When I should use render: h => h(App)? : <p>By the <a href="https://vuejs.org/v2/guide/render-function.html" rel="noreferrer">docs</a> I do not fully understand when I should use <code>render: h =&gt; h(App)</code> function.</p>

<p>For example I have very simple Vue app:</p>

<pre><code>import Vue from 'vue'
import App from './App.vue'

new Vue({
    el: '#app',
    components: { App }
})
</code></pre>

<p>What is the case when I need add to code: <code>render: h =&gt; h(App)</code>?</p>
