import type { KnowledgeEntry, KnowledgeSource, KnowledgeType } from '../types/index.js';
export interface ExtractedKnowledgeCandidate {
    type?: string;
    title?: string;
    content?: string;
    summary?: string;
    confidence?: number;
    tags?: string[];
}
export declare function isKnowledgeType(value: string | undefined): value is KnowledgeType;
export declare function clampConfidence(value: number | undefined, fallback?: number): number;
export declare function generateTitle(content: string): string;
export declare function shortenKnowledgeTitle(title: string | undefined, fallbackContent?: string): string;
export declare function generateSummary(content: string): string;
export declare function uniqueTags(tags: string[] | undefined): string[];
export declare function normalizeForDedupe(content: string): string;
export declare function dedupeKey(type: KnowledgeType, content: string): string;
export declare function extractJsonBlock(raw: string): unknown;
export declare function normalizeKnowledgeCandidates(raw: unknown): ExtractedKnowledgeCandidate[];
export declare function isDuplicateEntry(candidate: Pick<KnowledgeEntry, 'type' | 'content'>, existing: KnowledgeEntry[]): boolean;
export declare function buildDerivedSource(baseSource: KnowledgeSource, context: string): KnowledgeSource;
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