Flow errors on 0.50.3

[joemckie]

Is this a bug report?

Yes. Although this may not be RN specific -- it's more of a problem with flow in RN.

Have you read the Contributing Guidelines?

Yes

Environment

Environment:
OS: macOS High Sierra 10.13.1
Node: 9.2.0
Yarn: 1.2.1
npm: 5.5.1
Watchman: 4.9.0
Xcode: Xcode 9.1 Build version 9B55
Android Studio: Not Found

Packages: (wanted => installed)
react: 16.0.0 => 16.0.0
react-native: 0.50.3 => 0.50.3
flow-bin: 0.56.0 => 0.56.0

Target Platform: iOS (10.3)

Steps to Reproduce

Run flow in a RN project

Expected Behavior

Should pass flow checks.

Actual Behavior

Flow errors are being reported from both the metro-bundler package and react-native.

Full list of errors can be found here.

They seem to all be Promise related, but I can't quite work out why. This has only been an issue since upgrading RN@0.50.3.

Reproducible Demo

n/a, not a visual bug.

[ollyde]

How can they push a release candidate and not even flow check it.

[otusweb]

./node_modules/.bin/flow version
Flow, a static type checker for JavaScript, version 0.64.0
./node_modules/.bin/react-native --version
Scanning folders for symlinks in /Users/otusweb/Projects/reactnative/node_modules (13ms)
0.52.1
my flow.config is a copy of https://github.com/facebook/react-native/blob/master/local-cli/templates/HelloWorld/_flowconfig at SHA 298f3bb

Flow returned 24 errors.

[react-native-bot]

Thanks for posting this! It looks like you may not be using the latest version of React Native, v0.53.0, released on January 2018. Can you make sure this issue can still be reproduced in the latest version?

I am going to close this, but please feel free to open a new issue if you are able to confirm that this is still a problem in v0.53.0 or newer.

_{How to Contribute • What to Expect from Maintainers}