JS: minor refactoring (#35183)

* add missing comments
* shorten block comments
* reorder constants
* reorder public/private methods
* sort exports alphabetically in util/index.js
* fix a couple of typos

5 files changed, 98 insertions, 56 deletions

diff --git a/js/src/util/backdrop.js b/js/src/util/backdrop.js
index 04c763518b..fb1b2776bc 100644
--- a/js/src/util/backdrop.js
+++ b/js/src/util/backdrop.js
@@ -8,6 +8,15 @@
 import EventHandler from '../dom/event-handler'
 import { execute, executeAfterTransition, getElement, reflow, typeCheckConfig } from './index'
 
+/**
+ * Constants
+ */
+
+const NAME = 'backdrop'
+const CLASS_NAME_FADE = 'fade'
+const CLASS_NAME_SHOW = 'show'
+const EVENT_MOUSEDOWN = `mousedown.bs.${NAME}`
+
 const Default = {
   className: 'modal-backdrop',
   isVisible: true, // if false, we use the backdrop helper without adding any element to the dom
@@ -23,11 +32,10 @@ const DefaultType = {
   rootElement: '(element|string)',
   clickCallback: '(function|null)'
 }
-const NAME = 'backdrop'
-const CLASS_NAME_FADE = 'fade'
-const CLASS_NAME_SHOW = 'show'
 
-const EVENT_MOUSEDOWN = `mousedown.bs.${NAME}`
+/**
+ * Class definition
+ */
 
 class Backdrop {
   constructor(config) {
@@ -36,6 +44,7 @@ class Backdrop {
     this._element = null
   }
 
+  // Public
   show(callback) {
     if (!this._config.isVisible) {
       execute(callback)
@@ -69,8 +78,18 @@ class Backdrop {
     })
   }
 
-  // Private
+  dispose() {
+    if (!this._isAppended) {
+      return
+    }
 
+    EventHandler.off(this._element, EVENT_MOUSEDOWN)
+
+    this._element.remove()
+    this._isAppended = false
+  }
+
+  // Private
   _getElement() {
     if (!this._element) {
       const backdrop = document.createElement('div')
@@ -111,17 +130,6 @@ class Backdrop {
     this._isAppended = true
   }
 
-  dispose() {
-    if (!this._isAppended) {
-      return
-    }
-
-    EventHandler.off(this._element, EVENT_MOUSEDOWN)
-
-    this._element.remove()
-    this._isAppended = false
-  }
-
   _emulateAnimation(callback) {
     executeAfterTransition(callback, this._getElement(), this._config.isAnimated)
   }
diff --git a/js/src/util/focustrap.js b/js/src/util/focustrap.js
index 44d5f47ebf..a1975f4899 100644
--- a/js/src/util/focustrap.js
+++ b/js/src/util/focustrap.js
@@ -9,15 +9,9 @@ import EventHandler from '../dom/event-handler'
 import SelectorEngine from '../dom/selector-engine'
 import { typeCheckConfig } from './index'
 
-const Default = {
-  trapElement: null, // The element to trap focus inside of
-  autofocus: true
-}
-
-const DefaultType = {
-  trapElement: 'element',
-  autofocus: 'boolean'
-}
+/**
+ * Constants
+ */
 
 const NAME = 'focustrap'
 const DATA_KEY = 'bs.focustrap'
@@ -29,6 +23,20 @@ const TAB_KEY = 'Tab'
 const TAB_NAV_FORWARD = 'forward'
 const TAB_NAV_BACKWARD = 'backward'
 
+const Default = {
+  trapElement: null, // The element to trap focus inside of
+  autofocus: true
+}
+
+const DefaultType = {
+  trapElement: 'element',
+  autofocus: 'boolean'
+}
+
+/**
+ * Class definition
+ */
+
 class FocusTrap {
   constructor(config) {
     this._config = this._getConfig(config)
@@ -36,6 +44,7 @@ class FocusTrap {
     this._lastTabNavDirection = null
   }
 
+  // Public
   activate() {
     const { trapElement, autofocus } = this._config
 
@@ -64,7 +73,6 @@ class FocusTrap {
   }
 
   // Private
-
   _handleFocusin(event) {
     const { target } = event
     const { trapElement } = this._config
diff --git a/js/src/util/index.js b/js/src/util/index.js
index 93f7223b12..0ba6ce6f8c 100644
--- a/js/src/util/index.js
+++ b/js/src/util/index.js
@@ -19,9 +19,7 @@ const toType = obj => {
 }
 
 /**
- * --------------------------------------------------------------------------
- * Public Util Api
- * --------------------------------------------------------------------------
+ * Public Util API
  */
 
 const getUID = prefix => {
@@ -113,7 +111,8 @@ const isElement = obj => {
 }
 
 const getElement = obj => {
-  if (isElement(obj)) { // it's a jQuery object or a node element
+  // it's a jQuery object or a node element
+  if (isElement(obj)) {
     return obj.jquery ? obj[0] : obj
   }
 
