• I have reviewed the documentation
• I have searched existing issues
• I am using the latest React Native version

Environment

Environment:
  OS: macOS High Sierra 10.13.4
  Node: 9.11.1
  Yarn: 1.7.0
  npm: 6.1.0
  Watchman: 4.9.0
  Xcode: Xcode 9.3.1 Build version 9E501
  Android Studio: 3.1 AI-173.4670197

Packages: (wanted => installed)
  react: 16.3.1 => 16.3.1
  react-native: ~0.55.2 => 0.55.4

Steps to Reproduce

https://snack.expo.io/r1wCcj5JQ

Expected Behavior

console: 42

Actual Behavior

console: undefined

I did some digging around, finding that the polyfilled Promise imported from fbjs is not implemented right:

https://github.com/facebook/fbjs/blob/v0.8.16/src/__forks__/Promise.native.js#L18-L23

There is already an issue about this years ago: facebook/fbjs#132

Another related issue: #17972