diff --git a/.eslintrc.yml b/.eslintrc.yml
index 2cfc4ef..3eaa9c5 100644
--- a/.eslintrc.yml
+++ b/.eslintrc.yml
@@ -20,6 +20,28 @@ rules:
   no-unused-vars:
     - error
     - argsIgnorePattern: "^_"
+  # Rules from GJS Style Guide regarding whitespace.
+  # See here: https://gjs.guide/guides/gjs/style-guide.html#whitespace
+  func-call-spacing:
+    - error
+    - never
+  array-bracket-spacing:
+    - error
+    - never
+  space-before-function-paren:
+    - error
+    - never
+  space-before-blocks:
+    - error
+    - always
+  key-spacing:
+    - error
+    - beforeColon: false
+      afterColon: true
+      mode: strict
+  object-curly-spacing:
+    - error
+    - always
 globals:
   imports: readonly
   log: readonly
diff --git a/src/extension.js b/src/extension.js
index e4bdd65..2e84736 100644
--- a/src/extension.js
+++ b/src/extension.js
@@ -26,7 +26,7 @@ class Extension {
         this.#overwritePanelAddToPanelBox();
 
         // Handle changes of configured box orders.
-        this._settingsHandlerIds = [ ];
+        this._settingsHandlerIds = [];
 
         const addConfiguredBoxOrderChangeHandler = (box) => {
             let handlerId = this.settings.connect(`changed::${box}-box-order`, () => {
@@ -98,7 +98,7 @@ class Extension {
         };
 
         // Overwrite `Panel._addToPanelBox`.
-        Panel.Panel.prototype._addToPanelBox = function (role, indicator, position, box) {
+        Panel.Panel.prototype._addToPanelBox = function(role, indicator, position, box) {
             // Simply call the original `_addToPanelBox` and order the top bar
             // and handle new items afterwards.
             this._originalAddToPanelBox(role, indicator, position, box);
diff --git a/src/extensionModules/BoxOrderManager.js b/src/extensionModules/BoxOrderManager.js
index b178e00..82c18d3 100644
--- a/src/extensionModules/BoxOrderManager.js
+++ b/src/extensionModules/BoxOrderManager.js
@@ -80,7 +80,7 @@ var BoxOrderManager = GObject.registerClass({
             }
         } else {
             // Otherwise create a new array.
-            this._appIndicatorItemApplicationRoleMap.set(application, [ role ]);
+            this._appIndicatorItemApplicationRoleMap.set(application, [role]);
         }
 
         // Return the placeholder.
@@ -97,7 +97,7 @@ var BoxOrderManager = GObject.registerClass({
      * resolved/replaced to/with actual roles.
      */
     #resolveAppIndicatorPlaceholders(boxOrder) {
-        let resolvedBoxOrder = [ ];
+        let resolvedBoxOrder = [];
         for (const role of boxOrder) {
             // If the role isn't a placeholder, just add it to the resolved box
             // order.
@@ -171,7 +171,7 @@ var BoxOrderManager = GObject.registerClass({
         // Go through the box order and only add items to the valid box order,
         // where their indicator is present in the Gnome Shell top bar
         // currently.
-        let validBoxOrder = [ ];
+        let validBoxOrder = [];
         for (const role of boxOrder) {
             // Get the indicator container associated with the current role.
             const associatedIndicatorContainer = Main.panel.statusArea[role]?.container;
diff --git a/src/prefsModules/PrefsBoxOrderListBox.js b/src/prefsModules/PrefsBoxOrderListBox.js
index 832c720..1da5fe7 100644
--- a/src/prefsModules/PrefsBoxOrderListBox.js
+++ b/src/prefsModules/PrefsBoxOrderListBox.js
@@ -64,7 +64,7 @@ var PrefsBoxOrderListBox = GObject.registerClass({
      * `PrefsBoxOrderItemRows`) to settings.
      */
     saveBoxOrderToSettings() {
-        let currentBoxOrder = [ ];
+        let currentBoxOrder = [];
         for (let potentialPrefsBoxOrderItemRow of this) {
             // Only process PrefsBoxOrderItemRows.
             if (potentialPrefsBoxOrderItemRow.constructor.$gtype.name !== "PrefsBoxOrderItemRow") continue;