declare const LEVELS_MAP: {
    emerg: number;
    alert: number;
    crit: number;
    error: number;
    warn: number;
    notice: number;
    info: number;
    debug: number;
};
/** Available log levels. */
export type LEVEL = keyof typeof LEVELS_MAP;
/** Options that can be passed to the Logger constructor. */
export interface LoggerOptions {
    /**
     * Sets the maximum log level that will be output. By setting this option to 'info', it can be used to disable debug logs in production.
     * @default 'debug'
     */
    level?: LEVEL;
    /**
     * Enables the human friendly development output.
     * @default process.env.NODE_ENV === 'development'
     */
    devMode?: boolean;
}
/** Creates a new logger instance. */
export declare class Logger {
    level: LEVEL;
    devMode: boolean;
    constructor(options?: LoggerOptions);
    /**
     * Logs a message at the given log level.
     * @param level Log level for the message.
     * @param message The message to log.
     * @param data Any additional data to log with the message. This can be any type.
     */
    log: (level: LEVEL, message: string, data?: unknown) => void;
    /**
     * Logs a message at the EMERG log level.
     * @param message The message to log.
     * @param data Any additional data to log with the message. This can be any type.
     */
    emerg: (message: string, data?: unknown) => void;
    /**
     * Logs a message at the ALERT log level.
     * @param message The message to log.
     * @param data Any additional data to log with the message. This can be any type.
     */
    alert: (message: string, data?: unknown) => void;
    /**
     * Logs a message at the CRIT log level.
     * @param message The message to log.
     * @param data Any additional data to log with the message. This can be any type.
     */
    crit: (message: string, data?: unknown) => void;
    /**
     * Logs a message at the ERROR log level.
     * @param message The message to log.
     * @param data Any additional data to log with the message. This can be any type.
     */
    error: (message: string, data?: unknown) => void;
    /**
     * Logs a message at the WARN log level.
     * @param message The message to log.
     * @param data Any additional data to log with the message. This can be any type.
     */
    warn: (message: string, data?: unknown) => void;
    /**
     * Logs a message at the NOTICE log level.
     * @param message The message to log.
     * @param data Any additional data to log with the message. This can be any type.
     */
    notice: (message: string, data?: unknown) => void;
    /**
     * Logs a message at the INFO log level.
     * @param message The message to log.
     * @param data Any additional data to log with the message. This can be any type.
     */
    info: (message: string, data?: unknown) => void;
    /**
     * Logs a message at the DEBUG log level.
     * @param message The message to log.
     * @param data Any additional data to log with the message. This can be any type.
     */
    debug: (message: string, data?: unknown) => void;
}
export {};