/**
 * Formats a string by applying a *formatter* function to its words and joins them with a `separator` string. A **word** is considered as a sequence of alphanumerical characters (including diacritics).
 *
 * @param { string } str
 * @param { (word: string, idx: number) => string } formatter - Formatter function to apply to every `str` words.
 * @param { string } [separator = ''] - String to join formatted words with. Defaults to `" "`.
 * @returns { string } Formatted string.
 */
export function formatWords(str: string, formatter: (word: string, idx: number) => string, separator?: string): string;
/**
 * Converts a string to kebab case. Only alphanumeric characters are considered. Diacritics are removed.
 *
 * @param { string } str
 * @returns { string } Kebab cased string.
 *
 * @example
 * ```js
 * kebabCase('El Cartógrafo Silencioso') // 'el-cartografo-silencioso'
 * ```
 */
export function kebabCase(str: string): string;
/**
 * Splits a string into an array of its words. A **word** is considered as a sequence of alphanumerical characters (including diacritics).
 *
 * @param { string } str
 * @returns { string[] } Array of words.
 *
 * @example
 * ```js
 * words("A Day At The Beach") // ["A", "Day", "At", "The", "Beach"]
 * ```
 */
export function words(str: string): string[];
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