/**
 * Simplifies a string by removing spaces, punctuation, and diacritics,
 * replacing `&` with `and`, and lowercasing the result.
 * Useful for generating normalized keys that can be compared across languages and scripts.
 *
 * For punctuation ranges see https://stackoverflow.com/a/21224179
 *
 * @param   str - The input string to simplify
 * @returns A normalized, lowercase string with all whitespace, punctuation, and diacritics removed.
 *          Returns an empty string if the input is not a string.
 */
export declare function simplify(str?: string): string;
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