diff --git a/components/CacheUpdateManager.tsx b/components/CacheUpdateManager.tsx
index 4517f42..a5fa16b 100644
--- a/components/CacheUpdateManager.tsx
+++ b/components/CacheUpdateManager.tsx
@@ -75,7 +75,7 @@ function createUpdateHandler(
 
 function Spinner(): React.ReactElement {
   return (
-    <div className="inline-block animate-spin rounded-full h-4 w-4 border-2 border-neon-cyan border-t-transparent mr-2"></div>
+    <div className="inline-block animate-spin rounded-full h-4 w-4 border-2 border-neon-cyan border-t-transparent mr-2" />
   )
 }
 
diff --git a/lib/storage/indexedDB.ts b/lib/storage/indexedDB.ts
index 58e2e6e..c334891 100644
--- a/lib/storage/indexedDB.ts
+++ b/lib/storage/indexedDB.ts
@@ -50,16 +50,16 @@ export class IndexedDBStorage {
 
       const request = indexedDB.open(DB_NAME, DB_VERSION)
 
-      request.onerror = () => {
+      request.onerror = (): void => {
         reject(new Error(`Failed to open IndexedDB: ${request.error}`))
       }
 
-      request.onsuccess = () => {
+      request.onsuccess = (): void => {
         this.db = request.result
         resolve()
       }
 
-      request.onupgradeneeded = (event) => {
+      request.onupgradeneeded = (event): void => {
         const db = (event.target as IDBOpenDBRequest).result
 
         if (!db.objectStoreNames.contains(STORE_NAME)) {
@@ -101,8 +101,12 @@ export class IndexedDBStorage {
         const store = transaction.objectStore(STORE_NAME)
         const request = store.put(data)
 
-        request.onsuccess = () => resolve()
-        request.onerror = () => reject(new Error(`Failed to store data: ${request.error}`))
+        request.onsuccess = (): void => {
+          resolve()
+        }
+        request.onerror = (): void => {
+          reject(new Error(`Failed to store data: ${request.error}`))
+        }
       })
     } catch (error) {
       console.error('Error storing in IndexedDB:', error)
@@ -139,7 +143,7 @@ export class IndexedDBStorage {
       const store = transaction.objectStore(STORE_NAME)
       const request = store.get(key)
 
-      request.onsuccess = () => {
+      request.onsuccess = (): void => {
         const result = request.result as DBData | undefined
 
         if (!result) {
@@ -154,14 +158,18 @@ export class IndexedDBStorage {
         }
 
         decryptPayload<T>(secret, result.data)
-          .then((value) => resolve(value))
+          .then((value) => {
+            resolve(value)
+          })
           .catch((error) => {
             console.error('Error decrypting from IndexedDB:', error)
             resolve(null)
           })
       }
 
-      request.onerror = () => reject(new Error(`Failed to get data: ${request.error}`))
+      request.onerror = (): void => {
+        reject(new Error(`Failed to get data: ${request.error}`))
+      }
     })
   }
 
@@ -183,8 +191,12 @@ export class IndexedDBStorage {
         const store = transaction.objectStore(STORE_NAME)
         const request = store.delete(key)
 
-        request.onsuccess = () => resolve()
-        request.onerror = () => reject(new Error(`Failed to delete data: ${request.error}`))
+        request.onsuccess = (): void => {
+          resolve()
+        }
+        request.onerror = (): void => {
+          reject(new Error(`Failed to delete data: ${request.error}`))
+        }
       })
     } catch (error) {
       console.error('Error deleting from IndexedDB:', error)
@@ -211,7 +223,7 @@ export class IndexedDBStorage {
         const index = store.index('expiresAt')
         const request = index.openCursor(IDBKeyRange.upperBound(Date.now()))
 
-        request.onsuccess = (event) => {
+        request.onsuccess = (event): void => {
           const cursor = (event.target as IDBRequest).result
           if (cursor) {
             cursor.delete()
@@ -221,7 +233,9 @@ export class IndexedDBStorage {
           }
         }
 
