import { ClickHouseClient } from '@clickhouse/client';
import { IAuditLog, IAuditLogClickHouseExporterOption, IAuditLogExporter } from '../audit-log.interface';
export declare class AuditlogClickHouseExporter implements IAuditLogExporter {
    private readonly databaseName;
    private readonly logExpired;
    private readonly auditLogTableName;
    private readonly options;
    private client?;
    constructor(options: IAuditLogClickHouseExporterOption);
    clone(): IAuditLogExporter;
    createClickhouseClient(): ClickHouseClient;
    getClient(): ClickHouseClient | undefined;
    startup(): Promise<void>;
    shutdown(): Promise<void>;
    sendAuditLog(log: IAuditLog): Promise<void>;
    /**
     * the transformation function to convert audit log object to readable log body string
     *
     * @param log audit log
     * @returns log body
     */
    customLoggerBodyTransformation(log: IAuditLog): string;
    private padTo2Digits;
    private formatDateToUTC;
}