src/vs/platform/storage/browser/storageService.ts/IndexedDBStorageDatabase/clear
class IndexedDBStorageDatabase:	clear(): Promise<void> {
		return new Promise<void>(async (resolve, reject) => {
			const db = await this.whenConnected;

			const transaction = db.transaction(IndexedDBStorageDatabase.STORAGE_OBJECT_STORE, 'readwrite');
			transaction.oncomplete = () => resolve();
			transaction.onerror = () => reject(transaction.error);

			// Clear every row in the `ItemTable`
			const objectStore = transaction.objectStore(IndexedDBStorageDatabase.STORAGE_OBJECT_STORE);
			objectStore.clear();
		});
	}