/**
 * Format elapsed time in human-readable format
 */
export declare function formatElapsed(ms: number): string;
/**
 * ProgressRenderer - Single-line progress display with progress bar
 *
 * Features:
 * - Animated spinner
 * - Readable text (subtle pulse)
 * - Progress bar with iteration tracking
 * - Elapsed time counter
 * - Live cost display
 * - Dynamic step updates
 * - Sub-step indicator
 */
export declare class ProgressRenderer {
    private frame;
    private startTime;
    private currentStep;
    private subStep;
    private interval;
    private lastRender;
    private lastStepUpdate;
    private minStepInterval;
    private currentIteration;
    private maxIterations;
    private currentCost;
    /**
     * Start the progress renderer
     * @param initialStep Initial step text to display
     */
    start(initialStep: string): void;
    /**
     * Update iteration progress for the progress bar
     */
    updateProgress(iteration: number, maxIterations: number, cost?: number): void;
    /**
     * Update the main step text (debounced to prevent rapid switching)
     */
    updateStep(step: string): void;
    /**
     * Update the sub-step text (shown below main step)
     */
    updateSubStep(subStep: string): void;
    /**
     * Render the progress line(s)
     */
    private render;
    /**
     * Stop the renderer and show completion message
     */
    stop(finalMessage?: string, success?: boolean): void;
    /**
     * Stop with error
     */
    fail(errorMessage?: string): void;
}
/**
 * Create a simple progress renderer for one-off operations
 */
export declare function createProgress(initialStep: string): ProgressRenderer;
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