src/vs/platform/storage/browser/storageService.ts/IndexedDBStorageDatabase/getItems
class IndexedDBStorageDatabase:	async getItems(): Promise<Map<string, string>> {
		const db = await this.whenConnected;

		function isValid(value: unknown): value is string {
			return typeof value === 'string';
		}

		return db.getKeyValues<string>(IndexedDBStorageDatabase.STORAGE_OBJECT_STORE, isValid);
	}