import type { Entity } from './types.js';
export interface SimilarityScore {
    exact: number;
    lexical: number;
    semantic: number;
    structural: number;
    combined: number;
}
export interface EmbeddingStore {
    get(canonicalId: string): number[] | null;
    embed?(text: string): number[];
    findSimilar?(vector: number[], limit: number): {
        canonicalId: string;
        score: number;
    }[];
}
export declare const WEIGHTS: {
    readonly exact: 0.4;
    readonly lexical: 0.2;
    readonly semantic: 0.3;
    readonly structural: 0.1;
};
export declare const THRESHOLDS: {
    readonly duplicate: 0.95;
    readonly duplicateLexical: 0.98;
    readonly duplicateSemantic: 0.98;
    readonly duplicateStructural: 0.95;
    readonly similar: 0.8;
    readonly related: 0.6;
};
export declare function tokenize(text: string): Set<string>;
export declare function jaccardSimilarity(a: Set<string>, b: Set<string>): number;
export declare function cosineSimilarity(a: number[] | null | undefined, b: number[] | null | undefined): number;
export declare function computeStructuralSimilarityFromNeighbors(a: Set<string>, b: Set<string>): number;
export declare function computeSimilarity(a: Entity, b: Entity, embeddings: EmbeddingStore, options?: {
    structural?: number;
}): SimilarityScore;
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