javascript - Why can't I use Promise in node v0.11.11? - Stack Overflow

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I'm just messing around with the v0.11 branch of node, and I'm wondering why I can't use the native ES6 Promise object, even with --harmony turned on.

My normal chrome browsers:

Google Chrome    32.0.1700.77 (Official Build 244503) 
JavaScript       V8 3.22.24.10

Supports them, and node.js v0.11.11 is telling me:

> process.versions.v8
'3.22.24.19'

So what gives?

I'm just messing around with the v0.11 branch of node, and I'm wondering why I can't use the native ES6 Promise object, even with --harmony turned on.

My normal chrome browsers:

Google Chrome    32.0.1700.77 (Official Build 244503) 
JavaScript       V8 3.22.24.10

Supports them, and node.js v0.11.11 is telling me:

> process.versions.v8
'3.22.24.19'

So what gives?

• javascript
• node.js
• promise

Share Improve this question Follow asked Feb 13, 2014 at 12:17 user578895user578895 4

• 2 Promises currently in Chrome are DOM Futures. Also, they're very experimental and the API might change (it's quite heavily discussed atm). Consider using Bluebird promise instead as they're faster, have better stack traces and stable. – Benjamin Gruenbaum Commented Feb 13, 2014 at 12:18
• So basically because it's a DOM api and not a javascript API. – mpm Commented Feb 13, 2014 at 12:19
• 1 @mpm there are promises in ES6, they're just not 'settled' yet - the Chrome people are quite angry too : esdiscuss/topic/promise-cast-and-promise-resolve#content-77 – Benjamin Gruenbaum Commented Feb 13, 2014 at 12:21
• @BenjaminGruenbaum -- Well that explains why node doesn't have them, but why are they considered part of the DOM??? I've been using q forever, this isn't an issue of me wanting to find a library, just curious why it didn't work. If you post an answer, I'll accept it :) – user578895 Commented Feb 13, 2014 at 12:21

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1 Answer 1

Sorted by: Reset to default 10

Native Promises are in, you can now use them. They're still slower and harder to debug than libraries like Bluebird but they're there.

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Promises currently in Chrome are DOM Futures. Also, they're very experimental and the API might change (it's quite heavily discussed atm).

Consider using Bluebird promise instead as they're faster, have better stack traces and are stable.

It is consdierably faster than libraries like Q (two orders of magnitude faster) it has much better stack traces and a pletely spec pliant API. You may of course also pile node and v8 yourself - there are promises in v8 itself.

There are promises in ES6, they're just not 'settled' yet - making the Chrome people are quite angry too

They're considered part of the DOM too because future DOM APIs will use promises.

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