Basic webpack not working for button click function - Uncaught Reference error: undefined
<p>I have a basic HTML page with a button:</p>

<pre><code>&lt;!DOCTYPE html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
  ...
&lt;/head&gt;
&lt;body&gt;
    &lt;button id="button" onclick="uclicked()"&gt;Click me&lt;/button&gt;
    &lt;script src="./bundle.js"&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>and an <code>app.js</code>:</p>

<pre><code>//(function(){
    console.log('started up')
    function uclicked(){
        console.log('You clicked');
    }
//})();
</code></pre>

<p>webpack is installed and <code>webpack --watch</code> succeeds. The webpack.config.js is:</p>

<pre><code>module.exports={
    entry: './app.js',
    output: {
        path: __dirname,
        filename: 'bundle.js'
    }
}
</code></pre>

<p>When I load the page <code>console.log</code> is working but when I push the button I get <code>Uncaught ReferenceError: uclicked is not defined</code>.</p>

<p>If I replace <code>&lt;script src="./bundle.js"&gt;&lt;/script&gt;</code> with <code>&lt;script src="./app.js"&gt;&lt;/script&gt;</code> and bypass webpack the button clicks fine. Why doesn't this basic webpack setup work?</p>