title: regeneratorRuntime is not defined (how keep babel from including that polyfill?)
body: <p>I continue to get:</p>
  
  <blockquote>
    <p>App.jsx:11 Uncaught ReferenceError: regeneratorRuntime is not defined</p>
  </blockquote>
  
  <p>on any line that does an async. I don't what that polyfill, but I am having a hard time getting rid of it:</p>
  
  <pre><code>app.jsx:11)
  
   const fetcher = (async () =&gt; {
  
  </code></pre>
  
  <pre><code>  "@babel/cli": "^7.4.4",
     "@babel/core": "^7.4.4",
     "@babel/preset-env": "^7.4.4",
     "@babel/preset-react": "^7.0.0",
     "@types/react": "^16.8.17",
     "babel-preset-env": "^1.7.0"
  </code></pre>
  
  <p>here is the <code>.babelrc</code></p>
  
  <pre><code>{
      "presets": [
          [
              "@babel/preset-env",
              {
                  "targets": {
                      "chrome": "&gt;70",
                  },
                  "exclude": ["transform-regenerator"]
              },
              "@babel/preset-react"
          ]
      ]
  }
  </code></pre>