import { EventEmitter } from "@angular/core";
import * as log4javascript from "log4javascript";
import { AjaxAppenderConfiguration } from "./ajax-appender.configuration";
/**
 * An appender which sends the log messages to a server via HTTP.
 *
 * A typical configuration could be:
 *
 * ```json
 * {
 *   "url": "https://my.backend.xy/LoggingBackend",
 *   "batchSize": 10,
 *   "timerInterval": 60000,
 *   "threshold": "INFO"
 * }
 * ```
 */
export declare class AjaxAppender extends log4javascript.Appender {
    private static batchSizeDefault;
    private static timerIntervalDefault;
    private static thresholdDefault;
    /**
     * Event triggered when the appender could not send log messages to the server.
     *
     * @param message error message
     */
    appenderFailed: EventEmitter<string>;
    private ajaxAppender;
    private url;
    private withCredentials;
    /**
     * Creates a new instance of the appender.
     *
     * @param configuration configuration for the appender.
     */
    constructor(configuration: AjaxAppenderConfiguration);
    /**
     * Configures the logging depending on the given configuration.
     *
     * Only the defined properties get overwritten.
     * Neither url nor withCredentials can be modified.
     *
     * @param configuration configuration data.
     */
    configure(configuration: AjaxAppenderConfiguration): void;
    /**
     * Appender-specific method to append a log message.
     *
     * @param loggingEvent event to be appended.
     */
    append(loggingEvent: log4javascript.LoggingEvent): void;
    /**
     * Gets the appender's name.
     * Mainly for unit testing purposes.
     *
     * @return appender's name
     */
    toString(): string;
    /**
     * Get the internally used appender.
     * Mainly for unit testing purposes.
     */
    getInternalAppender(): log4javascript.AjaxAppender;
    /**
     * Returns the number of log messages sent in each request.
     */
    getBatchSize(): number;
    /**
     * Sets the number of log messages to send in each request.
     *
     * @param batchSize new batch size
     */
    setBatchSize(batchSize: number): void;
    /**
     * Returns the appender's layout.
     */
    getLayout(): log4javascript.Layout;
    /**
     * Sets the appender's layout.
     */
    setLayout(layout: log4javascript.Layout): void;
    /**
     * Returns the length of time in milliseconds between each sending of queued log messages.
     */
    getTimerInterval(): number;
    /**
     * Sets the length of time in milliseconds between each sending of queued log messages.
     *
     * @param timerInterval new timer interval
     */
    setTimerInterval(timerInterval: number): void;
}