support babel's import syntax

[tomatau]

Trying to work with a webpack bundle using babel to compile ES6 files and work with:

import DefaultExport from './File';

The inject loader doesn't work and ends up with:

TypeError: Cannot read property 'default' of undefined
    at inject (webpack:///./File.es6?./~/inject-loader:5:91)
    at Context.eval (webpack:///./test/File.es6?:19:17)

[thomasklein]

+1

[kpdecker]

What version of babel is this?

It's working fine for me under this version:

├─┬ babel-loader@4.3.0
│ ├─┬ babel-core@4.7.16
│ │ ├── acorn-babel@0.11.1-38
│ │ ├─┬ regenerator-babel@0.8.13-2

The code that is generated looks something like this:

var _interopRequire = function (obj) { return obj && obj.__esModule ? obj["default"] : obj; };

var EventEmitter = injections["events"].EventEmitter;
var Reflux = _interopRequire(injections["reflux"]);
var AuthActions = _interopRequire(injections["actions/authentication"]);

[plasticine]

I would like to actually add some test coverage around this and make sure it is working / ensure that it stay working.

[tomatau]

babel: ^5.0.0

The 5.0 introduces many big improvements but changes many of it's internals since 4.x around the module system.

[kpdecker]

This works for me under 5.0, but I am running with #7 merged (which appears to have been released under inject-loader 2.0.0).

    function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }
    var _reflux = (injections['reflux'] || __webpack_require__(116));
    var _reflux2 = _interopRequireDefault(_reflux);
...
        _reflux2['default']

My first guess, without seeing a repo case, is that the injection was missing, which causes the eventual .default reference to be undefined. I'm not seeing it locally as I have the failover from #7 in place. This is just a guess though.

@plasticine glad to try to PR some tests for this if I can make some time. It may be a few weeks, unfortunately.

[kpdecker]

I also had to do some hacks around the __esModule flag, which isn't really related to inject-loader persay, but we might be able to find a good utility or similar to help make that a bit more transparent.

[nkbt]

For me it works well, see example in https://github.com/in-flux/component-router/blob/master/test/Store-test.js and other tests in the repo.

Though there seems to be an issue when module exports more then one thing. Injector simply returns empty object in that case.

See example https://github.com/chenglou/react-motion/blob/f43b9365c3552d38d144358101b1496c7f4c716a/test/Spring-test.js

Not sure if it is helpful. I wanted to debug it later, maybe get some positive results

[nkbt]

Made a separate build:

/***/ },
/* 1 */
/***/ function(module, exports, __webpack_require__) {

module.exports = function inject(injections) {
var module = {exports: {}};
//import React, {PropTypes} from 'react';
'use strict';

exports.__esModule = true;
exports.updateCurrValue = updateCurrValue;
exports.updateCurrVelocity = updateCurrVelocity;

// ....

exports.TransitionSpring = TransitionSpring;
return module.exports;
}

So module.exports is never filled. Only exports. But injector returns module.exports.

If module exports default, then everything works fine:

/***/ },
/* 2 */
/***/ function(module, exports, __webpack_require__) {

module.exports = function inject(injections) {
var module = {exports: {}};
'use strict';

exports.__esModule = true;
exports['default'] = noVelocity;

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { 'default': obj }; }

var _lodashIsplainobject = (injections['lodash.isplainobject'] || __webpack_require__(3));

var _lodashIsplainobject2 = _interopRequireDefault(_lodashIsplainobject);

function noVelocity(coll) {
  if (Array.isArray(coll)) {
    return coll.every(noVelocity);
  }
  if (_lodashIsplainobject2['default'](coll)) {
    return Object.keys(coll).every(function (key) {
      return key === 'config' ? true : noVelocity(coll[key]);
    });
  }
  return typeof coll === 'number' ? coll === 0 : true;
}

module.exports = exports['default'];
return module.exports;
}

[rpominov]

Same issue here. When a module exports default and only default it works fine. But if it also exports something else, the result of injector(injections) is an empty object.

When I was trying to find the issue, I saw the same generated code as @nkbt posted. At the top it creates module variable, and returns module.exports at the bottom, but in the middle exports variable is used, which is an argument of upper function function(module, exports, __webpack_require__) {.

Seems like in case of importing default it works just by a coincidence.

Perhaps the code at the top of injector should be:

var module = {exports: {}};
var exports = module.exports;

[rpominov]

Ah, I see it already fixed by #11. Cool, waiting for release and install from github in meantime :+1:

[plasticine]

@rpominov Hey there, yep—hopefully fixed in #11. I’m back at a computer as of tomorrow, so I’ll try and verify everything is A-OK and ship a release then. :)

[rpominov]

Great, thank you! Btw, I just installed from github and it works fine for us :ok_hand:

[plasticine]

OK, I’ve published 2.0.1, which should hopefully fix the issues with Babel generated code. Please have a look and open a new issue if there are dramas. :heart:

[andyperlitch]

FYI, this appears to be broken in 3.0.0-beta2. We downgraded to 2.0.1 and it worked.