How to add element to an existing DOMtastic instance ? about domtastic HOT 2 CLOSED

export const add = function( elements ) {
  const nodes = this.nodeType ? [ this ] : this;
  if ( typeof elements === 'string' ) {
    elements = querySelector( elements );
  } else {
    elements = Array.isArray( elements ) ? elements : [ elements ];
  }
  each( elements, element => {
    if ( nodes.indexOf( element ) === -1 ) {
      nodes.push( element );
    }
  } );
  return hexadogJS( nodes );
};