import { FirehoseClientConfig } from "@aws-sdk/client-firehose";
import { TransportStreamOptions } from "winston-transport";
import { MessageSender } from "./interfaces";
export type FormatterFunc = (message: any) => string;
export declare const DefaultFormatter: FormatterFunc;
export type FirehoseTransportOptions = TransportStreamOptions & {
    /**
     * Kinesis delivery stream name.
     *
     * @type {string}
     */
    streamName: string;
    /**
     * If set to true, the Kinesis Transport logger stream will inherit the logger's
     * overall log level. Otherwise the log level will default to 'info'.
     *
     * @type {boolean}
     */
    useLoggerLevel?: boolean;
    /**
     * If set to true, the Kinesis Transport log format will be inherited from the
     * overall logger's format specifcation. Otherwise, the log formatter will default
     * to JSON.stringify, and appends a timestamp.
     *
     * @type {boolean}
     */
    useLoggerFormat?: boolean;
    /**
     * Specify a custom formatter function. This overrides the behavior
     * of useLoggerFormat.
     *
     * @type {FormatterFunc}
     */
    formatter?: FormatterFunc;
    /**
     * Passes through these parameters directly to the Amazon AWS Firehose SDK.
     * These options are documented {@link http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/Firehose.html#constructor-property | here}.
     *
     * @type {FirehoseClientConfig}
     */
    firehoseOptions?: FirehoseClientConfig;
    /**
     * Injector parameter for mocking and testing.
     *
     * @private
     */
    firehoseSender?: MessageSender;
};