{"action":"opened","issue":{"url":"https://api.github.com/repos/Rich-Harris/estree-walker/issues/1","repository_url":"https://api.github.com/repos/Rich-Harris/estree-walker","labels_url":"https://api.github.com/repos/Rich-Harris/estree-walker/issues/1/labels{/name}","comments_url":"https://api.github.com/repos/Rich-Harris/estree-walker/issues/1/comments","events_url":"https://api.github.com/repos/Rich-Harris/estree-walker/issues/1/events","html_url":"https://github.com/Rich-Harris/estree-walker/issues/1","id":149342850,"number":1,"title":"Caching child keys not always valid","user":{"login":"tqc","id":543305,"avatar_url":"https://avatars.githubusercontent.com/u/543305?v=3","gravatar_id":"","url":"https://api.github.com/users/tqc","html_url":"https://github.com/tqc","followers_url":"https://api.github.com/users/tqc/followers","following_url":"https://api.github.com/users/tqc/following{/other_user}","gists_url":"https://api.github.com/users/tqc/gists{/gist_id}","starred_url":"https://api.github.com/users/tqc/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/tqc/subscriptions","organizations_url":"https://api.github.com/users/tqc/orgs","repos_url":"https://api.github.com/users/tqc/repos","events_url":"https://api.github.com/users/tqc/events{/privacy}","received_events_url":"https://api.github.com/users/tqc/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-04-19T04:02:12Z","updated_at":"2016-04-19T04:02:12Z","closed_at":null,"body":"I have some code including ES7 decorators parsed by acorn-es7.\r\n\r\nClassDeclaration.decorators is not always present, so caching the keys means that the decorator node is skipped unless the first class encountered happens to have a decorator.\r\n\r\nThe filter isn't really necessary given the check for value.type later, so removing the cache shouldn't have much of a performance impact."}}