README.md

It is reported that `npm run build` can fail on machines with limited memory and no swap space, which is common in cloud environments. Even with small projects this command can increase RAM usage in your system by hundreds of megabytes, so if you have less than 1 GB of available memory your build is likely to fail with the following message: 

>  The build failed because the process exited too early. This probably means the system ran out of memory or someone called `kill -9` on the process.

If you are completely sure that you didn't terminate the process, consider [adding some swap space](https://www.digitalocean.com/community/tutorials/how-to-add-swap-on-ubuntu-14-04) to the machine you’re building on, or build the project locally.

### `npm run build` fails on Heroku

This may be a problem with case sensitive filenames.
Please refer to [this section](#resolving-heroku-deployment-errors).

### Moment.js locales are missing

If you use a [Moment.js](https://momentjs.com/), you might notice that only the English locale is available by default. This is because the locale files are large, and you probably only need a subset of [all the locales provided by Moment.js](https://momentjs.com/#multiple-locale-support).

To add a specific Moment.js locale to your bundle, you need to import it explicitly.<br>
For example:

```js
import moment from 'moment';
import 'moment/locale/fr';
```

If import multiple locales this way, you can later switch between them by calling `moment.locale()` with the locale name:

```js
import moment from 'moment';
import 'moment/locale/fr';
import 'moment/locale/es';

// ...

moment.locale('fr');
```

This will only work for locales that have been explicitly imported before.

## Something Missing?

If you have ideas for more “How To” recipes that should be on this page, [let us know](https://github.com/facebookincubator/create-react-app/issues) or [contribute some!](https://github.com/facebookincubator/create-react-app/edit/master/packages/react-scripts/template/README.md)