{"action":"opened","issue":{"url":"https://api.github.com/repos/systemjs/systemjs/issues/449","labels_url":"https://api.github.com/repos/systemjs/systemjs/issues/449/labels{/name}","comments_url":"https://api.github.com/repos/systemjs/systemjs/issues/449/comments","events_url":"https://api.github.com/repos/systemjs/systemjs/issues/449/events","html_url":"https://github.com/systemjs/systemjs/issues/449","id":75982504,"number":449,"title":"Executing SFX bundle on a page that already has System","user":{"login":"OliverJAsh","id":921609,"avatar_url":"https://avatars.githubusercontent.com/u/921609?v=3","gravatar_id":"","url":"https://api.github.com/users/OliverJAsh","html_url":"https://github.com/OliverJAsh","followers_url":"https://api.github.com/users/OliverJAsh/followers","following_url":"https://api.github.com/users/OliverJAsh/following{/other_user}","gists_url":"https://api.github.com/users/OliverJAsh/gists{/gist_id}","starred_url":"https://api.github.com/users/OliverJAsh/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/OliverJAsh/subscriptions","organizations_url":"https://api.github.com/users/OliverJAsh/orgs","repos_url":"https://api.github.com/users/OliverJAsh/repos","events_url":"https://api.github.com/users/OliverJAsh/events{/privacy}","received_events_url":"https://api.github.com/users/OliverJAsh/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2015-05-13T13:23:56Z","updated_at":"2015-05-13T13:23:56Z","closed_at":null,"body":"When executing SFX bundle on a page that already has System, `window.System` is overridden.\r\n\r\nCould the SFX bundle check for the existence of `window.System` and only set it if it does not already exist?\r\n\r\n/cc @mattosborn"}}