import type { ReductionResult } from "../reducer/reducer.ts";
export interface TreeDiff {
    added: string[];
    removed: string[];
    modified: string[];
}
export declare function diffTrees(a: ReductionResult, b: ReductionResult): TreeDiff;
/**
 * Unified diff of two texts (Phase 16 M1.2, docs/18 §1.2).
 *
 * Built on merge3's LCS hunk core rather than a second diff implementation: a patch an
 * agent reads must describe the same line changes the reducer would merge, and two
 * independent algorithms would eventually disagree about which lines moved.
 *
 * `context` lines surround each hunk; adjacent hunks whose context would overlap are
 * emitted as one, the way `diff -u` does.
 */
export declare function unifiedDiff(a: string, b: string, opts?: {
    context?: number;
}): string;
export interface OpSetDiff {
    /** Accepted in b but not a. */
    added: string[];
    /** Accepted in a but not b. */
    removed: string[];
}
/** Symmetric difference of the accepted operation sets of two reductions. */
export declare function diffAcceptedOps(a: ReductionResult, b: ReductionResult): OpSetDiff;
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