/**
 * Convert a string to a URL-friendly slug
 * @param str - The string to convert
 * @returns The slugified string
 * @example
 * slugify("Hello World!"); // "hello-world"
 * slugify("This is a Test"); // "this-is-a-test"
 * slugify("Japanese: こんにちは"); // "japanese"
 */
export declare const slugify: (string_: string) => string;