/**
 * Graph diff — structural delta between two SutraGraph scans.
 * Candidate structural comparison only; does not explain why code changed.
 */
import type { SutraGraph, SutraNode, SutraEdge, SutraIssue } from "./types.js";
export declare const DIFF_VERSION = 0;
export interface SutraIssueChange {
    before: SutraIssue;
    after: SutraIssue;
}
export interface SutraDiff {
    diff_version: number;
    nodes_added: SutraNode[];
    nodes_removed: SutraNode[];
    edges_added: SutraEdge[];
    edges_removed: SutraEdge[];
    issues_added: SutraIssue[];
    issues_removed: SutraIssue[];
    issues_changed: SutraIssueChange[];
}
export declare function loadGraphFile(filePath: string): SutraGraph;
export declare function diffGraphs(a: SutraGraph, b: SutraGraph): SutraDiff;
/** Human-readable counts-only summary line. */
export declare function formatDiffSummary(diff: SutraDiff): string;