amcharts3-react: Uncaught ReferenceError: AmCharts is not defined, in webpack2 import

I just failed to import AmCharts with guidelines from the tutorial.

Below are my files:

chart.js

import React, {Component, PropTypes} from 'react';
import AmCharts from "@amcharts/amchart3-react";

....
return (<AmCharts.React
                    {...config} />)

package.json

  "devDependencies": {
    "@amcharts/amcharts3-react": "^2.0.0",
    "react": "15.4.2",
    "react-dom": "15.4.2",
    "webpack": "^2.3.2",
    "webpack-dev-middleware": "1.6.1",
    "webpack-hot-middleware": "2.12.2",
    "webpack-md5-hash": "0.0.5"
  },

webpack.config.js

import webpack from 'webpack';
import HtmlWebpackPlugin from 'html-webpack-plugin';
import autoprefixer from 'autoprefixer';
import path from 'path';

export default {
  devtool: 'cheap-module-eval-source-map',
  entry: [
    './src/webpack-public-path',
    'webpack-hot-middleware/client?reload=true',
    './src/index'
  ],
  devServer: {
    historyApiFallback: true,
    noInfo: true,
  },
  target: 'web',
  output: {
    path: `${__dirname}/src`,
    publicPath: '/',
    filename: 'bundle.js'
  },
  plugins: [
    new webpack.DefinePlugin({
      'process.env.NODE_ENV': JSON.stringify('development'),
      __DEV__: true
    }),
    new webpack.HotModuleReplacementPlugin(),
    new webpack.NoEmitOnErrorsPlugin(),
    new HtmlWebpackPlugin({
      template: 'src/index.ejs',
      minify: {
        removeComments: true,
        collapseWhitespace: true
      },
      inject: true
    }),
    new webpack.LoaderOptionsPlugin({
      options: {
        context: '/',
        postcss: [
          autoprefixer({
            cascade: false,
            browsers: ['Chrome >= 49', 'Firefox >= 49', 'Edge >= 13']
          })
        ],
      }
    })
  ],
  module: {
    rules: [
      {
        test: /\.js$/, exclude: /node_modules/, use: [{
        loader: 'babel-loader',
        // options: { presets: ['es2015'] },
      }],
      },
      {
        test: /\.eot(\?v=\d+.\d+.\d+)?$/, use: [{
        loader: 'file-loader',
      }]
      },
      {
        test: /\.woff(2)?(\?v=[0-9]\.[0-9]\.[0-9])?$/,
        use: [{
          loader: 'url-loader',
          options: {
            limit: 10000,
            mimetype: 'image/font-woff',
          }
        }]
      },
      {
        test: /\.ttf(\?v=\d+\.\d+\.\d+)?$/,
        use: [{
          loader: 'url-loader',
          options: {
            limit: 10000,
            mimetype: 'image/octet-stream',
          }
        }]
      },
      {
        test: /\.svg(\?v=\d+\.\d+\.\d+)?$/,
        use: [{
          loader: 'url-loader',
          options: {
            limit: 10000,
            mimetype: 'image/svg+xml',
          }
        }]
      },
      {
        test: /\.(jpe?g|png|gif)$/i,
        use: [{
          loader: 'file-loader',
          options: {
            name: '[name].[ext]'
          }
        }]
      },
      {
        test: /\.ico$/,
        use: [{
          loader: 'file-loader',
          options: {
            name: '[name].[ext]'
          }
        }]
      },
      {
        test: /(\.css|\.scss)$/,
        use: [{
          loader: 'style-loader'
        }, {
          loader: 'css-loader',
          options: {
            sourceMap: true
          }
        }, {
          loader: 'postcss-loader',
        }, {
          loader: 'sass-loader',
          options: {
            includePaths: [
              path.resolve(__dirname, "some-folder")
            ],
            sourceMap: true
          }
        }]
      }
    ]
  }
};