ModuleSpecifier: include ".js" or not?

[monolithed]

This question has already been asked
https://mail.mozilla.org/pipermail/es-discuss/2015-February/041430.html


I prefer to follow the following rules:


#### File structure

```
root/
   foo/
       index.js

```

#### Export module

```js
   export default foo class () {}
```

#### Import module

```js
import foo from './foo';
```
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