dot.dom: A feature-rich JavaScript template engine in 510 byes

I created a codepen where you can try it in action: <a href="https:&#x2F;&#x2F;codepen.io&#x2F;anon&#x2F;pen&#x2F;Kargex?editors=0010#0" rel="nofollow">https:&#x2F;&#x2F;codepen.io&#x2F;anon&#x2F;pen&#x2F;Kargex?editors=0010#0</a>

What is this syntax? const {clicks=0} = state;