[react-ui] Remove event object warnings (#16822)

Author: trueadm

packages/react-dom/src/events/DOMEventResponderSystem.js

@@ -303,16 +303,6 @@ function validateEventValue(eventValue: any): void {
         );
       }
     };
-    eventValue.preventDefault = () => {
-      if (__DEV__) {
-        showWarning('preventDefault()');
-      }
-    };
-    eventValue.stopPropagation = () => {
-      if (__DEV__) {
-        showWarning('stopPropagation()');
-      }
-    };
     eventValue.isDefaultPrevented = () => {
       if (__DEV__) {
         showWarning('isDefaultPrevented()');

packages/react-dom/src/events/__tests__/DOMEventResponderSystem-test.internal.js

@@ -837,30 +837,6 @@ describe('DOMEventResponderSystem', () => {
         </button>
       );
     };
-    expect(() => {
-      handler = event => {
-        event.preventDefault();
-      };
-      ReactDOM.render(<Test />, container);
-      dispatchClickEvent(buttonRef.current);
-    }).toWarnDev(
-      'Warning: preventDefault() is not available on event objects created from event responder modules ' +
-        '(React Flare).' +
-        ' Try wrapping in a conditional, i.e. `if (event.type !== "press") { event.preventDefault() }`',
-      {withoutStack: true},
-    );
-    expect(() => {
-      handler = event => {
-        event.stopPropagation();
-      };
-      ReactDOM.render(<Test />, container);
-      dispatchClickEvent(buttonRef.current);
-    }).toWarnDev(
-      'Warning: stopPropagation() is not available on event objects created from event responder modules ' +
-        '(React Flare).' +
-        ' Try wrapping in a conditional, i.e. `if (event.type !== "press") { event.stopPropagation() }`',
-      {withoutStack: true},
-    );
     expect(() => {
       handler = event => {
         event.isDefaultPrevented();