {
       return VERSION
@@ -104,18 +98,17 @@ const ScrollSpy = (($) => {
       return Default
     }
 
-
-    // public
+    // Public
 
     refresh() {
-      const autoMethod = this._scrollElement !== this._scrollElement.window ?
-        OffsetMethod.POSITION : OffsetMethod.OFFSET
+      const autoMethod = this._scrollElement === this._scrollElement.window
+        ? OffsetMethod.OFFSET : OffsetMethod.POSITION
 
-      const offsetMethod = this._config.method === 'auto' ?
-        autoMethod : this._config.method
+      const offsetMethod = this._config.method === 'auto'
+        ? autoMethod : this._config.method
 
-      const offsetBase = offsetMethod === OffsetMethod.POSITION ?
-        this._getScrollTop() : 0
+      const offsetBase = offsetMethod === OffsetMethod.POSITION
+        ? this._getScrollTop() : 0
 
       this._offsets = []
       this._targets = []
@@ -136,7 +129,7 @@ const ScrollSpy = (($) => {
           if (target) {
             const targetBCR = target.getBoundingClientRect()
             if (targetBCR.width || targetBCR.height) {
-              // todo (fat): remove sketch reliance on jQuery position/offset
+              // TODO (fat): remove sketch reliance on jQuery position/offset
               return [
                 $(target)[offsetMethod]().top + offsetBase,
                 targetSelector
@@ -145,8 +138,8 @@ const ScrollSpy = (($) => {
           }
           return null
         })
-        .filter((item)  => item)
-        .sort((a, b)    => a[0] - b[0])
+        .filter((item) => item)
+        .sort((a, b) => a[0] - b[0])
         .forEach((item) => {
           this._offsets.push(item[0])
           this._targets.push(item[1])
@@ -167,8 +160,7 @@ const ScrollSpy = (($) => {
       this._scrollHeight  = null
     }
 
-
-    // private
+    // Private
 
     _getConfig(config) {
       config = {
@@ -191,8 +183,8 @@ const ScrollSpy = (($) => {
     }
 
     _getScrollTop() {
-      return this._scrollElement === window ?
-          this._scrollElement.pageYOffset : this._scrollElement.scrollTop
+      return this._scrollElement === window
+        ? this._scrollElement.pageYOffset : this._scrollElement.scrollTop
     }
 
     _getScrollHeight() {
@@ -203,16 +195,16 @@ const ScrollSpy = (($) => {
     }
 
     _getOffsetHeight() {
-      return this._scrollElement === window ?
-          window.innerHeight : this._scrollElement.getBoundingClientRect().height
+      return this._scrollElement === window
+        ? window.innerHeight : this._scrollElement.getBoundingClientRect().height
     }
 
     _process() {
       const scrollTop    = this._getScrollTop() + this._config.offset
       const scrollHeight = this._getScrollHeight()
-      const maxScroll    = this._config.offset
-        + scrollHeight
-        - this._getOffsetHeight()
+      const maxScroll    = this._config.offset +
+        scrollHeight -
+        this._getOffsetHeight()
 
       if (this._scrollHeight !== scrollHeight) {
         this.refresh()
@@ -234,9 +226,9 @@ const ScrollSpy = (($) => {
       }
 
       for (let i = this._offsets.length; i--;) {
-        const isActiveTarget = this._activeTarget !== this._targets[i]
-            && scrollTop >= this._offsets[i]
-            && (typeof this._offsets[i + 1] === 'undefined' ||
+        const isActiveTarget = this._activeTarget !== this._targets[i] &&
+            scrollTop >= this._offsets[i] &&
+            (typeof this._offsets[i + 1] === 'undefined' ||
                 scrollTop < this._offsets[i + 1])
 
         if (isActiveTarget) {
@@ -252,7 +244,7 @@ const ScrollSpy = (($) => {
 
       let queries = this._selector.split(',')
       // eslint-disable-next-line arrow-body-style
-      queries     = queries.map((selector) => {
+      queries = queries.map((selector) => {
         return `${selector}[data-target="${target}"],` +
                `${selector}[href="${target}"]`
       })
@@ -281,12 +273,11 @@ const ScrollSpy = (($) => {
       $(this._selector).filter(Selector.ACTIVE).removeClass(ClassName.ACTIVE)
     }
 
