constructor() {
    /**
     * HTML attributes to add to all links created.  Default are `rel=nofollow`
     * and `target=_blank`. To clear these defaults attributes, set them
     * explicitly to '', i.e. `{rel: '', target: ''}`.
     * @const {!Object<string, ?goog.html.SafeHtml.AttributeValue>|undefined}
     */
    this.attributes;
    /**
     * Whether to preserve newlines with &lt;br&gt;.
     * @const {boolean|undefined}
     */
    this.preserveNewlines;
    /**
     * Whether to preserve spaces with non-breaking spaces and tabs with
     * &lt;span style="white-space:pre"&gt;
     * @const {boolean|undefined}
     */
    this.preserveSpacesAndTabs;
  }
Options bag for linkifyPlainTextAsHtml's second parameter.
@record