/**
 * Time Tracker - Parse estimates and calculate actual time
 * @requirement FREE-TIER-004 - Time Tracking
 */
export interface TimeEntry {
    startTime: string;
    endTime?: string;
    duration?: number;
}
export interface TimeTracking {
    estimatedTime?: string;
    estimatedHours?: number;
    actualTime?: number;
    startedAt?: string;
    completedAt?: string;
    timeEntries: TimeEntry[];
}
export declare class TimeTracker {
    /**
     * Parse estimate string to hours
     * Supports: "2 days", "4 hours", "1 week", "30m", etc.
     */
    static parseEstimate(estimate: string): number;
    /**
     * Calculate actual time from start to end
     */
    static calculateActualTime(startTime: string, endTime: string): number;
    /**
     * Format time for display
     * Examples: "30m", "2.5h", "3d", "2d 4h"
     */
    static formatTime(hours: number): string;
    /**
     * Compare estimated vs actual time
     * Returns: { ratio, status, message }
     */
    static compareTime(estimatedHours: number, actualHours: number): {
        ratio: number;
        status: 'under' | 'on-track' | 'over';
        message: string;
    };
}