/**
 * ROI Dashboard computation helpers — extracted from ROIDashboardService.ts
 * to keep the main service file under the 500-line governance limit.
 */
import type { AnalyticsRepository } from './AnalyticsRepository.js';
import type { ROIDashboard, ROIMetrics, UsageEvent } from './types.js';
export declare function calculateTimeSaved(events: UsageEvent[], timeSavedPerSuccess: number): number;
export declare function groupBySkill(events: UsageEvent[]): Record<string, UsageEvent[]>;
export declare function calculateWeeklyTrend(events: UsageEvent[], startDate: string, endDate: string, timeSavedPerSuccess: number): Array<{
    week: string;
    timeSaved: number;
}>;
export declare function computeStakeholderROIOnTheFly(repo: AnalyticsRepository, startDate: string, endDate: string, assertRange: (s: string, e: string) => void): ROIDashboard['stakeholder'];
export declare function computeUserMetrics(repo: AnalyticsRepository, userId: string, startDate: string, endDate: string, timeSavedPerSuccess: number, valuePerMinute: number): Omit<ROIMetrics, 'id' | 'createdAt'>;
export declare function computeSkillMetrics(repo: AnalyticsRepository, skillId: string, startDate: string, endDate: string, timeSavedPerSuccess: number, valuePerMinute: number): Omit<ROIMetrics, 'id' | 'createdAt'>;
export declare function computeDailyMetrics(startDate: string, endDate: string): Omit<ROIMetrics, 'id' | 'createdAt'>;
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