@wordpress/url/build-module/prepend-http.js

WordPress URL utilities.

/**
 * Internal dependencies
 */
import { isEmail } from './is-email';
var USABLE_HREF_REGEXP = /^(?:[a-z]+:|#|\?|\.|\/)/i;
/**
 * 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) {
  if (!url) {
    return url;
  }

  url = url.trim();

  if (!USABLE_HREF_REGEXP.test(url) && !isEmail(url)) {
    return 'http://' + url;
  }

  return url;
}
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