title: Babel file is copied without being transformed
body: <p>I have this code:</p>
  
  <pre><code>"use strict";
  
  import browserSync from "browser-sync";
  import httpProxy from "http-proxy";
  
  let proxy = httpProxy.createProxyServer({});
  </code></pre>
  
  <p>and I have installed <code>babel-core</code> and <code>babel-cli</code> globally via npm. The point is when I try to compile with this on my terminal:</p>
  
  <pre><code>babel proxy.js --out-file proxified.js
  </code></pre>
  
  <p>The output file gets copied instead of compiled (I mean, it's the same as the source file).</p>
  
  <p>What am I missing here?</p>