Material-ui error (Missing class properties transform.)

Question

I have been trying to set the material-ui theme in Meteor with react-mounter to mount the components.

I was having issues setting it then I extended the component so that I could set the theme using the examples on the material-ui site.

I now get the following error message.

client/components/navbar.jsx:14:4: /client/components/navbar.jsx: Missing class properties transform.

Here is the navbar sample code

import React from 'react';
import AppBar from 'material-ui/AppBar';
import IconButton from 'material-ui/IconButton';
import Navigationclose from 'material-ui/svg-icons/navigation/close';
import IconMenu from 'material-ui/IconMenu';
import NavigationMoreVert from 'material-ui/svg-icons/navigation/more-vert';
import MenuItem from 'material-ui/MenuItem';
import baseTheme from 'material-ui/styles/baseThemes/lightBaseTheme';
import getMuiTheme from 'material-ui/styles/getMuiTheme';


class Navbar extends React.Component {

    childContextTypes: {
    muiTheme: React.PropTypes.object.isRequired
    }

    getChildContext() {
        return {muiTheme: getMuiTheme(baseTheme)};
    }

    render() {

        return (<AppBar
            title="Title"
            iconElementLeft={<IconButton><Navigationclose /></IconButton>}
            iconElementRight={
           <IconMenu
               iconButtonElement={
                <IconButton><NavigationMoreVert /></IconButton>
              }
               targetOrigin={{horizontal: 'right', vertical: 'top'}}
              anchorOrigin={{horizontal: 'right', vertical: 'top'}}
          >
              <MenuItem primaryText="Refresh"/>
                <MenuItem primaryText="Help"/>
              <MenuItem primaryText="Sign out"/>
           </IconMenu>
        }
        />);
    }
}


export default Navbar;

Here is the router.jsx

import React from 'react';
import {mount} from 'react-mounter';
import {MainLayout} from '/client/layouts/mainLayout.jsx';
import Content from '/client/components/content.jsx';
import Navbar from '/client/components/navbar.jsx';
import Footer from '/client/components/footer.jsx';

FlowRouter.route("/", {
    action () {
    mount(MainLayout, {
            navbar: <Navbar/>,
        content: <Content/>,
        footer: <Footer/>
});
}
});

Answer 1

You need a Babel transform. Meteor 1.3.3+ supports additional plugins and presets via .babelrc

Install the static transform:

npm install babel-plugin-transform-class-properties

# .babelrc
{
  "presets": [
    "meteor",
    "es2015",
    "stage-1"
  ],

  "plugins": [
    "transform-class-properties"
  ]
}

Support in Meteor 1.3.3

The transform