diff --git a/packages/endpoint-micropub/lib/update.js b/packages/endpoint-micropub/lib/update.js
index 5bdcf31d8..102db7c95 100644
--- a/packages/endpoint-micropub/lib/update.js
+++ b/packages/endpoint-micropub/lib/update.js
@@ -97,7 +97,7 @@ export const deleteEntries = (object, deletions) => {
 
       for (const value of valuesToDelete) {
         const index = values.indexOf(value);
-        if (index > -1) {
+        if (index !== -1) {
           values.splice(index, 1);
         }
 
diff --git a/packages/frontend/components/character-count/index.js b/packages/frontend/components/character-count/index.js
index 9ce869f2a..3dc3a662d 100644
--- a/packages/frontend/components/character-count/index.js
+++ b/packages/frontend/components/character-count/index.js
@@ -77,7 +77,7 @@ export const CharacterCountComponent = class extends HTMLElement {
    * @access private
    */
   #handleFocus() {
-    this.valueChecker = window.setInterval(() => {
+    this.valueChecker = globalThis.setInterval(() => {
       if (
         !this.lastInputTimestamp ||
         Date.now() - 500 >= this.lastInputTimestamp
@@ -93,7 +93,7 @@ export const CharacterCountComponent = class extends HTMLElement {
    */
   #handleBlur() {
     if (this.valueChecker) {
-      window.clearInterval(this.valueChecker);
+      globalThis.clearInterval(this.valueChecker);
     }
   }
 
diff --git a/packages/frontend/components/share-preview/index.js b/packages/frontend/components/share-preview/index.js
index 1ac35100e..04febbd32 100644
--- a/packages/frontend/components/share-preview/index.js
+++ b/packages/frontend/components/share-preview/index.js
@@ -16,8 +16,8 @@ export const SharePreviewComponent = class extends HTMLElement {
     if (this.$form) {
       const { scrollWidth, scrollHeight } = this.$form;
 
-      const chromeWidth = window.outerWidth - window.innerWidth;
-      const chromeHeight = window.outerHeight - window.innerHeight;
+      const chromeWidth = globalThis.outerWidth - window.innerWidth;
+      const chromeHeight = globalThis.outerHeight - window.innerHeight;
 
       const width = scrollWidth + chromeWidth;
       const height = scrollHeight + chromeHeight;
diff --git a/packages/frontend/lib/serviceworker.js b/packages/frontend/lib/serviceworker.js
index b2b3beef7..5c5004d49 100644
--- a/packages/frontend/lib/serviceworker.js
+++ b/packages/frontend/lib/serviceworker.js
@@ -91,7 +91,7 @@ self.addEventListener("install", async (event) => {
     (async () => {
       await updateAssetCache();
       await cacheClients();
-      self.skipWaiting();
+      globalThis.skipWaiting();
     })(),
   );
 });