/**
 * @license
 * Copyright Noémi Salaün All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://github.com/noemi-salaun/ng-logger/blob/master/LICENSE
 */
import { InjectionToken } from '@angular/core';
import { Level } from './level.enum';
import * as i0 from "@angular/core";
/**
 * Created by Noémi Salaün on 09/17/2016.
 */
/**
 * The token to provide the log {@link Level}.
 */
export declare const LOGGER_LEVEL: InjectionToken<Level>;
/**
 * A logger service that provide the same functions as {@link console}.
 * The logger is binded to the console, so the Web Console shows the correct file and line number of the original call.
 */
export declare class Logger {
    /**
     * The log level.
     */
    private readonly _level;
    /**
     * Outputs a message to the Web Console.
     * @param message A JavaScript string containing zero or more substitution strings.
     * @param optionalParams A list of JavaScript objects to output
     *                       OR JavaScript objects with which to replace substitution strings within message.
     */
    log: (message?: any, ...optionalParams: any[]) => void;
    /**
     * Outputs a debugging message to the Web Console.
     * @param message A JavaScript string containing zero or more substitution strings.
     * @param optionalParams A list of JavaScript objects to output
     *                       OR JavaScript objects with which to replace substitution strings within message.
     */
    debug: (message?: any, ...optionalParams: any[]) => void;
    /**
     * Outputs an informational message to the Web Console.
     * @param message A JavaScript string containing zero or more substitution strings.
     * @param optionalParams A list of JavaScript objects to output
     *                       OR JavaScript objects with which to replace substitution strings within message.
     */
    info: (message?: any, ...optionalParams: any[]) => void;
    /**
     * Outputs a warning message to the Web Console.
     * @param message A JavaScript string containing zero or more substitution strings.
     * @param optionalParams A list of JavaScript objects to output
     *                       OR JavaScript objects with which to replace substitution strings within message.
     */
    warn: (message?: any, ...optionalParams: any[]) => void;
    /**
     * Outputs an error message to the Web Console.
     * @param message A JavaScript string containing zero or more substitution strings.
     * @param optionalParams A list of JavaScript objects to output
     *                       OR JavaScript objects with which to replace substitution strings within message.
     */
    error: (message?: any, ...optionalParams: any[]) => void;
    /**
     * Creates a new inline group in the Web Console log.
     * @param groupTitle An optional title for the group.
     */
    group: (groupTitle?: string) => void;
    /**
     * Creates a new inline group in the Web Console log that is initially collapsed.
     * @param groupTitle An optional title for the group.
     */
    groupCollapsed: (groupTitle?: string) => void;
    /**
     * Exits the current inline group in the Web Console.
     */
    groupEnd: () => void;
    /**
     * Starts a timer you can use to track how long an operation takes.
     * It works only with log {@link Level} equal or higher than DEBUG.
     *
     * @param timerName The name to give the new timer. This will identify the timer.
     */
    time: (timerName?: string) => void;
    /**
     * Stops a timer that was previously started by calling {@link Logger.time}.
     * It works only with log {@link Level} equal or higher than DEBUG.
     *
     * @param timerName The name of the timer to stop. Once stopped, the elapsed time is automatically displayed in the Web Console.
     */
    timeEnd: (timerName?: string) => void;
    /**
     * Returns the log level.
     */
    get level(): Level;
    constructor(level: Level);
    static ɵfac: i0.ɵɵFactoryDeclaration<Logger, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<Logger>;
}