Fix native component event property checks

Author: OskarEichler

packages/react-native/Libraries/ReactNative/__tests__/getNativeComponentAttributes-test.js

@@ -10,11 +10,13 @@
 
 'use strict';
 
+let mockDefaultEventTypes: {[string]: unknown} = {};
+
 jest.mock('../UIManager', () => ({
   __esModule: true,
   default: {
     getConstants: () => ({ViewManagerNames: []}),
-    getDefaultEventTypes: () => ({}),
+    getDefaultEventTypes: () => mockDefaultEventTypes,
     getViewManagerConfig: name =>
       name === 'TestView'
         ? {
@@ -33,6 +35,10 @@ const getNativeComponentAttributes =
   require('../getNativeComponentAttributes').default;
 
 describe('getNativeComponentAttributes', () => {
+  beforeEach(() => {
+    mockDefaultEventTypes = {};
+  });
+
   it('processes object font variation settings from native view configs', () => {
     const viewConfig = getNativeComponentAttributes('TestView');
 
@@ -46,4 +52,13 @@ describe('getNativeComponentAttributes', () => {
       }),
     ).toBe("'opsz' 17.25, 'wght' 552.5");
   });
+
+  it('merges event types that shadow Object prototype properties', () => {
+    const hasOwnPropertyEvent = {registrationName: 'onHasOwnProperty'};
+    mockDefaultEventTypes = {hasOwnProperty: hasOwnPropertyEvent};
+
+    const viewConfig = getNativeComponentAttributes('TestView');
+
+    expect(viewConfig.hasOwnProperty).toBe(hasOwnPropertyEvent);
+  });
 });

packages/react-native/Libraries/ReactNative/getNativeComponentAttributes.js

@@ -134,6 +134,9 @@ function attachDefaultEventTypes(viewConfig: any) {
   }
 }
 
+// $FlowFixMe[method-unbinding]
+const hasOwnProperty = Object.prototype.hasOwnProperty;
+
 // TODO: Figure out how to avoid all this runtime initialization cost.
 function merge(destination: ?Object, source: ?Object): ?Object {
   if (!source) {
@@ -144,12 +147,12 @@ function merge(destination: ?Object, source: ?Object): ?Object {
   }
 
   for (const key in source) {
-    if (!source.hasOwnProperty(key)) {
+    if (!hasOwnProperty.call(source, key)) {
       continue;
     }
 
     let sourceValue = source[key];
-    if (destination.hasOwnProperty(key)) {
+    if (hasOwnProperty.call(destination, key)) {
       const destinationValue = destination[key];
       if (
         typeof sourceValue === 'object' &&