Win10 will support Chakra Javascript engine across multiple applications.

Computer Store News: We already know that on the Windows 10 platform, the Chakra JavaScript engine will support Microsoft Edge and Windows applications written in HTML/CSS/JS, then Other parts of the browser? Many developers have asked Microsoft to extend the support of the Chakra JavaScript engine to areas outside the browser, such as JavaScript-programmable support for local/management applications across clients and servers. With Windows 10, Microsoft is making some major improvements in this area.

Microsoft wrote in the official Windows blog: "In Windows 10, we have made significant progress against the JSRT API, allowing them to support Chakra engines across different application types. Get the highest priority. Developers can now use these APIs to add Chakra engine support in scripting classic Win32 applications and general Windows applications. These APIs now provide underlying access and support for the generic Windows platform and ECMAScript 6, respectively. For example, the Chakra-based Node.js platform recently released for Windows 10 IoT devices was built using these APIs. ”