React-Bootstrap - importing modules

react-bootstrap doesn't have a default export, so the default import syntax (import ReactBootstrap from 'react-bootstrap') cannot be used in this case. You can do the following though:

import * as ReactBootstrap from 'react-bootstrap';

<ReactBootstrap.Button bsStyle="success" bsSize="small">
  Something
</ReactBootstrap.Button>

The answer provided by Nick is not recommended as it will bloat your component.

Rather use the named imports however in a better syntax.

import { Button,  ButtonGroup, DropdownButton, MenuItem } from 'react-bootstrap';

This way you know what you are importing and keep the component size to a minimum