Summary:
Some babel plugins add additional methods to `Function.prototype` (see https://github.com/MatAtBread/fast-async):
```js
Function.prototype.$asyncbind = function $asyncbind(self, catcher) {
...
```
Although undocumented, React Native allows functions to be passed to `StyleSheet.create()` for dynamic styling:
```js
const styles = StyleSheet.create({
animalItem: height => ({ height })
});
```
If there are additional custom methods on `Function.prototype`, React Native's `StyleSheetValidation.validateStyle` will loop through these properties and raise an error because those properties are not valid style keys, because it loops through _all_ properties, including inherited ones.
This PR modifies `StyleSheetValidation.validateStyle` to only loop through the style's own properties, instead of including inherited ones.
## Changelog
[General] [Fixed] - Fix stylesheet validation for functions with custom prototype methods.
Pull Request resolved: https://github.com/facebook/react-native/pull/27264
Test Plan: - Tested that non-function style properties are still validated
Differential Revision: D18694895
Pulled By: hramos
fbshipit-source-id: b36f4a62a435e7b6a689398de3bcc06d6bb14293
Freeman Latif
f464dad5d4
