// @flow
var React = require('react');
var A = React.createClass({
propTypes: { foo: React.PropTypes.string.isRequired }
});
var B = React.createClass({
propTypes: { bar: React.PropTypes.string.isRequired }
});
function f(b): React.Element<*> {
if (b) {
return ;
} else {
return ;
}
}