whole_func_string: function loadDirectlyScript() {
  	return new Promise( ( resolve, reject ) => {
  		loadScript( DIRECTLY_RTM_SCRIPT_URL, function( error ) {
  			if ( error ) {
  				return reject( new Error( `Failed to load script "${ error.src }".` ) );
  			}
  			resolve();
  		} );
  	} );
  }
func_code_string: function loadDirectlyScript() {
  	return new Promise( ( resolve, reject ) => {
  		loadScript( DIRECTLY_RTM_SCRIPT_URL, function( error ) {
  			if ( error ) {
  				return reject( new Error( `Failed to load script "${ error.src }".` ) );
  			}
  			resolve();
  		} );
  	} );
  }
func_documentation_string: Make the request for Directly's remote JavaScript.
  
  @returns {Promise} Promise that resolves after the script loads or fails