Add deleteAll (#13)

* Add deleteAll

* Make semistandard happy.

* add test case

* PR Comments.

src/feed-store.js

@@ -309,6 +309,17 @@ export class FeedStore extends EventEmitter {
     return descriptor.close();
   }
 
+  /**
+   * Remove all descriptors from the indexDB.
+   *
+   * NOTE: This operation would not close the feeds.
+   *
+   * @returns {Promise<Promise[]>}
+   */
+  async deleteAllDescriptors () {
+    return Promise.all(this.getDescriptors().map(({ path }) => this.deleteDescriptor(path)));
+  }
+
   /**
    * Remove a descriptor from the indexDB by the path.
    *

src/feed-store.test.js

@@ -495,4 +495,10 @@ describe('FeedStore', () => {
       resolve();
     }));
   });
+
+  test('Delete all', async () => {
+    expect(feedStore.getDescriptors().length).toBe(2);
+    await feedStore.deleteAllDescriptors();
+    expect(feedStore.getDescriptors().length).toBe(0);
+  });
 });