Class RCTCxxModule was not exported. Did you forget to use RCT_EXPORT_MODULE()?

There are warnings on app start:

2018-03-05 21:10:33.505 [warn][tid:main][RCTBridge.m:120] Class RCTCxxModule was not exported. Did you forget to use RCT_EXPORT_MODULE()?
2018-03-05 21:10:33.505169+0700 AwesomeProject[23617:4551316] Class RCTCxxModule was not exported. Did you forget to use RCT_EXPORT_MODULE()?

Environment

Environment:
  OS: macOS High Sierra 10.13.3
  Node: 9.7.1
  Yarn: 1.5.1
  npm: 5.6.0
  Watchman: 4.9.0
  Xcode: Xcode 9.2 Build version 9C40b
  Android Studio: 3.0 AI-171.4443003

Packages: (wanted => installed)
  react: ^16.3.0-alpha.1 => 16.3.0-alpha.1
  react-native: 0.54.0 => 0.54.0

Expected Behavior

No warnings.

Actual Behavior

There are warnings.

Steps to Reproduce

1. react-native init AwesomeProject
2. Open ios/AwesomeProject.xcodeproj
3. Run the app and look at the output.
4. There will be warnings among first several lines.

I’ve tested several versions back (0.49) and the issue is there as well.

Sample project

https://github.com/vshab/react-native-0.54-run-warning

[codemers]

@frayhan32 For now it’s not the best solution, but to avoid the warning we can ignore it:

import { YellowBox } from 'react-native'; YellowBox.ignoreWarnings(['Class RCTCxxModule']);

[jmeyers91]

Also seeing this with react-native 0.55.3.