iojs --harmony_modules flag

Hey guys,
it seems that I am the only one who wanted to fiddle around with es6 modules recently which are -yes I know- work in progress, but still. Since the docs aren't entirely clear about the current state of the es6-modules-implementation and the actual implementation proposal doesn't work I was wondering what the current state of the --harmony_modules flag is? Other than that you guys did an awesome job pushing node.js to its best. Thanks!

Greets, krnl

Afaik, --harmony_modules is a very much in progress feature on V8. While it is currently listed as "in progress", I find very little references to it on the source code. I think we are still a long way off having ES6 module support on io.js. There are some interesting shims though if you want to experiment a bit.

Thanks for the fast response. Yes traceur and 6to5 et al do their job, but I was hoping to finally remove that transpile-step.

Well then. Thank you anyways! :)

For everyone interested in the current state of es6-modules, follow this link.

There was a very interesting discussion on 6to5 regarding modules interop (babel/babel#95), which is something that will be a concern to every module author in the future.

Interesting indeed! Nice follow up. Thanks for ruining my night while reading the complete discussion :)

I found a page listed a compatibility table.
http://kangax.github.io/compat-table/es6/

I'm not sure how credible is it in this table about iojs.

In my test code I found I can use yield key word in iojs, but iterator are not supported in iojs.

@speedneeder

@speedneeder I was the one submitting the results for io.js. Iterators are supported by io.js. Example from MDN:

function makeIterator(array){
  var nextIndex = 0;

  return {
    next: function(){
      return nextIndex < array.length ?
        { value: array[nextIndex++], done: false } : { done: true };
       }
    };
}

var it = makeIterator(['yo', 'ya']);

console.log(it.next().value); // 'yo'
console.log(it.next().value); // 'ya'
console.log(it.next().done);  // true

I would like to request this issue to tc-agenda.
If harmony_module is implemented by v8, How npm will resolve module names.

npm/npm#4323
https://gist.github.com/domenic/4748675

@ruimarinho

@ruimarinho
I have read some tutorial about iterator of javascript, it gives some code like below, and I test it in firefox, it works:

var lang = { name: 'JavaScript', birthYear: 1995 };
var it = Iterator(lang);
var pair = it.next(); //["name", "JavaScript"]
console.log(pair);

but when I run it with iojs, it says:

    var it = Iterator(lang);
             ^
ReferenceError: Iterator is not defined
    at Object.<anonymous> (F:\Study\node.js\netspider\test.js:2:14)
    at Module._compile (module.js:446:26)
    at Object.Module._extensions..js (module.js:464:10)
    at Module.load (module.js:341:32)
    at Function.Module._load (module.js:296:12)
    at Function.Module.runMain (module.js:487:10)
    at startup (node.js:111:16)
    at node.js:809:3

It seems like the key word "Iterator" is not supported in iojs.

Don't you think this is a bit off-topic here?

V8 has not started implementing modules at all.

@domenic

@domenic well, this works:

require('vm').runInThisContext(`
  module B {
    export let a = 42;
  }
`);

Whatever it is

Yes, that is not ES6, that is from a few years ago before ES6.

@domenic

What @domenic said. (This is not implemented in v8 yet.)

Thanks guys!

something is happening: v8/v8@aeb3a71

For further import and export syntax reference:

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iojs --harmony_modules flag #518

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iojs --harmony_modules flag #518

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ruimarinho commented on Jan 19, 2015

krnlde commented on Jan 19, 2015

ruimarinho commented on Jan 19, 2015

krnlde commented on Jan 19, 2015

speedneeder commented on Jan 20, 2015

ruimarinho commented on Jan 20, 2015

yosuke-furukawa commented on Jan 20, 2015

speedneeder commented on Jan 20, 2015

krnlde commented on Jan 20, 2015

domenic commented on Jan 21, 2015

vkurchatkin commented on Jan 21, 2015

domenic commented on Jan 21, 2015

Fishrock123 commented on Jan 22, 2015

krnlde commented on Jan 22, 2015

vkurchatkin commented on Jan 28, 2015

krnlde commented on Feb 2, 2015

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