title: Object doesn't support property or method 'assign'
body: <p>I setup webpack + babel config</p>
  
  <p><strong>webpack.config.js</strong></p>
  
  <pre><code>...
    module: {
      rules: [
        {
          test: /\.(js|jsx)$/,
          exclude: /node_modules/,
          loader: 'babel-loader'
        },
  ...
  </code></pre>
  
  <p><strong>.babelrc</strong> </p>
  
  <pre><code>{
    "plugins": ["lodash", "transform-object-rest-spread"],
    "presets": [
      ["env", {
        "targets": [
          "&gt; 4%",
          "ie 11",
          "safari 8"
        ]
      }],
      "react",
      "react-optimize"
    ],
    "env": {
      "test": {
        "presets": ["es2015", "react"]
      }
    }
  }
  </code></pre>
  
  <p>In google chrome everything is ok, but in IE 11i have an error</p>
  
  <blockquote>
    <p>Object doesn't support property or method 'assign'</p>
  </blockquote>