export interface BrainEntity {
    id: string;
    category?: string;
    content: string;
    importance?: number;
    /** Optional precomputed embedding. If absent, we compute lazily. */
    vector?: number[];
    metadata?: Record<string, unknown>;
}
export interface BrainSnapshot {
    /** Optional friendly label ("brain-A", "January 2026", etc.) */
    label?: string;
    entities: BrainEntity[];
    source?: string;
}
export interface ConflictPair {
    a: BrainEntity;
    b: BrainEntity;
    reason: 'same-id-different-content' | 'high-similarity-different-position';
    similarity: number;
}
export interface BrainDiffReport {
    labelA: string;
    labelB: string;
    onlyInA: BrainEntity[];
    onlyInB: BrainEntity[];
    bothShared: BrainEntity[];
    conflicting: ConflictPair[];
    stats: {
        addedCount: number;
        removedCount: number;
        conflictCount: number;
        similarityScore: number;
        sizeA: number;
        sizeB: number;
    };
    narrative: string;
    svg: string;
}
export interface ApplyDiffOptions {
    strategy: 'mergeAll' | 'addOnly' | 'interactive';
    /** Called for each entity when strategy is 'interactive'. Return true to keep. */
    decide?: (entity: BrainEntity, from: 'A' | 'B') => boolean | Promise<boolean>;
}
export declare class BrainDiff {
    /** Compute a semantic diff between two brains. */
    diff(brainA: BrainSnapshot | string, brainB: BrainSnapshot | string): Promise<BrainDiffReport>;
    /**
     * Apply a diff back into a target brain snapshot. Returns the merged entities.
     * Caller is responsible for persisting them.
     */
    applyDiff(targetBrain: BrainSnapshot, diff: BrainDiffReport, opts: ApplyDiffOptions): Promise<BrainEntity[]>;
    private normalize;
    /** Cosine similarity between two entities. Embeds lazily if needed. */
    private cosine;
    private narrate;
    private renderSvg;
}
export declare function getBrainDiff(): BrainDiff;
export declare function resetBrainDiffForTests(): void;
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