/**
 * Prepends "http://" to a url, if it looks like something that is meant to be a TLD.
 *
 * @param {string} url The URL to test.
 *
 * @example
 * ```js
 * const actualURL = prependHTTP( 'wordpress.org' ); // http://wordpress.org
 * ```
 *
 * @return {string} The updated URL.
 */
export function prependHTTP(url: string): string;
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