{"action":"closed","issue":{"url":"https://api.github.com/repos/react-bootstrap/react-bootstrap/issues/474","labels_url":"https://api.github.com/repos/react-bootstrap/react-bootstrap/issues/474/labels{/name}","comments_url":"https://api.github.com/repos/react-bootstrap/react-bootstrap/issues/474/comments","events_url":"https://api.github.com/repos/react-bootstrap/react-bootstrap/issues/474/events","html_url":"https://github.com/react-bootstrap/react-bootstrap/issues/474","id":66032649,"number":474,"title":"Super expression must either be null or a function, not undefined in 0.20.0","user":{"login":"lukemcgregor","id":1284608,"avatar_url":"https://avatars.githubusercontent.com/u/1284608?v=3","gravatar_id":"","url":"https://api.github.com/users/lukemcgregor","html_url":"https://github.com/lukemcgregor","followers_url":"https://api.github.com/users/lukemcgregor/followers","following_url":"https://api.github.com/users/lukemcgregor/following{/other_user}","gists_url":"https://api.github.com/users/lukemcgregor/gists{/gist_id}","starred_url":"https://api.github.com/users/lukemcgregor/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lukemcgregor/subscriptions","organizations_url":"https://api.github.com/users/lukemcgregor/orgs","repos_url":"https://api.github.com/users/lukemcgregor/repos","events_url":"https://api.github.com/users/lukemcgregor/events{/privacy}","received_events_url":"https://api.github.com/users/lukemcgregor/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":1,"created_at":"2015-04-02T23:36:18Z","updated_at":"2015-04-03T03:31:33Z","closed_at":"2015-04-03T03:31:33Z","body":"I upgraded from 0.16.1 to 0.20.0 and got an error `Super expression must either be null or a function, not undefined`\r\n\r\nThis seems to be to do with some autogen code from an ES6 upgrade. Is this an issue with the library or do I need to do something to fix @ my end"}}