Is this a bug report?

Yes

Have you read the Bugs section of the Contributing to React Native Guide?

Yes

Environment

1. react-native -v: react-native-cli: 2.0.1 | react-native: 0.45.1

2. node -v: v6.9.2

3. npm -v: 3.10.9

4. yarn --version (if you use Yarn): 0.21.3

5. Target Platform (e.g. iOS, Android): iOS

6. Development Operating System (e.g. macOS Sierra, Windows 10): macOS Sierra

7. Build tools (Xcode or Android Studio version, iOS or Android SDK version, if relevant): Xcode

Steps to Reproduce

1. > react-native init TmpProject
2. > cd TmpProject
3. > yarn add -D flow-bin
4. edit .flowconfig to use flow-version >= 0.47
5. > ./node_modules/.bin/flow

node_modules/react-native/Libraries/Experimental/WindowedListView.js:493
493:           {this.props.renderWindowBoundaryIndicator(showIndicator)}
                                                         ^^^^^^^^^^^^^ unused function argument
   76:   renderWindowBoundaryIndicator?: () => ?React.Element<any>,
                                         ^^^^^^^^^^^^^^^^^^^^^^^^^ function type expects no arguments

... more errors like these...

Found 41 errors

Expected Behavior

No errors on a newly created project.

Actual Behavior

A lot of error on a newly created project.

Reproducible Demo

https://github.com/Jpunt/react-native-flow-bug

See this post on flow.org for more information about these kind of errors.