/**
 * FlowDrop Logger
 *
 * Lightweight configurable logger for the FlowDrop library.
 * Disabled by default — consumers enable it for debugging.
 *
 * @module utils/logger
 *
 * @example
 * ```typescript
 * import { setLogLevel } from '@flowdrop/flowdrop/core';
 *
 * // Enable debug logging during development
 * setLogLevel('debug');
 *
 * // Enable only warnings and errors
 * setLogLevel('warn');
 *
 * // Disable all logging (default)
 * setLogLevel('none');
 * ```
 */
/** Log severity levels. `'none'` disables all output. */
export type LogLevel = 'debug' | 'info' | 'warn' | 'error' | 'none';
/**
 * Set the minimum log level for FlowDrop library output.
 * Messages below this level are silently discarded.
 *
 * @param level - The minimum severity to display. Use `'none'` to disable all output.
 */
export declare function setLogLevel(level: LogLevel): void;
/**
 * Get the current log level.
 */
export declare function getLogLevel(): LogLevel;
/**
 * FlowDrop library logger.
 *
 * All methods are no-ops when the log level is set to `'none'` (default).
 * Enable output by calling `setLogLevel()`.
 */
export declare const logger: {
    debug(message: string, ...args: unknown[]): void;
    info(message: string, ...args: unknown[]): void;
    warn(message: string, ...args: unknown[]): void;
    error(message: string, ...args: unknown[]): void;
};