{"action":"opened","issue":{"url":"https://api.github.com/repos/tomwanzek/d3-ng2-demo/issues/9","repository_url":"https://api.github.com/repos/tomwanzek/d3-ng2-demo","labels_url":"https://api.github.com/repos/tomwanzek/d3-ng2-demo/issues/9/labels{/name}","comments_url":"https://api.github.com/repos/tomwanzek/d3-ng2-demo/issues/9/comments","events_url":"https://api.github.com/repos/tomwanzek/d3-ng2-demo/issues/9/events","html_url":"https://github.com/tomwanzek/d3-ng2-demo/issues/9","id":181015911,"number":9,"title":"Dumb question","user":{"login":"bob44240","id":5818052,"avatar_url":"https://avatars.githubusercontent.com/u/5818052?v=3","gravatar_id":"","url":"https://api.github.com/users/bob44240","html_url":"https://github.com/bob44240","followers_url":"https://api.github.com/users/bob44240/followers","following_url":"https://api.github.com/users/bob44240/following{/other_user}","gists_url":"https://api.github.com/users/bob44240/gists{/gist_id}","starred_url":"https://api.github.com/users/bob44240/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bob44240/subscriptions","organizations_url":"https://api.github.com/users/bob44240/orgs","repos_url":"https://api.github.com/users/bob44240/repos","events_url":"https://api.github.com/users/bob44240/events{/privacy}","received_events_url":"https://api.github.com/users/bob44240/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-10-04T21:59:16Z","updated_at":"2016-10-04T21:59:16Z","closed_at":null,"body":"I don't understand some of the syntax used by the service.  For example:  \r\n_`let d3ParentElement: Selection<HTMLElement, any, null, undefined>;`_\r\n\r\nIs this defining Selection as a function that takes 4 parameters of the type HTMLElement, any, etc?\r\n\r\nCan you point me to a resource describing this approach?"}}
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