Question: Is it possible to uglify all the RequireJS modules without concatenating them into a single file? (I know the other way round is possible with `optimize: "none"`).

Answer: 
From the description of [material design specs](https://www.google.com/design/spec/components/grid-lists.html#):

> 
> Grid Lists are an alternative to standard list views. Grid lists are
>  distinct from grids used for layouts and other visual presentations.
> 
> 
> 

If you are looking for a much lightweight Grid component library, I'm using [React-Flexbox-Grid](http://roylee0704.github.io/react-flexbox-grid/), the implementation of `flexboxgrid.css` in React.

On top of that, [React-Flexbox-Grid](http://roylee0704.github.io/react-flexbox-grid/) played nicely with both [material-ui](https://github.com/callemall/material-ui), and [react-toolbox](https://github.com/react-toolbox/react-toolbox) (the alternative material design implementation).
I hope this is not too late to give a response. 

I was also looking for a simple, robust, flexible and highly customizable bootstrap like react grid system to use in my projects.

The best I know of is `react-pure-grid` <https://www.npmjs.com/package/react-pure-grid>

`react-pure-grid` gives you the power to customize every aspect of your grid system, while at the same time it has built in defaults which probably suits any project

**Usage**

```
npm install react-pure-grid --save

```

-

```
import {Container, Row, Col} from 'react-pure-grid';

const App = () => (
      <Container>
        <Row>
          <Col xs={6} md={4} lg={3}>Hello, world!</Col>
        </Row>
        <Row>
            <Col xsOffset={5} xs={7}>Welcome!</Col>
        </Row>
      </Container>
);

```