export declare enum Level {
    debug = 0,
    info = 1,
    warn = 2,
    error = 3
}
export interface LoggerOptions {
    /**
     * debug => contain debug, info, warn, error
     * info  => contain info, warn, error
     * warn  => contain warn, error
     * error => contain error
     */
    level: LogFunctionNames;
    /**
     * Example: server, => server-error.log, server-info.log, server-warn.log, server-debug.log
     */
    filename?: string;
    /**
     * log file will be store in sub folder base on each day
     * Example:
     *  {folderPath}/{dateformat||YYYYMMDD}/{filename}-{logLevel}.log
     *  {folderPath}/{dateformat||YYYYMMDD}/{filename}-{logLevel}-[index].log
     */
    folderPath?: string;
    maxSizePerFile?: number;
    dateFormat?: string;
    numberExpiredDay?: number;
}
export type LogFunctionNames = 'fatal' | 'error' | 'warn' | 'info' | 'debug' | 'trace' | 'silly';
export declare const LogLevel: {
    [key: string]: number;
};
export interface ILogger {
    error(message: string, data?: any): void;
    info(message: string, data?: any): void;
    warn(message: string, data?: any): void;
    debug(message: string, data?: any): void;
}
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