index.js

/**
 * Copyright (c) 2014-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

import { getVisitor } from "./visit";

export default function (context) {
  const plugin = {
    visitor: getVisitor(context),
  };

  // Some presets manually call child presets, but fail to pass along the
  // context object. Out of an abundance of caution, we verify that it
  // exists first to avoid causing unnecessary breaking changes.
  const version = context && context.version;

  // The "name" property is not allowed in older versions of Babel (6.x)
  // and will cause the plugin validator to throw an exception.
  if (version && parseInt(version, 10) >= 7) {
    plugin.name = "regenerator-transform";
  }

  return plugin;
}