/**
 * PlanDiff (v3.1)
 *
 * Structural comparison of two EXPLAIN plans:
 *  - added: op nodes present in B but not A
 *  - removed: op nodes present in A but not B
 *  - changed: same op path but cost/rows/index differs
 *  - costDelta: signed sum of cost changes (positive = slower, negative = faster)
 *
 * Plans are compared by their op-table signature (op + table + depth path),
 * treating index swaps and cost moves as "changed" rather than removed/added.
 */
import type { NormalizedPlan, NormalizedPlanNode } from './explain-parser.js';
export interface PlanDiffResult {
    identical: boolean;
    added: NormalizedPlanNode[];
    removed: NormalizedPlanNode[];
    changed: {
        key: string;
        from: NormalizedPlanNode;
        to: NormalizedPlanNode;
        costDelta: number;
        rowsDelta: number;
    }[];
    costDelta: number;
    rowsDelta: number;
}
export declare class PlanDiff {
    /** Compare two normalized plans. Order doesn't matter; structure does. */
    static compare(planA: NormalizedPlan, planB: NormalizedPlan): PlanDiffResult;
}
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