import { LoggerInterface, LogLevel } from './LoggerInterface';
import { AbstractLogLevelLogger } from './AbstractLogLevelLogger';
import { Moment } from 'moment';
export declare class PrefixDateLogger extends AbstractLogLevelLogger implements LoggerInterface {
    private readonly logger;
    private readonly format;
    private readonly separator;
    private readonly now;
    constructor(logger: LoggerInterface, format?: string, separator?: string, now?: () => Moment);
    log(level: LogLevel, message?: any, ...optionalParams: any[]): void;
    private formatDate;
}