-
-    // static
+    // Static
 
     static _jQueryInterface(config) {
       return this.each(function () {
-        let data      = $(this).data(DATA_KEY)
+        let data = $(this).data(DATA_KEY)
         const _config = typeof config === 'object' && config
 
         if (!data) {
@@ -296,17 +287,14 @@ const ScrollSpy = (($) => {
 
         if (typeof config === 'string') {
           if (typeof data[config] === 'undefined') {
-            throw new Error(`No method named "${config}"`)
+            throw new TypeError(`No method named "${config}"`)
           }
           data[config]()
         }
       })
     }
-
-
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Data Api implementation
@@ -322,22 +310,20 @@ const ScrollSpy = (($) => {
     }
   })
 
-
   /**
    * ------------------------------------------------------------------------
    * jQuery
    * ------------------------------------------------------------------------
    */
 
-  $.fn[NAME]             = ScrollSpy._jQueryInterface
+  $.fn[NAME] = ScrollSpy._jQueryInterface
   $.fn[NAME].Constructor = ScrollSpy
-  $.fn[NAME].noConflict  = function () {
+  $.fn[NAME].noConflict = function () {
     $.fn[NAME] = JQUERY_NO_CONFLICT
     return ScrollSpy._jQueryInterface
   }
 
   return ScrollSpy
-
 })($)
 
 export default ScrollSpy
diff --git a/js/src/tab.js b/js/src/tab.js
index e501568e7..0ae060c46 100644
--- a/js/src/tab.js
+++ b/js/src/tab.js
@@ -1,7 +1,6 @@
 import $ from 'jquery'
 import Util from './util'
 
-
 /**
  * --------------------------------------------------------------------------
  * Bootstrap (v4.0.0-beta.3): tab.js
@@ -10,8 +9,6 @@ import Util from './util'
  */
 
 const Tab = (($) => {
-
-
   /**
    * ------------------------------------------------------------------------
    * Constants
@@ -52,7 +49,6 @@ const Tab = (($) => {
     DROPDOWN_ACTIVE_CHILD : '> .dropdown-menu .active'
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Class Definition
@@ -60,20 +56,17 @@ const Tab = (($) => {
    */
 
   class Tab {
-
     constructor(element) {
       this._element = element
     }
 
-
-    // getters
+    // Getters
 
     static get VERSION() {
       return VERSION
     }
 
-
-    // public
+    // Public
 
     show() {
       if (this._element.parentNode &&
@@ -86,7 +79,7 @@ const Tab = (($) => {
       let target
       let previous
       const listElement = $(this._element).closest(Selector.NAV_LIST_GROUP)[0]
-      const selector    = Util.getSelectorFromElement(this._element)
+      const selector = Util.getSelectorFromElement(this._element)
 
       if (listElement) {
         const itemSelector = listElement.nodeName === 'UL' ? Selector.ACTIVE_UL : Selector.ACTIVE
@@ -147,8 +140,7 @@ const Tab = (($) => {
       this._element = null
     }
 
-
-    // private
+    // Private
 
     _activate(element, container, callback) {
       let activeElements
@@ -158,10 +150,10 @@ const Tab = (($) => {
         activeElements = $(container).children(Selector.ACTIVE)
       }
 
-      const active          = activeElements[0]
-      const isTransitioning = callback
-        && Util.supportsTransitionEnd()
-        && (active && $(active).hasClass(ClassName.FADE))
+      const active = activeElements[0]
+      const isTransitioning = callback &&
+        Util.supportsTransitionEnd() &&
+        (active && $(active).hasClass(ClassName.FADE))
 
       const complete = () => this._transitionComplete(
         element,
@@ -205,7 +197,6 @@ const Tab = (($) => {
 
       if (element.parentNode &&
           $(element.parentNode).hasClass(ClassName.DROPDOWN_MENU)) {
-
         const dropdownElement = $(element).closest(Selector.DROPDOWN)[0]
         if (dropdownElement) {
           $(dropdownElement).find(Selector.DROPDOWN_TOGGLE).addClass(ClassName.ACTIVE)
@@ -219,13 +210,12 @@ const Tab = (($) => {
       }
     }
 
