title: Using Sapper ESM module loader in node: `import *` fails
body: <p>I wish to use an ES2015 module for a project. Per <a href="https://nodejs.org/docs/latest-v10.x/api/esm.html" rel="nofollow noreferrer">the node documentation, I am enabling the <code>.esm</code> loader</a>:</p>
  
  <pre><code>~\Code\spa-test $ node --experimental-modules                                                                           (node:8104) ExperimentalWarning: The ESM module loader is experimental.                                               
  
  &gt; import * as sapper from '@sapper/server';                                                                             Thrown:
  import * as sapper from '@sapper/server';
         ^
  
  SyntaxError: Unexpected token *
  </code></pre>
  
  <p>I have also tried:</p>
  
  <pre><code>import {middleware} from '@sapper/server';
  </code></pre>
  
  <p>Which fails with <code>SyntaxError: Unexpected token {</code></p>
  
  <p>How do I make node.js load the <code>@sapper/server</code> ESM module?</p>