react/src/isomorphic/devtools/ReactInvalidSetStateWarningDevTool.js

/**
 * Copyright 2016-present, 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 ReactInvalidSetStateWarningDevTool
 */

'use strict';

var warning = require('warning');

if (__DEV__) {
  var processingChildContext = false;

  var warnInvalidSetState = function() {
    warning(
      !processingChildContext,
      'setState(...): Cannot call setState() inside getChildContext()'
    );
  };
}

var ReactInvalidSetStateWarningDevTool = {
  onBeginProcessingChildContext() {
    processingChildContext = true;
  },
  onEndProcessingChildContext() {
    processingChildContext = false;
  },
  onSetState() {
    warnInvalidSetState();
  },
};

module.exports = ReactInvalidSetStateWarningDevTool;