Add support for import() 

VSCode: 1.12.1

I'm using Webpack 2 `import()` to dynamically load a scss file like this:
```javascript
import("./styles/main.scss");
```

VSCode throws the following error:

> severity: 'Error'
> message: 'Declaration or statement expected.'
> at: '1,1'
> source: 'js'

Is there any way to suppress this error?