/**
 * Simple progress tracker for discovery operations
 */
export declare class ProgressTracker {
    private readonly totalCombinations;
    private startTime;
    private lastUpdateTime;
    private readonly updateIntervalMs;
    constructor(totalCombinations: number);
    /**
     * Update progress and return formatted status string
     * Only returns a new string if enough time has passed since last update
     *
     * @param current - Current combination index
     * @param devicesFound - Number of devices found so far
     * @returns Progress string or null if no update needed
     */
    update(current: number, devicesFound: number): string | null;
    /**
     * Format duration in seconds to human-readable string
     */
    private formatDuration;
}
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