/**
 * @module common/logging
 */
import { LogLevel } from './log-level';
import { LogProvider } from './log-provider';
/**
 * A static singleton class used to expose the logging mechanism.
 *
 * Logging is provided through the use of a logging chain. When `log`
 * is called, the logger iterates over each logger in the chain calling
 * `log` on each individual logger.
 */
export declare class Logger {
    static loggers: LogProvider[];
    /**
     * Adds a new logger to the end of the logging chain.
     */
    static addLogger(logger: LogProvider): void;
    /**
     * Clears the logging chain.
     */
    static resetLoggers(): void;
    /**
     * Logs a message using each logger in the chain.
     * @param sender The sender of the message.
     * @param message The message.
     * @param level The level of the message.
     */
    static log(sender: string, message: string, level?: LogLevel): void;
}