import type { StallDetectionOptions } from './options.js';
export declare class StallDetector {
    private options;
    private onStallDetected;
    private intervalId;
    private lastProgressTime;
    private lastProgressValue;
    private isActive;
    constructor(options: StallDetectionOptions, onStallDetected: (reason: string) => void);
    /**
     * Start monitoring for stalls
     * @param initialProgress Optional initial progress value to start with
     */
    start(initialProgress?: number): void;
    /**
     * Stop monitoring for stalls
     */
    stop(): void;
    /**
     * Update progress information
     * @param progressValue The current progress value (bytes uploaded)
     */
    updateProgress(progressValue: number): void;
    /**
     * Check if upload has stalled based on progress events
     */
    private _isProgressStalled;
    /**
     * Handle a detected stall
     */
    private _handleStall;
}