StyleSheet.create "not covered by flow"

Question

I am using flow 0.42.0 in a react native project with nuclide. With the default project, I get the following message: Along with the following errors: ``` > flow check index.ios.js:40 40: ^^^^^^^^^ property `container`. Property cannot be accessed on possibly undefined value 40: ^^^^^ undefined index.ios.js:40 40: ^^^^^^^^^ property `container`. Property not found in 40: ^^^^^ Array index.ios.js:41 41: ^^^^^^^ property `welcome`. Property cannot be accessed on possibly undefined value 41: ^^^^^ undefined index.ios.js:41 41: ^^^^^^^ property `welcome`. Property not found in 41: ^^^^^ Array index.ios.js:44 44: ^^^^^^^^^^^^ property `instructions`. Property cannot be accessed on possibly undefined value 44:

Accepted Answer

The warning is because of the third party has not integrated flow to their end. In our case, the StyleSheet is giving the warning so react native is the third party who has not integrated flow. React native only included flow in some components only may be core ones and it was officially declared by them.

As told by you that react-native is using flow in stylesheet so i came to a conclusion:

```
import type { StyleObj } from 'react-
native/Libraries/StyleSheet/StyleSheetTypes';

type Props = {
    style?: StyleObj,
};
```

The other way is to upgrade the flow.

Cheers :)

StyleSheet.create "not covered by flow"

Solution

Problem