title: Initializers are not allowed in ambient contexts error when installing Blueprint
body: <p>I'm trying to use the <code>@blueprintjs/core</code> library in my project. However, when I compile my code, I'm getting many errors like this:</p>
  
  <pre><code>node_modules/@blueprintjs/core/dist/common/classes.d.ts(4,30):
    error TS1039: Initializers are not allowed in ambient contexts.
  </code></pre>
  
  <p>What's going on? What am I doing wrong?</p>