All files / src/utils getMemberExpressionRoot.js

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/*
 * Copyright (c) 2015, Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 * @flow
 */
 
import recast from 'recast';
var {types: {namedTypes: types}} = recast;
 
/**
 * Returns the path to the first part of the MemberExpression. I.e. given a
 * path representing
 *
 * foo.bar.baz
 *
 * it returns the path of/to `foo`.
 */
export default function getMemberExpressionRoot(
  memberExpressionPath: NodePath
): NodePath {
  do {
    memberExpressionPath = memberExpressionPath.get('object');
  } while(types.MemberExpression.check(memberExpressionPath.node));
  return memberExpressionPath;
}