/**
 * Analytics storage — lightweight JSON-based local store.
 * Tracks per-repo PR sizes over time for trend analysis.
 */
export interface PRRecord {
    timestamp: string;
    repo: string;
    prNumber: number;
    lines: number;
    reviewableLines: number;
    reviewMinutes: number;
    stackId: string;
    stackPosition: number;
}
/**
 * Record a PR submission for trend tracking.
 */
export declare function recordPR(record: PRRecord): Promise<void>;
/**
 * Load PR history for a repo (or all repos).
 */
export declare function loadPRHistory(repo?: string): Promise<PRRecord[]>;
/**
 * Compute trend stats from PR history.
 */
export declare function computeTrends(records: PRRecord[]): {
    avgSize: number;
    medianSize: number;
    totalPRs: number;
    avgReviewTime: number;
    sizeOverTime: {
        week: string;
        avgSize: number;
    }[];
};
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