-
-    // static
+    // Static
 
     static _jQueryInterface(config) {
       return this.each(function () {
         const $this = $(this)
-        let data    = $this.data(DATA_KEY)
+        let data = $this.data(DATA_KEY)
 
         if (!data) {
           data = new Tab(this)
@@ -234,16 +224,14 @@ const Tab = (($) => {
 
         if (typeof config === 'string') {
           if (typeof data[config] === 'undefined') {
-            throw new Error(`No method named "${config}"`)
+            throw new TypeError(`No method named "${config}"`)
           }
           data[config]()
         }
       })
     }
-
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * Data Api implementation
@@ -256,22 +244,20 @@ const Tab = (($) => {
       Tab._jQueryInterface.call($(this), 'show')
     })
 
-
   /**
    * ------------------------------------------------------------------------
    * jQuery
    * ------------------------------------------------------------------------
    */
 
-  $.fn[NAME]             = Tab._jQueryInterface
+  $.fn[NAME] = Tab._jQueryInterface
   $.fn[NAME].Constructor = Tab
-  $.fn[NAME].noConflict  = function () {
+  $.fn[NAME].noConflict = function () {
     $.fn[NAME] = JQUERY_NO_CONFLICT
     return Tab._jQueryInterface
   }
 
   return Tab
-
 })($)
 
 export default Tab
diff --git a/js/src/tooltip.js b/js/src/tooltip.js
index c26cdc387..403f7e5b1 100644
--- a/js/src/tooltip.js
+++ b/js/src/tooltip.js
@@ -2,7 +2,6 @@ import $ from 'jquery'
 import Popper from 'popper.js'
 import Util from './util'
 
-
 /**
  * --------------------------------------------------------------------------
  * Bootstrap (v4.0.0-beta.3): tooltip.js
@@ -11,7 +10,6 @@ import Util from './util'
  */
 
 const Tooltip = (($) => {
-
   /**
    * ------------------------------------------------------------------------
    * Constants
@@ -52,9 +50,9 @@ const Tooltip = (($) => {
 
   const Default = {
     animation           : true,
-    template            : '<div class="tooltip" role="tooltip">'
-                        + '<div class="arrow"></div>'
-                        + '<div class="tooltip-inner"></div></div>',
+    template            : '<div class="tooltip" role="tooltip">' +
+                        '<div class="arrow"></div>' +
+                        '<div class="tooltip-inner"></div></div>',
     trigger             : 'hover focus',
     title               : '',
     delay               : 0,
@@ -111,14 +109,13 @@ const Tooltip = (($) => {
    */
 
   class Tooltip {
-
     constructor(element, config) {
       /**
        * Check for Popper dependency
        * Popper - https://popper.js.org
        */
       if (typeof Popper === 'undefined') {
-        throw new Error('Bootstrap tooltips require Popper.js (https://popper.js.org)')
+        throw new TypeError('Bootstrap tooltips require Popper.js (https://popper.js.org)')
       }
 
       // private
@@ -128,17 +125,15 @@ const Tooltip = (($) => {
       this._activeTrigger = {}
       this._popper        = null
 
-      // protected
+      // Protected
       this.element = element
       this.config  = this._getConfig(config)
       this.tip     = null
 
       this._setListeners()
-
     }
 
-
-    // getters
+    // Getters
 
     static get VERSION() {
       return VERSION
@@ -168,8 +163,7 @@ const Tooltip = (($) => {
       return DefaultType
     }
 
-
-    // public
+    // Public
 
     enable() {
       this._isEnabled = true
@@ -207,9 +201,7 @@ const Tooltip = (($) => {
         } else {
           context._leave(null, context)
         }
-
       } else {
-
         if ($(this.getTipElement()).hasClass(ClassName.SHOW)) {
           this._leave(null, this)
           return
@@ -275,9 +267,9 @@ const Tooltip = (($) => {
           $(tip).addClass(ClassName.FADE)
         }
 
-        const placement  = typeof this.config.placement === 'function' ?
-          this.config.placement.call(this, tip, this.element) :
-          this.config.placement
+        const placement  = typeof this.config.placement === 'function'
+          ? this.config.placement.call(this, tip, this.element)
+          : this.config.placement
 
         const attachment = this._getAttachment(placement)
         this.addAttachmentClass(attachment)
@@ -313,14 +305,14 @@ const Tooltip = (($) => {
               this._handlePopperPlacementChange(data)
             }
           },
-          onUpdate : (data) => {
+          onUpdate: (data) => {
             this._handlePopperPlacementChange(data)
           }
         })
 
