diff --git a/js/src/carousel.js b/js/src/carousel.js
index 06a391419..d38eb481d 100644
--- a/js/src/carousel.js
+++ b/js/src/carousel.js
@@ -251,7 +251,7 @@ class Carousel extends BaseComponent {
 
     // swipe left
     if (direction > 0) {
-      if (isRTL) {
+      if (isRTL()) {
         this.next()
       } else {
         this.prev()
@@ -260,7 +260,7 @@ class Carousel extends BaseComponent {
 
     // swipe right
     if (direction < 0) {
-      if (isRTL) {
+      if (isRTL()) {
         this.prev()
       } else {
         this.next()
@@ -348,14 +348,14 @@ class Carousel extends BaseComponent {
 
     if (event.key === ARROW_LEFT_KEY) {
       event.preventDefault()
-      if (isRTL) {
+      if (isRTL()) {
         this.next()
       } else {
         this.prev()
       }
     } else if (event.key === ARROW_RIGHT_KEY) {
       event.preventDefault()
-      if (isRTL) {
+      if (isRTL()) {
         this.prev()
       } else {
         this.next()
diff --git a/js/src/dropdown.js b/js/src/dropdown.js
index bada537c9..73c09c2f4 100644
--- a/js/src/dropdown.js
+++ b/js/src/dropdown.js
@@ -64,12 +64,12 @@ const SELECTOR_MENU = '.dropdown-menu'
 const SELECTOR_NAVBAR_NAV = '.navbar-nav'
 const SELECTOR_VISIBLE_ITEMS = '.dropdown-menu .dropdown-item:not(.disabled):not(:disabled)'
 
-const PLACEMENT_TOP = isRTL ? 'top-end' : 'top-start'
-const PLACEMENT_TOPEND = isRTL ? 'top-start' : 'top-end'
-const PLACEMENT_BOTTOM = isRTL ? 'bottom-end' : 'bottom-start'
-const PLACEMENT_BOTTOMEND = isRTL ? 'bottom-start' : 'bottom-end'
-const PLACEMENT_RIGHT = isRTL ? 'left-start' : 'right-start'
-const PLACEMENT_LEFT = isRTL ? 'right-start' : 'left-start'
+const PLACEMENT_TOP = isRTL() ? 'top-end' : 'top-start'
+const PLACEMENT_TOPEND = isRTL() ? 'top-start' : 'top-end'
+const PLACEMENT_BOTTOM = isRTL() ? 'bottom-end' : 'bottom-start'
+const PLACEMENT_BOTTOMEND = isRTL() ? 'bottom-start' : 'bottom-end'
+const PLACEMENT_RIGHT = isRTL() ? 'left-start' : 'right-start'
+const PLACEMENT_LEFT = isRTL() ? 'right-start' : 'left-start'
 
 const Default = {
   offset: 0,
diff --git a/js/src/modal.js b/js/src/modal.js
index fe1b5a4c6..25013ca3b 100644
--- a/js/src/modal.js
+++ b/js/src/modal.js
@@ -431,14 +431,13 @@ class Modal extends BaseComponent {
   // ----------------------------------------------------------------------
 
   _adjustDialog() {
-    const isModalOverflowing =
-      this._element.scrollHeight > document.documentElement.clientHeight
+    const isModalOverflowing = this._element.scrollHeight > document.documentElement.clientHeight
 
-    if ((!this._isBodyOverflowing && isModalOverflowing && !isRTL) || (this._isBodyOverflowing && !isModalOverflowing && isRTL)) {
+    if ((!this._isBodyOverflowing && isModalOverflowing && !isRTL()) || (this._isBodyOverflowing && !isModalOverflowing && isRTL())) {
       this._element.style.paddingLeft = `${this._scrollbarWidth}px`
     }
 
-    if ((this._isBodyOverflowing && !isModalOverflowing && !isRTL) || (!this._isBodyOverflowing && isModalOverflowing && isRTL)) {
+    if ((this._isBodyOverflowing && !isModalOverflowing && !isRTL()) || (!this._isBodyOverflowing && isModalOverflowing && isRTL())) {
       this._element.style.paddingRight = `${this._scrollbarWidth}px`
     }
   }
diff --git a/js/src/tooltip.js b/js/src/tooltip.js
index 63a30cf2f..77a4dcc3d 100644
--- a/js/src/tooltip.js
+++ b/js/src/tooltip.js
@@ -63,9 +63,9 @@ const DefaultType = {
 const AttachmentMap = {
   AUTO: 'auto',
   TOP: 'top',
-  RIGHT: isRTL ? 'left' : 'right',
+  RIGHT: isRTL() ? 'left' : 'right',
   BOTTOM: 'bottom',
-  LEFT: isRTL ? 'right' : 'left'
+  LEFT: isRTL() ? 'right' : 'left'
 }
 
 const Default = {
@@ -533,7 +533,11 @@ class Tooltip extends BaseComponent {
 
     triggers.forEach(trigger => {
       if (trigger === 'click') {
-        EventHandler.on(this._element, this.constructor.Event.CLICK, this.config.selector, event => this.toggle(event)
+        EventHandler.on(
+          this._element,
+          this.constructor.Event.CLICK,
+          this.config.selector,
+          event => this.toggle(event)
         )
       } else if (trigger !== TRIGGER_MANUAL) {
         const eventIn = trigger === TRIGGER_HOVER ?
diff --git a/js/src/util/index.js b/js/src/util/index.js
index 22d0a578b..2f0398003 100644
--- a/js/src/util/index.js
+++ b/js/src/util/index.js
@@ -185,7 +185,7 @@ const onDOMContentLoaded = callback => {
   }
 }
 
-const isRTL = document.documentElement.dir === 'rtl'
+const isRTL = () => document.documentElement.dir === 'rtl'
 
 const defineJQueryPlugin = (name, plugin) => {
   onDOMContentLoaded(() => {