export declare const STOPWORD_WEIGHT: "bi";
export declare const DEFAULT_EXCLUDE: Set<string>;
/**
 * Applies YAKE-style prefiltering before sentence/token processing.
 */
export declare function preFilter(text: string): string;
/**
 * Splits text into tokenized sentences.
 */
export declare function tokenizeSentences(text: string): string[][];
/**
 * Splits text into YAKE-style tokens.
 */
export declare function tokenizeWords(text: string): string[];
/**
 * Splits text into sentence strings.
 */
export declare function splitSentences(text: string): string[];
/**
 * Returns the YAKE tag used for candidate generation and scoring.
 */
export declare function getTag(word: string, index: number, exclude: ReadonlySet<string>): string;
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