feat: delete CacheStorage.delete() API (#7)

.changeset/polite-dryers-add.md

@@ -0,0 +1,5 @@
+---
+"@web-widget/shared-cache": minor
+---
+
+Delete `CacheStorage.delete()` API.

README.md

@@ -167,9 +167,9 @@ The `CacheStorage` class implements [CacheStorage](https://developer.mozilla.org
 
 Returns a Promise that resolves to the Cache object matching the cacheName (a new cache is created if it doesn't already exist.) This method follows the specification.
 
-### `delete`
+### ~~`delete`~~
 
-Finds the Cache object matching the cacheName, and if found, deletes the Cache object and returns a Promise that resolves to true. If no Cache object is found, it resolves to false. This method follows the specification.
+`SharedCache` didn't implement it.
 
 ### ~~`match`~~
 

src/cache-storage.ts

@@ -11,19 +11,9 @@ export class SharedCacheStorage implements CacheStorage {
     this.#options = options;
   }
 
-  /**
-   * The delete() method of the CacheStorage interface finds the Cache object
-   * matching the cacheName, and if found, deletes the Cache object and returns
-   * a Promise that resolves to true. If no Cache object is found, it resolves
-   * to false.
-   * @param cacheName The name of the cache you want to delete.
-   */
-  async delete(cacheName: string): Promise<boolean> {
-    const hasCache = this.#caches.has(cacheName);
-    if (hasCache) {
-      this.#caches.delete(cacheName);
-    }
-    return hasCache;
+  /** @private */
+  async delete(_cacheName: string): Promise<boolean> {
+    throw new Error('Not Implemented.');
   }
 
   /** @private */