import type { KnowledgeChunkRow } from "./knowledge-store.js";
export declare const MIN_LEXICAL_RELEVANCE = 0.08;
export declare const MIN_VECTOR_SIMILARITY = 0.35;
export declare function estimateKnowledgeTokens(text: string): number;
export declare function normalizeKnowledgeTitle(value: string | null | undefined): string | undefined;
export declare function isPollutedKnowledgeHeading(value: string | null | undefined): boolean;
export declare function resolveKnowledgeTitle(input: {
    headingPath?: string | null;
    documentTitle?: string | null;
    content?: string | null;
    source?: string | null;
    url?: string | null;
}): string | undefined;
export declare function lexicalRelevance(query: string, chunk: Pick<KnowledgeChunkRow, "heading_path" | "content" | "source" | "document_title">): number;
export declare function vectorSimilarity(distance: number): number;
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