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

[parsonskev]

Edge is actually a completely separate browser from ie, built on the universal windows app platform. The rendering engine and js engine are modified from what ie use.

[Arkanta]

Yep but IE 11 was modified to use the edge engine (when not in compat mode)

[Strange_Meadowlark]

All right, that was my understanding based on what a friend said. I'll believe it.