{"action":"opened","issue":{"url":"https://api.github.com/repos/thejameskyle/the-super-tiny-compiler/issues/41","repository_url":"https://api.github.com/repos/thejameskyle/the-super-tiny-compiler","labels_url":"https://api.github.com/repos/thejameskyle/the-super-tiny-compiler/issues/41/labels{/name}","comments_url":"https://api.github.com/repos/thejameskyle/the-super-tiny-compiler/issues/41/comments","events_url":"https://api.github.com/repos/thejameskyle/the-super-tiny-compiler/issues/41/events","html_url":"https://github.com/thejameskyle/the-super-tiny-compiler/issues/41","id":150643395,"number":41,"title":"how that _context thing work?","user":{"login":"1c7","id":1804755,"avatar_url":"https://avatars.githubusercontent.com/u/1804755?v=3","gravatar_id":"","url":"https://api.github.com/users/1c7","html_url":"https://github.com/1c7","followers_url":"https://api.github.com/users/1c7/followers","following_url":"https://api.github.com/users/1c7/following{/other_user}","gists_url":"https://api.github.com/users/1c7/gists{/gist_id}","starred_url":"https://api.github.com/users/1c7/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/1c7/subscriptions","organizations_url":"https://api.github.com/users/1c7/orgs","repos_url":"https://api.github.com/users/1c7/repos","events_url":"https://api.github.com/users/1c7/events{/privacy}","received_events_url":"https://api.github.com/users/1c7/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"milestone":null,"comments":0,"created_at":"2016-04-24T09:21:34Z","updated_at":"2016-04-24T09:21:34Z","closed_at":null,"body":"The only part I can't understand is **Transformer**\r\nhow transformer create that new AST confuse me.\r\n\r\n```javascript\r\nast._context = newAst.body;\r\n```\r\n```javascript\r\nCallExpression: function(node, parent) {.....\r\nNumberLiteral: function(node, parent) {...\r\n```\r\nhow three of them work together to create ast?\r\n\r\nCan you explain that in more detail way?\r\nThanks!"}}