{"action":"created","issue":{"url":"https://api.github.com/repos/facebook/create-react-app/issues/5995","repository_url":"https://api.github.com/repos/facebook/create-react-app","labels_url":"https://api.github.com/repos/facebook/create-react-app/issues/5995/labels{/name}","comments_url":"https://api.github.com/repos/facebook/create-react-app/issues/5995/comments","events_url":"https://api.github.com/repos/facebook/create-react-app/issues/5995/events","html_url":"https://github.com/facebook/create-react-app/issues/5995","id":388969936,"node_id":"MDU6SXNzdWUzODg5Njk5MzY=","number":5995,"title":"Allow Flow build-time type checking","user":{"login":"gino-m","id":228050,"node_id":"MDQ6VXNlcjIyODA1MA==","avatar_url":"https://avatars2.githubusercontent.com/u/228050?v=4","gravatar_id":"","url":"https://api.github.com/users/gino-m","html_url":"https://github.com/gino-m","followers_url":"https://api.github.com/users/gino-m/followers","following_url":"https://api.github.com/users/gino-m/following{/other_user}","gists_url":"https://api.github.com/users/gino-m/gists{/gist_id}","starred_url":"https://api.github.com/users/gino-m/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/gino-m/subscriptions","organizations_url":"https://api.github.com/users/gino-m/orgs","repos_url":"https://api.github.com/users/gino-m/repos","events_url":"https://api.github.com/users/gino-m/events{/privacy}","received_events_url":"https://api.github.com/users/gino-m/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":3,"created_at":"2018-12-08T23:35:07Z","updated_at":"2018-12-10T07:53:02Z","closed_at":null,"author_association":"NONE","body":"Would it be possible to enable Flow type checks at build time (e.g., [like this](https://codeburst.io/hardening-the-react-build-part-2-7e99165a3d84)) without requiring an eject + custom webpack config (#1592)? Opening this issue since #4097 was flagged as a question instead of an feature request, and closed without much explanation.\r\n\r\nIt seems a pity that atm we can't get both the up-to-date integration goodness of cra, and the static type safety of Flow*. It would be a big win if this were supported, imo. Thanks!\r\n\r\n*I assuming manual build steps don't count as part of the build process, since they're optional and entirely up to the developer to know about and execute."},"comment":{"url":"https://api.github.com/repos/facebook/create-react-app/issues/comments/445722663","html_url":"https://github.com/facebook/create-react-app/issues/5995#issuecomment-445722663","issue_url":"https://api.github.com/repos/facebook/create-react-app/issues/5995","id":445722663,"node_id":"MDEyOklzc3VlQ29tbWVudDQ0NTcyMjY2Mw==","user":{"login":"bugzpodder","id":14841421,"node_id":"MDQ6VXNlcjE0ODQxNDIx","avatar_url":"https://avatars3.githubusercontent.com/u/14841421?v=4","gravatar_id":"","url":"https://api.github.com/users/bugzpodder","html_url":"https://github.com/bugzpodder","followers_url":"https://api.github.com/users/bugzpodder/followers","following_url":"https://api.github.com/users/bugzpodder/following{/other_user}","gists_url":"https://api.github.com/users/bugzpodder/gists{/gist_id}","starred_url":"https://api.github.com/users/bugzpodder/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/bugzpodder/subscriptions","organizations_url":"https://api.github.com/users/bugzpodder/orgs","repos_url":"https://api.github.com/users/bugzpodder/repos","events_url":"https://api.github.com/users/bugzpodder/events{/privacy}","received_events_url":"https://api.github.com/users/bugzpodder/received_events","type":"User","site_admin":false},"created_at":"2018-12-10T07:53:02Z","updated_at":"2018-12-10T07:53:02Z","author_association":"COLLABORATOR","body":"Also, flow itself has tons of issues with invalid library definitions and even react definitions itself:\r\nhttps://github.com/facebook/flow/issues/7219\r\nThis for example will prevent anyone from adopting React.lazy syntax with flow enabled.  The only way to disable it to add $FlowFixMe before every React.lazy call..."}}
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