/**
 * Turn a string into a URL friendly variant by stripping any weird formatting.
 *
 * - Accents are stripped;
 * - Non-alphanumeric is replaced with a hyphen;
 * - The resulting string is lower case.
 *
 * @param input The input string to normalize.
 * @param stripTrailingHyphen Strip a trailing hyphen. Disable for example when processing user
 *   input directly while the user is typing.
 * @returns The normalized string.
 */
export declare function normalize(input: string, stripTrailingHyphen?: boolean): string;