How to make Chai print assertion's parameter name instead of it's value
<p>I use Mocha with Chai for testing. Mocha shows the whole test's code when you expand test case with left mouse click in browser, but when any of Chai's assertions fail, I get something like:</p>

<p><strong>Expected undefined to exist</strong></p>

<p>Such case is pretty hard to find if textual description wasn't originally given to assertion as it's second argument.
Is there a way to get something like</p>

<p><strong>Expected foo.bar to exist</strong></p>

<p>P.S. I use webpack, so assertion's line number means nothing (it's possible to find through file generated by webpack, but it's hard).</p>