         $(tip).addClass(ClassName.SHOW)
 
-        // if this is a touch-enabled device we add extra
+        // If this is a touch-enabled device we add extra
         // empty mouseover listeners to the body's immediate children;
         // only needed because of broken event delegation on iOS
         // https://www.quirksmode.org/blog/archives/2014/02/mouse_event_bub.html
@@ -355,7 +347,7 @@ const Tooltip = (($) => {
     hide(callback) {
       const tip       = this.getTipElement()
       const hideEvent = $.Event(this.constructor.Event.HIDE)
-      const complete  = () => {
+      const complete = () => {
         if (this._hoverState !== HoverState.SHOW && tip.parentNode) {
           tip.parentNode.removeChild(tip)
         }
@@ -380,7 +372,7 @@ const Tooltip = (($) => {
 
       $(tip).removeClass(ClassName.SHOW)
 
-      // if this is a touch-enabled device we remove the extra
+      // If this is a touch-enabled device we remove the extra
       // empty mouseover listeners we added for iOS support
       if ('ontouchstart' in document.documentElement) {
         $('body').children().off('mouseover', null, $.noop)
@@ -392,17 +384,14 @@ const Tooltip = (($) => {
 
       if (Util.supportsTransitionEnd() &&
           $(this.tip).hasClass(ClassName.FADE)) {
-
         $(tip)
           .one(Util.TRANSITION_END, complete)
           .emulateTransitionEnd(TRANSITION_DURATION)
-
       } else {
         complete()
       }
 
       this._hoverState = ''
-
     }
 
     update() {
@@ -411,7 +400,7 @@ const Tooltip = (($) => {
       }
     }
 
-    // protected
+    // Protected
 
     isWithContent() {
       return Boolean(this.getTitle())
@@ -435,7 +424,7 @@ const Tooltip = (($) => {
     setElementContent($element, content) {
       const html = this.config.html
       if (typeof content === 'object' && (content.nodeType || content.jquery)) {
-        // content is a DOM node or a jQuery
+        // Content is a DOM node or a jQuery
         if (html) {
           if (!$(content).parent().is($element)) {
             $element.empty().append(content)
@@ -452,16 +441,15 @@ const Tooltip = (($) => {
       let title = this.element.getAttribute('data-original-title')
 
       if (!title) {
-        title = typeof this.config.title === 'function' ?
-          this.config.title.call(this.element) :
-          this.config.title
+        title = typeof this.config.title === 'function'
+          ? this.config.title.call(this.element)
+          : this.config.title
       }
 
       return title
     }
 
-
-    // private
+    // Private
 
     _getAttachment(placement) {
       return AttachmentMap[placement.toUpperCase()]
@@ -477,14 +465,13 @@ const Tooltip = (($) => {
             this.config.selector,
             (event) => this.toggle(event)
           )
-
         } else if (trigger !== Trigger.MANUAL) {
-          const eventIn  = trigger === Trigger.HOVER ?
-            this.constructor.Event.MOUSEENTER :
-            this.constructor.Event.FOCUSIN
-          const eventOut = trigger === Trigger.HOVER ?
-            this.constructor.Event.MOUSELEAVE :
-            this.constructor.Event.FOCUSOUT
+          const eventIn = trigger === Trigger.HOVER
+            ? this.constructor.Event.MOUSEENTER
+            : this.constructor.Event.FOCUSIN
+          const eventOut = trigger === Trigger.HOVER
+            ? this.constructor.Event.MOUSELEAVE
+            : this.constructor.Event.FOCUSOUT
 
           $(this.element)
             .on(
@@ -508,8 +495,8 @@ const Tooltip = (($) => {
       if (this.config.selector) {
         this.config = {
           ...this.config,
-          trigger  : 'manual',
-          selector : ''
+          trigger: 'manual',
+          selector: ''
         }
       } else {
         this._fixTitle()
@@ -627,8 +614,8 @@ const Tooltip = (($) => {
 
       if (typeof config.delay === 'number') {
         config.delay = {
-          show : config.delay,
-          hide : config.delay
+          show: config.delay,
+          hide: config.delay
         }
       }
 
