title: Configure Jest global tests setup with .ts file (TypeScript)
body: <p>I am using ts-jest (Jest and TypeScript) and want to configure
  some global setup for all test suites (initialize test database).</p>
  
  <p>I found that there is <code>globalSetup</code> options in jest configuration:</p>
  
  <pre><code>"jest": {
      "globalSetup": "./jest-config.js"
  }
  </code></pre>
  
  <p>but only <code>.js</code> file can be used for setup. I want to use <code>.ts</code> file because all my code
  including code for setup in TypeScript.</p>
  
  <p>How can I achieve this?</p>