Visual Studio 2015 comes with several useful third-party tools installed and integrated with IDE. Those include Node.js, npm, git client, etc. Task Runner Explore window, that was a separate extension in VS2013, is now part of the default installation and allows to run task defined for Gulp or Grunt.
What I have noticed stumbling into a problem recently, is that those tools (so far) didn’t get any updates – there’s nothing in Extensions and Updates, Windows Update or Notifications panel in Visual Studio related to those tools that would suggest that update is needed. Still, the world goes on. Node.js has recently released it’s 4.0.0 version (a big jump in numeration from 0.12.7 released before), but the image I currently have in \Microsoft Visual Studio 14.0\Common7\IDE\Extensions\Microsoft\Web Tools\External\node\node.exe is at version 0.10.31, so this executable is currently over 1 year old.