Okay, i managed to run io.js (formerly node.js) in hlds, a little sneak peek:
Code:
setInterval(function () {
hlds.server_printf("helo from node\n");
}, 1000);
Code:
L 07/08/2015 - 17:17:34: helo from node
L 07/08/2015 - 17:17:35: helo from node
stats
CPU In Out Uptime Users FPS Players
7.00 0.00 0.00 0 0 652.79 0
L 07/08/2015 - 17:17:36: helo from node
L 07/08/2015 - 17:17:37: helo from node
So, ES6 + HLDS on the way.