export type TrendMetric = "hotspots" | "churn" | "contributors" | "commit_count";
export type PeriodLength = "week" | "month" | "quarter";
export interface PeriodData {
    label: string;
    since: string;
    until: string;
    value: number;
}
export interface TrendResult {
    metric: TrendMetric;
    periodLength: PeriodLength;
    periods: PeriodData[];
    delta: number;
    deltaPercentage: number | null;
    direction: "improving" | "stable" | "worsening";
}
export interface TrendAnalysisOptions {
    metric: TrendMetric;
    periodLength?: PeriodLength;
    numPeriods?: number;
    pathPattern?: string;
    timeoutMs?: number;
}
/**
 * Analyze trend over time by running the same analysis across multiple time periods.
 * Compares period-over-period changes to detect improvement or deterioration.
 */
export declare function analyzeTrend(repoPath: string, options: TrendAnalysisOptions): Promise<TrendResult>;
interface PeriodBoundary {
    label: string;
    since: string;
    until: string;
}
export declare function computePeriodBoundaries(periodLength: PeriodLength, numPeriods: number): PeriodBoundary[];
export declare function formatPeriodLabel(date: Date, periodLength: PeriodLength): string;
/**
 * Classify trend direction based on metric semantics.
 * For hotspots and churn: increase = worsening (more files changing, more churn)
 * For contributors: increase = improving (more people contributing)
 * For commit_count: neutral (just activity, context-dependent)
 */
export declare function classifyDirection(metric: TrendMetric, delta: number, baseValue: number): "improving" | "stable" | "worsening";
export {};