es6 modules

[queckezz]

So I tried to use the es6 syntax today and I ran into multiple issues with it.

• Not compatible with commonjs modules. If I try to require import store from 'store' and it doesn't require it because it gets rewritten into var store = require('store')['default'] so it's just consumable if store is also written with es6 modules.
• breaks on export statement but not export default.
• Doesn't support import { x as a } ..., export { x as a }

I know that you reported some of the issues to es6-module-transpiler but they don't seem very active. What do you think of using https://github.com/andreypopp/es6-module-jstransform? This resolves all the above issues. A downside though is that it compiles to pretty ugly code:

var mod$0 = require("./mod.js");
module.exports.x = mod$0.x;
var mod$1 = require("./mod.js");
module.exports.x = mod$1.x;
module.exports.y = mod$1.y;
var mod$2 = require("./mod.js");
module.exports.y = mod$2.x;
var mod$3 = require("./mod.js");
module.exports.y = mod$3.x;
module.exports.b = mod$3.y;

But for me not really a problem since it's just the build output anyway.

[jonathanong]

+1. thank for putting in the time to find actual cases that fail! i don't really care about which transpiler we use, but adding test cases for every issue we find would be useful. doesn't help that ES6 modules aren't standardized yet =/

don't really care about the build output.

[andreypopp]

Hi,

I've released 0.1.3 which preserves line info and doesn't generate unneeded vars when there's only single specifier to export/import, so the output above looks like now:

module.exports.x = require("./mod.js").x;
var mod$0 = require("./mod.js");module.exports.x = mod$0.x;module.exports.y = mod$0.y;
module.exports.y = require("./mod.js").x;
var mod$1 = require("./mod.js");module.exports.y = mod$1.x;module.exports.b = mod$1.y;

Also, I developed this transform to be compatible with CommonJS modules but I'm not sure yet I did this aspect right because I didn't put this transform to production use yet.

[jonathanong]

so far, it's better than square's transpiler in that it actually works :D

[jonathanong]

btw is there a cjs -> es6 module compiler?

[bodokaiser]

+1 on this too.

Currently debugging is real pain. You either get syntax error on line 1 (what fucking file??) or just undefined. I guess this would be solved too by using a different transformer.

[timaschew]

related to #2