code: function sanitizeResourceUrl(unsafeResourceUrl) {
      var s = getCurrentSanitizer();
      if (s) {
          return s.sanitize(SecurityContext.RESOURCE_URL, unsafeResourceUrl) || '';
      }
      if (allowSanitizationBypass(unsafeResourceUrl, "ResourceUrl" /* ResourceUrl */)) {
          return unsafeResourceUrl.toString();
      }
      throw new Error('unsafe value used in a resource URL context (see http://g.co/ng/security#xss)');
  }
docs: A `url` sanitizer which only lets trusted `url`s through.
  
  This passes only `url`s marked trusted by calling {@link bypassSanitizationTrustResourceUrl}.
  
  @param unsafeResourceUrl untrusted `url`, typically from the user.
  @returns `url` string which is safe to bind to the `src` properties such as `<img src>`, because
  only trusted `url`s have been allowed to pass.