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Nope. They're using V8 3.28.73 and libuv 1.0.2, both of which are abandoned by their maintainers.

iojs 1.1.0 V8 version 4.1.0.14 (current). nodejs 0.12 V8 version: 3.28.73 (>6 months old). More info here: https://iojs.org/es6.html

> I'm sharing part of my code between server and client

How? And why is it a problem with node but not iojss?

You can easily use the same framework both on the server and client, especially a general purpose one. Makes life easier.

io.js uses the current version of V8. node uses an outdated one.

Makes life easier if your code is being executed in the same engine, with the same version. Everything that works in one, works on the other.

Because Chrome and Firefox now provide many ES6 features which are missing from nodejs. But iojs tracks the latest stable v8 so it is feature-wise at the same level as Chrome.