/**
 * @license
 * Copyright (c) 2019 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt
 * The complete set of authors may be found at
 * http://polymer.github.io/AUTHORS.txt
 * The complete set of contributors may be found at
 * http://polymer.github.io/CONTRIBUTORS.txt
 * Code distributed by Google as part of the polymer project is also
 * subject to an additional IP rights grant found at
 * http://polymer.github.io/PATENTS.txt
 */
export declare type LogLevel = 'debug' | 'info' | 'error' | 'warn';
export declare type LogFunction = typeof console.debug;
export declare type Logger = {
    [key in LogLevel]?: LogFunction;
};
export declare const prefixedLogger: (prefix: string, logger: Logger) => Logger;
export declare const leveledLogger: (logger: Logger, minimumLogLevel: LogLevel) => Logger;
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