@@ -196,8 +195,7 @@ const noop = () => {}
  * @see https://www.charistheo.io/blog/2021/02/restart-a-css-animation-with-javascript/#restarting-a-css-animation
  */
 const reflow = element => {
-  // eslint-disable-next-line no-unused-expressions
-  element.offsetHeight
+  element.offsetHeight // eslint-disable-line no-unused-expressions
 }
 
 const getjQuery = () => {
@@ -312,24 +310,24 @@ const getNextActiveElement = (list, activeElement, shouldGetNext, isCycleAllowed
 }
 
 export {
+  defineJQueryPlugin,
+  execute,
+  executeAfterTransition,
+  findShadowRoot,
   getElement,
-  getUID,
-  getSelectorFromElement,
   getElementFromSelector,
+  getjQuery,
+  getNextActiveElement,
+  getSelectorFromElement,
   getTransitionDurationFromElement,
-  triggerTransitionEnd,
+  getUID,
+  isDisabled,
   isElement,
-  typeCheckConfig,
+  isRTL,
   isVisible,
-  isDisabled,
-  findShadowRoot,
   noop,
-  getNextActiveElement,
-  reflow,
-  getjQuery,
   onDOMContentLoaded,
-  isRTL,
-  defineJQueryPlugin,
-  execute,
-  executeAfterTransition
+  reflow,
+  triggerTransitionEnd,
+  typeCheckConfig
 }
diff --git a/js/src/util/scrollbar.js b/js/src/util/scrollbar.js
index 16e14d1f3c..55b7244ab3 100644
--- a/js/src/util/scrollbar.js
+++ b/js/src/util/scrollbar.js
@@ -9,14 +9,23 @@ import SelectorEngine from '../dom/selector-engine'
 import Manipulator from '../dom/manipulator'
 import { isElement } from './index'
 
+/**
+ * Constants
+ */
+
 const SELECTOR_FIXED_CONTENT = '.fixed-top, .fixed-bottom, .is-fixed, .sticky-top'
 const SELECTOR_STICKY_CONTENT = '.sticky-top'
 
+/**
+ * Class definition
+ */
+
 class ScrollBarHelper {
   constructor() {
     this._element = document.body
   }
 
+  // Public
   getWidth() {
     // https://developer.mozilla.org/en-US/docs/Web/API/Window/innerWidth#usage_notes
     const documentWidth = document.documentElement.clientWidth
@@ -33,6 +42,18 @@ class ScrollBarHelper {
     this._setElementAttributes(SELECTOR_STICKY_CONTENT, 'marginRight', calculatedValue => calculatedValue - width)
   }
 
+  reset() {
+    this._resetElementAttributes(this._element, 'overflow')
+    this._resetElementAttributes(this._element, 'paddingRight')
+    this._resetElementAttributes(SELECTOR_FIXED_CONTENT, 'paddingRight')
+    this._resetElementAttributes(SELECTOR_STICKY_CONTENT, 'marginRight')
+  }
+
+  isOverflowing() {
+    return this.getWidth() > 0
+  }
+
+  // Private
   _disableOverFlow() {
     this._saveInitialAttribute(this._element, 'overflow')
     this._element.style.overflow = 'hidden'
@@ -53,13 +74,6 @@ class ScrollBarHelper {
     this._applyManipulationCallback(selector, manipulationCallBack)
   }
 
-  reset() {
-    this._resetElementAttributes(this._element, 'overflow')
-    this._resetElementAttributes(this._element, 'paddingRight')
-    this._resetElementAttributes(SELECTOR_FIXED_CONTENT, 'paddingRight')
-    this._resetElementAttributes(SELECTOR_STICKY_CONTENT, 'marginRight')
-  }
-
   _saveInitialAttribute(element, styleProp) {
     const actualValue = element.style[styleProp]
     if (actualValue) {
@@ -90,10 +104,6 @@ class ScrollBarHelper {
       }
     }
   }
-
-  isOverflowing() {
-    return this.getWidth() > 0
-  }
 }
 
 export default ScrollBarHelper
diff --git a/js/src/util/swipe.js b/js/src/util/swipe.js
index a78f598d9d..87a5f7f5ae 100644
--- a/js/src/util/swipe.js
+++ b/js/src/util/swipe.js
@@ -1,6 +1,17 @@
+/**
+ * --------------------------------------------------------------------------
+ * Bootstrap (v5.1.3): util/swipe.js
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
+ * --------------------------------------------------------------------------
+ */
+
 import EventHandler from '../dom/event-handler'
 import { execute, typeCheckConfig } from './index'
 
+/**
+ * Constants
+ */
+
 const NAME = 'swipe'
 const EVENT_KEY = '.bs.swipe'
 const EVENT_TOUCHSTART = `touchstart${EVENT_KEY}`
@@ -25,6 +36,10 @@ const DefaultType = {
   endCallback: '(function|null)'
 }
 
+/**
+ * Class definition
+ */
+
 class Swipe {
   constructor(element, config) {
     this._element = element
@@ -39,10 +54,12 @@ class Swipe {
     this._initEvents()
   }
 
+  // Public
   dispose() {
     EventHandler.off(this._element, EVENT_KEY)
   }
 
+  // Private
   _start(event) {
     if (!this._supportPointerEvents) {
       this._deltaX = event.touches[0].clientX
@@ -114,6 +131,7 @@ class Swipe {
     return this._supportPointerEvents && (event.pointerType === POINTER_TYPE_PEN || event.pointerType === POINTER_TYPE_TOUCH)
   }
 
+  // Static
   static isSupported() {
     return 'ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0
   }