You can start with <a href="https:&#x2F;&#x2F;github.com&#x2F;DigitalMars&#x2F;DMDScript" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;DigitalMars&#x2F;DMDScript</a> which is an open source (Boost licensed) JavaScript engine written in D.