Windbg, Microsoft’s Windows system debugger, has been released with new features, one of which is ability to write debugger scripts in JavaScript.
(WordPress renders the MSDN blog URL strangely, if you can’t click on that, click on the URL in Alex’s twtter.)
https://blogs.msdn.microsoft.com/windbg/2016/10/27/new-insider-sdk-and-javascript-extensibility/