export declare function isIDBObjectStore(subject: unknown): subject is IDBObjectStore;
export declare function isIDBDatabase(subject: unknown): subject is IDBDatabase;
export declare function getCommandArguments<T>(key: IDBValidKey | IDBKeyRange | null, value: T | undefined): [T, IDBValidKey | IDBKeyRange] | [IDBValidKey | IDBKeyRange] | [T];