@@ -677,7 +664,7 @@ const Tooltip = (($) => {
     }
 
     _fixTransition() {
-      const tip                 = this.getTipElement()
+      const tip = this.getTipElement()
       const initConfigAnimation = this.config.animation
       if (tip.getAttribute('x-placement') !== null) {
         return
@@ -689,11 +676,11 @@ const Tooltip = (($) => {
       this.config.animation = initConfigAnimation
     }
 
-    // static
+    // Static
 
     static _jQueryInterface(config) {
       return this.each(function () {
-        let data      = $(this).data(DATA_KEY)
+        let data = $(this).data(DATA_KEY)
         const _config = typeof config === 'object' && config
 
         if (!data && /dispose|hide/.test(config)) {
@@ -707,7 +694,7 @@ const Tooltip = (($) => {
 
         if (typeof config === 'string') {
           if (typeof data[config] === 'undefined') {
-            throw new Error(`No method named "${config}"`)
+            throw new TypeError(`No method named "${config}"`)
           }
           data[config]()
         }
@@ -715,22 +702,20 @@ const Tooltip = (($) => {
     }
   }
 
-
   /**
    * ------------------------------------------------------------------------
    * jQuery
    * ------------------------------------------------------------------------
    */
 
-  $.fn[NAME]             = Tooltip._jQueryInterface
+  $.fn[NAME] = Tooltip._jQueryInterface
   $.fn[NAME].Constructor = Tooltip
-  $.fn[NAME].noConflict  = function () {
+  $.fn[NAME].noConflict = function () {
     $.fn[NAME] = JQUERY_NO_CONFLICT
     return Tooltip._jQueryInterface
   }
 
   return Tooltip
-
 })($, Popper)
 
 export default Tooltip
diff --git a/js/src/util.js b/js/src/util.js
index 0ffbb76a3..373b8adac 100644
--- a/js/src/util.js
+++ b/js/src/util.js
@@ -8,8 +8,6 @@ import $ from 'jquery'
  */
 
 const Util = (($) => {
-
-
   /**
    * ------------------------------------------------------------------------
    * Private TransitionEnd Helpers
@@ -20,7 +18,7 @@ const Util = (($) => {
 
   const MAX_UID = 1000000
 
-  // shoutout AngusCroll (https://goo.gl/pxwQGp)
+  // Shoutout AngusCroll (https://goo.gl/pxwQGp)
   function toType(obj) {
     return {}.toString.call(obj).match(/\s([a-zA-Z]+)/)[1].toLowerCase()
   }
@@ -75,10 +73,10 @@ const Util = (($) => {
   }
 
   function escapeId(selector) {
-    // we escape IDs in case of special selectors (selector = '#myId:something')
+    // We escape IDs in case of special selectors (selector = '#myId:something')
     // $.escapeSelector does not exist in jQuery < 3
-    selector = typeof $.escapeSelector === 'function' ? $.escapeSelector(selector).substr(1) :
-      selector.replace(/(:|\.|\[|\]|,|=|@)/g, '\\$1')
+    selector = typeof $.escapeSelector === 'function' ? $.escapeSelector(selector).substr(1)
+      : selector.replace(/(:|\.|\[|\]|,|=|@)/g, '\\$1')
 
     return selector
   }
@@ -107,7 +105,7 @@ const Util = (($) => {
         selector = element.getAttribute('href') || ''
       }
 
-      // if it's an ID
+      // If it's an ID
       if (selector.charAt(0) === '#') {
         selector = escapeId(selector)
       }
@@ -115,7 +113,7 @@ const Util = (($) => {
       try {
         const $selector = $(document).find(selector)
         return $selector.length > 0 ? selector : null
-      } catch (error) {
+      } catch (err) {
         return null
       }
     },
@@ -141,8 +139,8 @@ const Util = (($) => {
         if (Object.prototype.hasOwnProperty.call(configTypes, property)) {
           const expectedTypes = configTypes[property]
           const value         = config[property]
-          const valueType     = value && Util.isElement(value) ?
-                                'element' : toType(value)
+          const valueType     = value && Util.isElement(value)
+            ? 'element' : toType(value)
 
           if (!new RegExp(expectedTypes).test(valueType)) {
             throw new Error(
@@ -158,7 +156,6 @@ const Util = (($) => {
   setTransitionEndSupport()
 
   return Util
-
 })($)
 
 export default Util