import { ILayout, LogEvent, TCreateConverter, TPatternConverter } from './typings';
/**
 * Pattern layout for logging messages (根据指定模版格式化日志内容)
 */
export default class PatternLayout implements ILayout {
    private readonly converters;
    /**
     * Constructor (构造函数)
     * @param pattern Pattern string (模版字符串)
     */
    constructor(pattern?: string, createConverter?: TCreateConverter);
    /**
     * Add a converter (添加转换器)
     * @param fn Converter function (转换器函数)
     */
    use(fn: TPatternConverter): this;
    /**
     * Format a log event (格式化日志事件)
     * @param event Log event (日志事件)
     */
    format(event: LogEvent): string;
}