Sync ReactNativeTypes from React Native (#21015)

Author: yungsters

packages/react-native-renderer/src/ReactFabric.js

@@ -97,6 +97,7 @@ function findHostInstance_DEPRECATED<TElementType: ElementType>(
     // Fabric
     return (hostInstance: any).canonical;
   }
+  // $FlowFixMe[incompatible-return]
   return hostInstance;
 }
 

packages/react-native-renderer/src/ReactFabricHostConfig.js

@@ -187,7 +187,7 @@ class ReactFabricHostComponent {
 }
 
 // eslint-disable-next-line no-unused-expressions
-(ReactFabricHostComponent.prototype: NativeMethods);
+(ReactFabricHostComponent.prototype: $ReadOnly<{...NativeMethods, ...}>);
 
 export * from 'react-reconciler/src/ReactFiberHostConfigWithNoMutation';
 export * from 'react-reconciler/src/ReactFiberHostConfigWithNoHydration';

packages/react-native-renderer/src/ReactNativeFiberHostComponent.js

@@ -127,6 +127,6 @@ class ReactNativeFiberHostComponent {
 }
 
 // eslint-disable-next-line no-unused-expressions
-(ReactNativeFiberHostComponent.prototype: NativeMethods);
+(ReactNativeFiberHostComponent.prototype: $ReadOnly<{...NativeMethods, ...}>);
 
 export default ReactNativeFiberHostComponent;

packages/react-native-renderer/src/ReactNativeRenderer.js

@@ -96,6 +96,7 @@ function findHostInstance_DEPRECATED(
     // Fabric
     return (hostInstance: any).canonical;
   }
+  // $FlowFixMe[incompatible-return]
   return hostInstance;
 }
 

packages/react-native-renderer/src/ReactNativeTypes.js

@@ -94,7 +94,7 @@ export type PartialViewConfig = $ReadOnly<{
   validAttributes?: PartialAttributeConfiguration,
 }>;
 
-export type NativeMethods = {
+export type NativeMethods = $ReadOnly<{|
   blur(): void,
   focus(): void,
   measure(callback: MeasureOnSuccessCallback): void,
@@ -105,8 +105,7 @@ export type NativeMethods = {
     onFail?: () => void,
   ): void,
   setNativeProps(nativeProps: {...}): void,
-  ...
-};
+|}>;
 
 export type HostComponent<T> = AbstractComponent<T, $ReadOnly<NativeMethods>>;