/**
 * @license
 * Copyright Alibaba.com 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/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
 */
import { InjectionToken, Provider } from '@angular/core';
export declare const NZ_LOGGER_STATE: InjectionToken<boolean>;
export declare class LoggerService {
    private _loggerState;
    constructor(_loggerState: boolean);
    log(...args: any[]): void;
    warn(...args: any[]): void;
    error(...args: any[]): void;
    info(...args: any[]): void;
    debug(...args: any[]): void;
}
export declare function LOGGER_SERVICE_PROVIDER_FACTORY(exist: LoggerService, loggerState: boolean): LoggerService;
export declare const LOGGER_SERVICE_PROVIDER: Provider;