phpstan: conditional returns

Author: justlevine

src/wp-includes/user.php

@@ -893,7 +893,9 @@ function get_users( $args = array() ) {
  *     @type string $exclude       An array, comma-, or space-separated list of user IDs to exclude. Default empty.
  *     @type string $include       An array, comma-, or space-separated list of user IDs to include. Default empty.
  * }
- * @return string|null The output if echo is false. Otherwise null.
+ * @return string|void The output if echo is false. Otherwise void.
+ *
+ * @phpstan-return ( $args is array{echo:false}&array ? string : void )
  */
 function wp_list_users( $args = array() ) {
 	$defaults = array(