payload: {"action":"opened","issue":{"url":"https://api.github.com/repos/rollup/rollup/issues/3054","repository_url":"https://api.github.com/repos/rollup/rollup","labels_url":"https://api.github.com/repos/rollup/rollup/issues/3054/labels{/name}","comments_url":"https://api.github.com/repos/rollup/rollup/issues/3054/comments","events_url":"https://api.github.com/repos/rollup/rollup/issues/3054/events","html_url":"https://github.com/rollup/rollup/issues/3054","id":479594515,"node_id":"MDU6SXNzdWU0Nzk1OTQ1MTU=","number":3054,"title":"`interopRequireDefault` called with undefined argument","user":{"login":"camille-hdl","id":516907,"node_id":"MDQ6VXNlcjUxNjkwNw==","avatar_url":"https://avatars0.githubusercontent.com/u/516907?v=4","gravatar_id":"","url":"https://api.github.com/users/camille-hdl","html_url":"https://github.com/camille-hdl","followers_url":"https://api.github.com/users/camille-hdl/followers","following_url":"https://api.github.com/users/camille-hdl/following{/other_user}","gists_url":"https://api.github.com/users/camille-hdl/gists{/gist_id}","starred_url":"https://api.github.com/users/camille-hdl/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/camille-hdl/subscriptions","organizations_url":"https://api.github.com/users/camille-hdl/orgs","repos_url":"https://api.github.com/users/camille-hdl/repos","events_url":"https://api.github.com/users/camille-hdl/events{/privacy}","received_events_url":"https://api.github.com/users/camille-hdl/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2019-08-12T11:25:59Z","updated_at":"2019-08-12T11:25:59Z","closed_at":null,"author_association":"NONE","body":"<!--\r\n  ⚡️ katchow! We 💛 issues.\r\n\r\n  Please - do not - remove this template.\r\n  Please - do not - skip or remove parts of this template.\r\n  Or your issue may be closed.\r\n\r\n  👉🏽 Need help or tech support? Please don't open an issue!\r\n  Head to https://gitter.im/rollup/rollup or https://stackoverflow.com/questions/tagged/rollupjs\r\n\r\n  ❤️ Rollup? Please consider supporting our collective:\r\n  👉 https://opencollective.com/rollup/donate\r\n-->\r\n\r\n- Rollup Version: 1.19.4\r\n- Operating System (or Browser): OSX\r\n- Node Version: 12.8.0\r\n\r\n### How Do We Reproduce?\r\n\r\n<!--\r\n  Issues without minimal reproductions will be closed! Please provide one by:\r\n  1. Using the REPL at https://rollupjs.org/repl/, or\r\n  2. Work to isolate the problem and provide the exact steps in this issue, or\r\n  3. Provide a minimal repository link (Read https://git.io/fNzHA for instructions).\r\n     These may take more time to triage than the other options.\r\n-->\r\nClone https://github.com/camille-hdl/rollup-yaml-bug  and \r\nfollow the instructions in the readme (nothing weird: install, build, run)\r\n\r\n\r\nIn the [yaml](https://www.npmjs.com/package/yaml) package, `Collection` and `Pair`  are modules dependent on each other.  \r\n`Pair` requires `Collection` and `Collection` requires `Pair`.  \r\n\r\n### Expected Behavior\r\n\r\nIn the output, `Collection` is available in `Pair`.  \r\n\r\n### Actual Behavior\r\n\r\nIn `var Pair_1 = createCommonjsModule(function (module, exports) {`,  \r\nthere is `var _Collection = interopRequireDefault(Collection_1$1);` when `Collection_1$1` is undefined.  \r\n\r\n`var Collection_1$1 = createCommonjsModule(function (module, exports) {...` is defined later.\r\n\r\nAt some point in the execution of code inside `Pair_1`, this statement `someVar instanceof _Collection.default` throws, because `_Collection.default` is undefined.  \r\n\r\n<!--\r\n  Most issues can be expressed or demonstrated through the REPL or a repository.\r\n  However, the situation may arise where some small code snippets also need to\r\n  be provided. In that situation, please add your code below using\r\n  Fenced Code Blocks (https://help.github.com/articles/creating-and-highlighting-code-blocks/)\r\n-->\r\n\r\nThank you for your time!\r\n\r\n"}}
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