declare const DateString: (fmt?: string) => string;
type LoggerType = 'Loaded' | 'Test' | 'Dev' | 'Error' | 'Warn' | String;
interface Options {
    isPrint?: boolean;
    execTime?: number;
    payload?: any;
}
declare class _Logger {
    private static instance;
    /**
     * The static method that controls the access to the singleton instance.
     *
     * This implementation let you subclass the Singleton class while keeping
     * just one instance of each subclass around.
     */
    static getInstance: () => _Logger;
    /**
     * The Singleton's constructor should always be private to prevent direct
     * construction calls with the `new` operator.
     */
    private _logPath;
    private constructor();
    private init;
    private _baseHandler;
    private _processId;
    log(type: LoggerType, message: string, options?: Options): void | {
        _str: string;
        options: Options;
    };
    error(type: LoggerType, message: string, options?: Options): void | {
        _str: string;
        options: Options;
    };
    warn(type: LoggerType, message: string, options?: Options): void | {
        _str: string;
        options: Options;
    };
}
declare const Logger: _Logger;
export { Logger, DateString };