In Babel 6.5, plugin order appears to have been changed, breaking babel-plugin-transform-decorators-legacy and possibly others.
See the reference issue.
$ node build
/project/babel-broken-decorators/node_modules/babel-core/lib/transformation/file/index.js:585
throw err;
^
SyntaxError: /project/babel-broken-decorators/index.jsx: Decorators are not supported yet in 6.x pending proposal update.
3 |
4 | @ReactMixin({componentDidUpdate: console.log})
> 5 | class Foo extends React.Component {
| ^
6 | render() {
7 | return <span>Bar</span>;
8 | }
at File.buildCodeFrameError (/project/babel-broken-decorators/node_modules/babel-core/lib/transformation/file/index.js:436:15)