StyleSheet.flatten flow issues

[Esemesek]

🐛 Bug Report

StyleSheet.flatten return types which are incompatible with NativeComponents.
I am using [email protected], which is the same as [email protected]

Cannot create View element because inexact ____DangerouslyImpreciseStyle_Internal [1] is incompatible with exact
$ReadOnly [2] in property style.

     App.js
      21│ export default class App extends Component<Props> {
      22│   render() {
      23│     return (
      24│       <View style={StyleSheet.flatten(styles.container)}>
      25│         <Text style={styles.welcome}>Welcome to React Native!</Text>
      26│         <Text style={styles.instructions}>To get started, edit App.js</Text>
      27│         <Text style={styles.instructions}>{instructions}</Text>
      28│       </View>
      29│     );
      30│   }
      31│ }

     node_modules/react-native/Libraries/StyleSheet/StyleSheetTypes.js
 [2] 647│   $ReadOnly<$Shape<____ViewStyle_Internal>>,

     node_modules/react-native/Libraries/StyleSheet/flattenStyle.js
 [1]  19│ ): ?DangerouslyImpreciseStyle {

To Reproduce

1. Initialize new project
2. Apply this diff

diff --git a/App.js b/App.js
index bb48232..b9b5335 100644
--- a/App.js
+++ b/App.js
@@ -21,7 +21,7 @@ type Props = {};
 export default class App extends Component<Props> {
   render() {
     return (
-      <View style={styles.container}>
+      <View style={StyleSheet.flatten(styles.container)}>
         <Text style={styles.welcome}>Welcome to React Native!</Text>
         <Text style={styles.instructions}>To get started, edit App.js</Text>
         <Text style={styles.instructions}>{instructions}</Text>

3. Install [email protected]
4. Run compilation yarn flow

Expected Behavior

Flow compilation should be successful.

Code Example

https://github.com/Esemesek/RNFlowRepro

Environment

  React Native Environment Info:
    System:
      OS: macOS 10.14.2
      CPU: (4) x64 Intel(R) Core(TM) i5-7360U CPU @ 2.30GHz
      Memory: 101.36 MB / 8.00 GB
      Shell: 5.3 - /bin/zsh
    Binaries:
      Node: 11.6.0 - /usr/local/bin/node
      Yarn: 1.13.0 - /usr/local/bin/yarn
      npm: 6.5.0 - /usr/local/bin/npm
      Watchman: 4.9.0 - /usr/local/bin/watchman
    SDKs:
      iOS SDK:
        Platforms: iOS 12.1, macOS 10.14, tvOS 12.1, watchOS 5.1
      Android SDK:
        API Levels: 27, 28
        Build Tools: 27.0.3, 28.0.2, 28.0.3
        System Images: android-24 | Google Play Intel x86 Atom, android-27 | Google APIs Intel x86 Atom
    IDEs:
      Android Studio: 3.2 AI-181.5540.7.32.5056338
      Xcode: 10.1/10B61 - /usr/bin/xcodebuild
    npmPackages:
      react: 16.6.3 => 16.6.3
      react-native: 0.58.4 => 0.58.4

[cpojer]

@Esemesek could you send a pull request to fix this?

[satya164]

This seems to be correct behaviour. Closing.

[irohitb]

@satya164 can you at least explain why this error is coming?