export declare const DEFAULT_KEYPHRASE_TOP_K = 10;
export declare function tokenize(text: string): string[];
export declare function isContentWord(t: string): boolean;
export declare function extractKeyphraseTokens(title: string, body: string, topK?: number): string[];
export declare function keyphraseMatch(queryTokens: readonly string[], kpSet: ReadonlySet<string>): number;
export declare function queryKeyphraseTokens(query: string): string[];
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