title: Why should not declare const variable in export default line in JavaScript ES6?
body: <p>I have declared const variable like,</p>
  
  <pre><code>"student.js"
   export default const mark= 20;
  </code></pre>
  
  <p>I am Calling this constant in index.js file</p>
  
  <pre><code>"index.js"
  import {mark} from './student';
  console.log("Mark Value ::::" + mark);
  </code></pre>
  
  <p>am getting error????</p>