import * as log4javascript from "log4javascript";
import { LocalStorageAppenderConfiguration } from "./local-storage-appender.configuration";
import { LogMessage } from "./log-message.model";
/**
 * An appender which stores the log messages in the browser's local storage.
 *
 * The messages are saved JSON-serialized.
 * You have to configure which key is used for storing the messages.
 *
 * A typical configuration could be:
 *
 * ```json
 * {
 *   "localStorageKey": "myLogs",
 *   "maxMessages": 500,
 *   "threshold": "INFO"
 * }
 * ```
 */
export declare class LocalStorageAppender extends log4javascript.Appender {
    private static maxMessagesDefault;
    private static thresholdDefault;
    private maxMessages;
    private localStorageKey;
    private logMessages;
    /**
     * Creates a new instance of the appender.
     *
     * @param configuration configuration for the appender.
     */
    constructor(configuration: LocalStorageAppenderConfiguration);
    /**
     * Load log messages from local storage which are stored there under the given key.
     *
     * @param localStorageKey local storage key
     * @return stored messages
     */
    static loadLogMessages(localStorageKey: string): LogMessage[];
    /**
     * Remove log messages from local storage which are stored there under the given key.
     *
     * @param localStorageKey local storage key
     */
    static removeLogMessages(localStorageKey: string): void;
    /**
     * Configures the logging depending on the given configuration.
     *
     * Only the defined properties get overwritten.
     * The localStorageKey cannot be modified.
     *
     * @param configuration configuration data.
     */
    configure(configuration: LocalStorageAppenderConfiguration): 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 key which is used to store the messages in the local storage.
     */
    getLocalStorageKey(): string;
    /**
     * Get the maximum number of messages which will be stored in local storage.
     */
    getMaxMessages(): number;
    /**
     * Set the maximum number of messages which will be stored in local storage.
     *
     * If the appender stores currently more messages than the new value allows, the oldest messages get removed.
     *
     * @param value new maximum number
     */
    setMaxMessages(value: number): void;
    /**
     * Gets all messages stored in local storage.
     * Mainly for unit testing purposes.
     *
     * @return stored messages
     */
    getLogMessages(): LogMessage[];
    /**
     * Removes all messages from local storage.
     * Mainly for unit testing purposes.
     */
    clearLog(): void;
}