import * as log4javascript from "log4javascript";
import { LogLevel } from "./log-level.model";
/**
 * Logger for writing log messages.
 */
export declare class Logger {
    private logger;
    /**
     * Creates a new instance of a logger.
     */
    constructor(logger?: string | any);
    /**
     * Get the log level.
     */
    getLogLevel(): LogLevel;
    /**
     * Set the log level.
     *
     * @param level the new log level
     */
    setLogLevel(level: LogLevel): void;
    /**
     * Logs a message at level TRACE.
     *
     * @param methodName name of the method
     * @param params optional parameters to be logged; objects will be formatted as JSON
     */
    trace(methodName: string, ...params: any[]): void;
    /**
     * Logs a message at level DEBUG.
     *
     * @param methodName name of the method
     * @param params optional parameters to be logged; objects will be formatted as JSON
     */
    debug(methodName: string, ...params: any[]): void;
    /**
     * Logs a message at level INFO.
     *
     * @param methodName name of the method
     * @param params optional parameters to be logged; objects will be formatted as JSON
     */
    info(methodName: string, ...params: any[]): void;
    /**
     * Logs a message at level WARN.
     *
     * @param methodName name of the method
     * @param params optional parameters to be logged; objects will be formatted as JSON
     */
    warn(methodName: string, ...params: any[]): void;
    /**
     * Logs a message at level ERROR.
     *
     * @param methodName name of the method
     * @param params optional parameters to be logged; objects will be formatted as JSON
     */
    error(methodName: string, ...params: any[]): void;
    /**
     * Logs a message at level FATAL.
     *
     * @param methodName name of the method
     * @param params optional parameters to be logged; objects will be formatted as JSON
     */
    fatal(methodName: string, ...params: any[]): void;
    /**
     * Logs the entry into a method.
     * The method name will be logged at level INFO, the parameters at level DEBUG.
     *
     * @param methodName name of the method
     * @param params optional parameters to be logged; objects will be formatted as JSON
     */
    entry(methodName: string, ...params: any[]): void;
    /**
     * Logs the exit of a method.
     * The method name will be logged at level INFO, the parameters at level DEBUG.
     *
     * @param methodName name of the method
     * @param params optional parameters to be logged; objects will be formatted as JSON
     */
    exit(methodName: string, ...params: any[]): void;
    /**
     * Formats the given argument.
     */
    formatArgument(arg: any): string;
    /**
     * Returns the internal Logger (for unit tests only).
     */
    getInternalLogger(): log4javascript.Logger;
}