export interface ReadabilityScore extends Record<string, unknown> {
    words?: number;
    sentences?: number;
    difficultWords?: string[];
    score?: number;
    formula?: string;
}
export interface ReadabilityScoreOptions {
    stats?: boolean;
    difficultWords?: boolean;
    formula?: 'ARI' | 'DaleChall' | 'ColemanLiau' | 'FleschKincaid' | 'GunningFog' | 'SMOG' | 'Spache';
}
export declare function getReadabilityScore(input: string, customOptions?: ReadabilityScoreOptions): ReadabilityScore;
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