title: How to hide source code of a function like angular website?
body: <p>If you open the developer tools in the AngularJS website, some functions stay with the source code hidden.
  Is there a way to do it?</p>
  
  <p>Example:
  <a href="https://i.stack.imgur.com/zuM2d.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/zuM2d.png" alt="angular-site"></a></p>
  
  <p>The function toString is returning a classic "native code" of javascript native/pre-compiled functions instead returning the real source code.</p>