title: error TS2348: Value of type 'typeof ObjectID' is not callable. Did you mean to include 'new'?
body: <p>When I convert a <code>string</code> to <code>ObjectId</code>, I use</p>
  
  <pre><code>import * as mongoose from 'mongoose';
  
  const objId = mongoose.Types.ObjectId(strId);
  </code></pre>
  
  <p>It works well in <strong>TypeScript 1.x</strong>, after updating to <strong>TypeScript 2.x</strong>, I got the error:</p>
  
  <blockquote>
    <p>error TS2348: Value of type 'typeof ObjectID' is not callable. Did you
    mean to include 'new'?</p>
  </blockquote>
  
  <p>How can I solve it? Thanks</p>