Sebastian Markbage 54be9b535c Re-land typed descriptors and printer (#2511) ... Summary: Release notes: landing two previously reverted PRs I found the issue. Flow doesn't support optional fields in classes. This effectively becomes enforced with Babel 7 since it treats the type annotations as field initializers. Which means that these fields always gets created. We happened to only use this newer plugin for class fields internally which broke our builds only there. 2b4546d Use `undefined` instead of missing to represent absent field in descriptors. Fixed all the callsites that checks for `hasOwnProperty` or `in` that I could find. 922d40c Fixes a Flow issue in the text printer. I filed a [follow up issue for ObjectValue](https://github.com/facebook/prepack/issues/2510) since it has the same problem. Pull Request resolved: https://github.com/facebook/prepack/pull/2511 Reviewed By: trueadm Differential Revision: D9569949 Pulled By: sebmarkbage fbshipit-source-id: f8bf84c4385de4f0ff6bcd45badacd3b8c88c533		2018-08-31 05:54:23 -07:00
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config.yml	Re-land typed descriptors and printer (#2511)	2018-08-31 05:54:23 -07:00