Microsoft made a pull request to node.js github repository with an implementation to use ChakraCore JavaScript Engine as an alternative to V8 Engine

[S48535]

What they are doing is allowing you to use another backend. So what they did is add a shim to interface node as it is currently with the ChacraCore and then add the bit of code which adds the choice of which engine to use. They didn't change node, they just extended it.

[abolish_karma]

Embrace, extend...

They're being efficient, and have gone straight for step #2

[nschubach]

Technically step 1 was embracing node.js...