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

js/src/base-component.js

@@ -13,13 +13,15 @@ import {
 import EventHandler from './dom/event-handler'
 
 /**
- * ------------------------------------------------------------------------
  * Constants
- * ------------------------------------------------------------------------
  */
 
 const VERSION = '5.1.3'
 
+/**
+ * Class definition
+ */
+
 class BaseComponent {
   constructor(element) {
     element = getElement(element)
@@ -32,6 +34,7 @@ class BaseComponent {
     Data.set(this._element, this.constructor.DATA_KEY, this)
   }
 
+  // Public
   dispose() {
     Data.remove(this._element, this.constructor.DATA_KEY)
     EventHandler.off(this._element, this.constructor.EVENT_KEY)
@@ -45,8 +48,7 @@ class BaseComponent {
     executeAfterTransition(callback, element, isAnimated)
   }
 
-  /** Static */
-
+  // Static
   static getInstance(element) {
     return Data.get(getElement(element), this.DATA_KEY)
   }
@@ -60,7 +62,7 @@ class BaseComponent {
   }
 
   static get NAME() {
-    throw new Error('You have to implement the static method "NAME", for each component!')
+    throw new Error('You have to implement the static method "NAME" for each component!')
   }
 
   static get DATA_KEY() {