title: Unknown plugin "transform-decorators-legacy" error when using react storybook in windows
body: <p>I cloned a React project created on Linux to my Windows machine.
  The Project includes few react components and a storybook to test those components.
  The "npm start" is configured to run the storybook at the "package.json" file:</p>
  
  <p>"start": "npm run storybook"</p>
  
  <p>After typing "npm start" I got this error on the browser console:</p>
  
  <p>"Uncaught Error: Module build failed: ReferenceError: Unknown plugin "transform-decorators-legacy" specified in 'C:\...\node_modules\@storybo ok\ui\node_modules\react-treebeard\.babelrc'".
  This is my webpack.config.js file (the problem probably comes from there):</p>
  
  <pre><code>module.exports = (baseConfig, env) =&gt; {
    const config = genDefaultConfig(baseConfig, env);
  
    config.module.rules.push({
      use: {
        loader: 'babel-loader',
        options: {
          presets: [
            ['env', {
              modules: false
            }],
            'react',
            'flow'
          ],
          plugins: [
            'transform-class-properties',
            'transform-object-rest-spread',
            'flow-react-proptypes'
          ]
        }
      }
    });
  
    return config;
  };
  </code></pre>
  
  <p>The commands runs with no errors under linux/mac. The issue only occurs with windows.</p>
  
  <p>node v8.5.0
  npm v5.4.2</p>