export interface TfIdfCorpus {
    docSets: Set<string>[];
    docCount: number;
}
export declare function buildCorpus(allTexts: string[]): TfIdfCorpus;
export declare function extractKeywords(text: string, allTexts: string[], topN: number): string[];
export declare function extractKeywords(text: string, corpus: TfIdfCorpus, topN: number): string[];
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