/**
 * Copyright 2013-2015, 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.
 *
 * @providesModule getTextContentAccessor
 */

'use strict';

var ExecutionEnvironment = require('ExecutionEnvironment');

var contentKey = null;

/**
 * Gets the key used to access text content on a DOM node.
 *
 * @return {?string} Key used to access text content.
 * @internal
 */
function getTextContentAccessor() {
  if (!contentKey && ExecutionEnvironment.canUseDOM) {
    // Prefer textContent to innerText because many browsers support both but
    // SVG <text> elements don't support innerText even when <div> does.
    contentKey = 'textContent' in document.documentElement ?
      'textContent' :
      'innerText';
  }
  return contentKey;
}

module.exports = getTextContentAccessor;