-        request.onerror = () => reject(new Error(`Failed to clear expired: ${request.error}`))
+        request.onerror = (): void => {
+          reject(new Error(`Failed to clear expired: ${request.error}`))
+        }
       })
     } catch (error) {
       console.error('Error clearing expired entries:', error)
diff --git a/lib/userContentSync.ts b/lib/userContentSync.ts
index 210795e..ea45ba0 100644
--- a/lib/userContentSync.ts
+++ b/lib/userContentSync.ts
@@ -41,10 +41,10 @@ async function fetchAndCachePublications(
 
   const events: Event[] = []
 
-  return new Promise((resolve) => {
+  return new Promise<void>((resolve) => {
     let finished = false
 
-    const done = async () => {
+    const done = async (): Promise<void> => {
       if (finished) {
         return
       }
@@ -89,18 +89,18 @@ async function fetchAndCachePublications(
       resolve()
     }
 
-    sub.on('event', (event: Event) => {
+    sub.on('event', (event: Event): void => {
       const tags = extractTagsFromEvent(event)
       if (tags.type === 'publication' && !tags.hidden) {
         events.push(event)
       }
     })
 
-    sub.on('eose', () => {
+    sub.on('eose', (): void => {
       void done()
     })
 
-    setTimeout(() => {
+    setTimeout((): void => {
       void done()
     }, 10000).unref?.()
   })
@@ -132,10 +132,10 @@ async function fetchAndCacheSeries(
 
   const events: Event[] = []
 
-  return new Promise((resolve) => {
+  return new Promise<void>((resolve) => {
     let finished = false
 
-    const done = async () => {
+    const done = async (): Promise<void> => {
       if (finished) {
         return
       }
@@ -180,18 +180,18 @@ async function fetchAndCacheSeries(
       resolve()
     }
 
-    sub.on('event', (event: Event) => {
+    sub.on('event', (event: Event): void => {
       const tags = extractTagsFromEvent(event)
       if (tags.type === 'series' && !tags.hidden) {
         events.push(event)
       }
     })
 
-    sub.on('eose', () => {
+    sub.on('eose', (): void => {
       void done()
     })
 
-    setTimeout(() => {
+    setTimeout((): void => {
       void done()
     }, 10000).unref?.()
   })
@@ -220,10 +220,10 @@ async function fetchAndCachePurchases(
 
   const events: Event[] = []
 
-  return new Promise((resolve) => {
+  return new Promise<void>((resolve) => {
     let finished = false
 
-    const done = async () => {
+    const done = async (): Promise<void> => {
       if (finished) {
         return
       }
@@ -248,15 +248,15 @@ async function fetchAndCachePurchases(
       resolve()
     }
 
-    sub.on('event', (event: Event) => {
+    sub.on('event', (event: Event): void => {
       events.push(event)
     })
 
-    sub.on('eose', () => {
+    sub.on('eose', (): void => {
       void done()
     })
 
-    setTimeout(() => {
+    setTimeout((): void => {
       void done()
     }, 10000).unref?.()
   })
@@ -285,10 +285,10 @@ async function fetchAndCacheSponsoring(
 
   const events: Event[] = []
 
-  return new Promise((resolve) => {
+  return new Promise<void>((resolve) => {
     let finished = false
 
-    const done = async () => {
+    const done = async (): Promise<void> => {
       if (finished) {
         return
       }
@@ -310,15 +310,15 @@ async function fetchAndCacheSponsoring(
       resolve()
     }
 
-    sub.on('event', (event: Event) => {
+    sub.on('event', (event: Event): void => {
       events.push(event)
     })
 
-    sub.on('eose', () => {
+    sub.on('eose', (): void => {
       void done()
     })
 
-    setTimeout(() => {
+    setTimeout((): void => {
       void done()
     }, 10000).unref?.()
   })
@@ -347,10 +347,10 @@ async function fetchAndCacheReviewTips(
 
   const events: Event[] = []
 
-  return new Promise((resolve) => {
+  return new Promise<void>((resolve) => {
     let finished = false
 
-    const done = async () => {
+    const done = async (): Promise<void> => {
       if (finished) {
         return
       }
@@ -372,15 +372,15 @@ async function fetchAndCacheReviewTips(
       resolve()
     }
 
-    sub.on('event', (event: Event) => {
+    sub.on('event', (event: Event): void => {
       events.push(event)
     })
 
-    sub.on('eose', () => {
+    sub.on('eose', (): void => {
       void done()
     })
 
-    setTimeout(() => {
+    setTimeout((): void => {
       void done()
     }, 10000).unref?.()
   })