refactor: Improve LRU cache handling and code formatting

src/cache.ts

@@ -22,7 +22,9 @@ class LRUCache<K, V> {
       this.cache.delete(key);
     } else if (this.cache.size >= this.maxSize) {
       const firstKey = this.cache.keys().next().value;
-      this.cache.delete(firstKey);
+      if (firstKey !== undefined) {
+        this.cache.delete(firstKey);
+      }
     }
     this.cache.set(key, value);
   }
@@ -41,11 +43,11 @@ interface CacheMetadata {
 
 const DEFAULT_CACHE_SIZE = 100;
 export interface ICache {
-    getAudioBuffer(context: AudioContext, url: string): Promise<AudioBuffer>;
-    clearMemoryCache(): void;
+  getAudioBuffer(context: AudioContext, url: string): Promise<AudioBuffer>;
+  clearMemoryCache(): void;
 }
 
-export class AudioCache  implements ICache {
+export class AudioCache implements ICache {
   private static pendingRequests = new Map<string, Promise<AudioBuffer>>();
   private static decodedBuffers = new LRUCache<string, AudioBuffer>(
     DEFAULT_CACHE_SIZE