Node: --harmony_modules isn't working?

[tusharmath]

Following the documentation given here https://nodejs.org/en/docs/es6/

Sample Code

import {partial} from 'lodash'
console.log(partial)

command

node --harmony_modules  Javascript.js
/Users/tushar.mathur/Documents/Projects/temp/Javascript.js:1
(function (exports, require, module, __filename, __dirname) { import {partial} from 'lodash'
                                                              ^^^^^^

SyntaxError: Unexpected token import
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:413:25)
    at Object.Module._extensions..js (module.js:452:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:475:10)
    at startup (node.js:117:18)
    at node.js:951:3
➜  temp

OS: Mac OS 10.10.4
Node: 4.0.0

[fl0w]

Same results here, also on OS X (also with strict mode).
However, I'm not sure it is expected to work - I'm still transforming with BabelJS.

[tusharmath]

I guess I tweeted too soon :'(

Yay! ES6 modules finally :) https://t.co/g9oKPYXEEw

— Tushar Mathur (@tusharmath) September 8, 2015

[fl0w]

modules are still in 'in progress' in v8 - so I'd withdraw that tweet anyway!

$ node --v8-options | grep 'in progress' 

[tusharmath]

Well, I wanted to experiment with them without using a transpiler which I finally could (Or can't).

[ilkkao]

See this comment: https://code.google.com/p/v8/issues/detail?id=1569#c29

V8 developers are currently waiting WHATWG loader spec to mature before completing the ES2015 module support.

[bnoordhuis]

Closing. As others point out, ES6 modules are not implemented in V8 yet. As a rule of thumb, if a feature is behind a flag, you can expect it to be half-baked or downright broken.

[nguyenchilong]

I have problem with '--harmony' in command, and use AppJS module node --harmony ./app/app.js and after run then have error 'AppJS requires Node is run with the --harmony command line flag' pls help me for this error. I use xubuntu OS node v4.2.2.
have add '--harmony' or no then always show error message 'throw new Error ('AppJS requires Node is run with the --harmony command line flag'); ^
Error: AppJS requires Node is run with the --harmony command line flag
at Object. (/var/www/tutorial/app/node_modules/appjs/lib/index.js:2:9)
at Module._compile (module.js:435:26)
at Object.Module._extensions..js (module.js:442:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:311:12)
at Module.require (module.js:366:17)
at require (module.js:385:17)
at Object. (/var/www/tutorial/app/app.js:3:11)
at Module._compile (module.js:435:26)
at Object.Module._extensions..js (module.js:442:10)'

[Globik]

And by now what? Is import implemented in node.js 6.0?

[fl0w]

AFAIK, V8 still doesn't support import/export, and thus neither does node.js v6.

[d3x0r]

https://bugs.chromium.org/p/v8/issues/detail?id=1569

Mar 16, 2016

Remove --harmony-modules flag and let embedder decide when modules are used

Modules already have a separate entrypoint into the engine (at the moment,
this is v8::ScriptCompiler::CompileModule, though that will change to
something like ParseModule). This meant that requiring a commandline flag
simply added an extra complexity burden on embedders. By removing the v8
flag, this lets embedders use their own flagging mechanism (such as d8's
"--module", or Blink's RuntimeEnabledFeatures) to control whether
modules are to be used.

Also remove old modules tests that were being skipped (since they test
very old, pre-ES2015 modules syntax).

[quantuminformation]

sad

[skrat]

Yeah, keep the ticket closed. Modules in JS will never be truly standardized, and if they will, the standard will be obsolete or deprecated the next day, by a new solution, "new standard". Sad.

[cweilguny]

As node 6.5.0 still throws up on import ..., I guess it's still not in V8? Any news on that?
http://node.green/ is a great resource, but is there module support shown in any way?

[simonbengtsson]

V8 now has support for modules! And implementation has started in chromium 🎉🏆🎊 https://bugs.chromium.org/p/chromium/issues/detail?id=594639#c9

[avesus]

Node 9.3.0 still not supported.

[devsnek]

@avesus i believe modules are slated for node 10 (i don't know if they will be backported). however you can use them in nightly builds with --experimental-modules