import { DocumentClient } from 'aws-sdk/clients/dynamodb';
import { TableConfig } from '../types';
/**
 * Checks if an item with a given pk sk combo exists in DB or not
 * @param pk partition key value
 * @param sk sort key value
 * @returns {Boolean} exists or not
 */
export declare function exists(dbClient: DocumentClient, table: TableConfig, key: DocumentClient.Key): Promise<boolean>;