/** Log levels. */
export declare enum LogLevel {
    DEBUG = "debug",
    LOG = "log",
    INFO = "info",
    WARN = "warn",
    ERROR = "error",
    OFF = "off"
}
/** Interface definition for the logger. */
export declare type ILogger = Pick<typeof console, 'debug' | 'log' | 'info' | 'warn' | 'error'>;
/** The logger class. */
export declare class Logger implements ILogger {
    private readonly logger;
    private level;
    /**
     * Constructs a new logger.
     *
     * @param logger The wrapped logger that will be used for printing messages. Default: `console`.
     * @param level The log level. Default: `'info'`.
     */
    constructor(logger?: ILogger, level?: LogLevel);
    /**
     * Checks if the given value is a supported log level.
     *
     * @param value The value to check.
     * @returns `true` if the given value is a supported log level, otherwise `false`.
     */
    static isSupportedLogLevel(value: any): value is LogLevel;
    /**
     * Set the log level to the given level.
     *
     * @param level The new log level.
     */
    setLogLevel(level: LogLevel): void;
    /**
     * Whether debugging is enabled or not.
     *
     * @returns `true` if debug level is enabled, otherwise `false`.
     */
    isDebugEnabled(): boolean;
    /**
     * Prints the given message as a debug log entry.
     *
     * @param message The message to print.
     * @param optionalParams Optional arguments.
     */
    debug(message?: unknown, ...optionalParams: any[]): void;
    /**
     * Prints the given message as a log entry.
     *
     * @param message The message to print.
     * @param optionalParams Optional arguments.
     */
    log(message?: unknown, ...optionalParams: any[]): void;
    /**
     * Prints the given message as a info log entry.
     *
     * @param message The message to print.
     * @param optionalParams Optional arguments.
     */
    info(message?: unknown, ...optionalParams: any[]): void;
    /**
     * Prints the given message as a warn log entry.
     *
     * @param message The message to print.
     * @param optionalParams Optional arguments.
     */
    warn(message?: unknown, ...optionalParams: any[]): void;
    /**
     * Prints the given message as a error log entry.
     *
     * @param message The message to print.
     * @param optionalParams Optional arguments.
     */
    error(message?: unknown, ...optionalParams: any[]): void;
    private message;
}
/**
 * Constructs a new logger.
 *
 * @param logger The wrapped logger that will be used for printing messages. Default: console.
 * @returns A newly constructed logger.
 */
export declare function createLogger(logger?: ILogger): Logger;
/**
 * Logger for pug-fmt.
 */
export declare const logger: Logger;