elasticsearch-js/tasks/generate/js_api/templates/enum.param.tmpl

if (_.contains(<%= _.camelCase(name) %>Options, <%= get %>)) {
  <%= set %> = <%= get %>;
} else {
  throw new TypeError(
    'Invalid <%= name %>: ' + <%= get %> +
    ' should be one of ' + <%= _.camelCase(name) %>Options.join(', ') + '.'
  );
}