{"patch":"diff --git a\/packages\/react-dom\/src\/events\/DOMEventResponderSystem.js b\/packages\/react-dom\/src\/events\/DOMEventResponderSystem.js\nindex 86f03cc62a..cd83864fbb 100644\n--- a\/packages\/react-dom\/src\/events\/DOMEventResponderSystem.js\n+++ b\/packages\/react-dom\/src\/events\/DOMEventResponderSystem.js\n@@ -109,20 +109,37 @@ const eventResponderContext: ReactResponderContext = {\n );\n }\n if (__DEV__) {\n- possibleEventObject.preventDefault = () => {\n- \/\/ Update this warning when we have a story around dealing with preventDefault\n+ const showWarning = name => {\n warning(\n false,\n- 'preventDefault() is no longer available on event objects created from event responder modules.',\n+ '%s is not available on event objects created from event responder modules (React Flare).',\n+ name,\n );\n };\n+ possibleEventObject.preventDefault = () => {\n+ showWarning('preventDefault()');\n+ };\n possibleEventObject.stopPropagation = () => {\n- \/\/ Update this warning when we have a story around dealing with stopPropgation\n- warning(\n- false,\n- 'stopPropagation() is no longer available on event objects created from event responder modules.',\n- );\n+ showWarning('stopPropagation()');\n+ };\n+ possibleEventObject.isDefaultPrevented = () => {\n+ showWarning('isDefaultPrevented()');\n+ };\n+ possibleEventObject.isPropagationStopped = () => {\n+ showWarning('isPropagationStopped()');\n };\n+ \/\/ $FlowFixMe: we don't need value, Flow thinks we do\n+ Object.defineProperty(possibleEventObject, 'nativeEvent', {\n+ get() {\n+ showWarning('nativeEvent');\n+ },\n+ });\n+ \/\/ $FlowFixMe: we don't need value, Flow thinks we do\n+ Object.defineProperty(possibleEventObject, 'defaultPrevented', {\n+ get() {\n+ showWarning('defaultPrevented');\n+ },\n+ });\n }\n const eventObject = ((possibleEventObject: any): $Shape<\n PartialEventObject,\ndiff --git a\/packages\/react-dom\/src\/events\/__tests__\/DOMEventResponderSystem-test.internal.js b\/packages\/react-dom\/src\/events\/__tests__\/DOMEventResponderSystem-test.internal.js\nindex dc5e8c58d2..bdcf893f20 100644\n--- a\/packages\/react-dom\/src\/events\/__tests__\/DOMEventResponderSystem-test.internal.js\n+++ b\/packages\/react-dom\/src\/events\/__tests__\/DOMEventResponderSystem-test.internal.js\n@@ -889,4 +889,98 @@ describe('DOMEventResponderSystem', () => {\n \n ReactDOM.render(, container);\n });\n+\n+ it('the event responder system should warn on accessing invalid properties', () => {\n+ const ClickEventComponent = createReactEventComponent(\n+ undefined,\n+ ['click'],\n+ undefined,\n+ undefined,\n+ undefined,\n+ (event, context, props) => {\n+ const syntheticEvent = {\n+ target: event.target,\n+ type: 'click',\n+ };\n+ context.dispatchEvent(syntheticEvent, props.onClick, {\n+ discrete: true,\n+ });\n+ },\n+ );\n+\n+ let handler;\n+ const Test = () => (\n+ \n+

dillon1000/react

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