export declare function titleCase(input: string, options?: TitleCaseOptions | string[] | string): string;
export declare const WORD_SEPARATORS: Set<string>;
export declare const SENTENCE_TERMINATORS: Set<string>;
export declare const TITLE_TERMINATORS: Set<string>;
export declare const SMALL_WORDS: Set<string>;
export declare interface TitleCaseOptions {
  locale?: string | string[]
  sentenceCase?: boolean
  sentenceTerminators?: Set<string>
  smallWords?: Set<string>
  titleTerminators?: Set<string>
  wordSeparators?: Set<string>
}