/**
 * Churn Extractor — Spec 13 R1.
 *
 * Extracts git churn data (file-level and function-level) from a repository
 * and writes it into the code index database. All git access is read-only and
 * degrades gracefully when no repository exists.
 *
 * File churn: `git log --numstat` aggregates commit counts, line adds/deletes,
 * and author stats per file.
 *
 * Function churn: `git log -p` hunks are mapped to function line spans stored
 * in the `functions` table. A function is attributed churn when a hunk overlaps
 * its line range.
 */
import type { ChurnConfig } from '../types.js';
export interface ChurnResult {
    fileCount: number;
    functionCount: number;
    durationMs: number;
}
export declare const DEFAULT_CHURN_CONFIG: ChurnConfig;
/**
 * Extract git churn data and write it into the database.
 * Degrades gracefully when no git repo exists — writes empty tables.
 *
 * @param rawDb  The underlying better-sqlite3 database handle.
 * @param targetPath  Absolute path to the repository root.
 * @param config  Optional churn config (window, etc.).
 * @returns  Counts and timing for evidence bundles.
 */
export declare function extractChurn(rawDb: any, targetPath: string, config?: ChurnConfig): ChurnResult;
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