Add a test for the issue discussed in #8787.

react-redux/react-redux-tests.tsx

@@ -284,3 +284,47 @@ function HelloMessage(props: HelloMessageProps) {
 let ConnectedHelloMessage = connect()(HelloMessage);
 ReactDOM.render(<HelloMessage name="Sebastian" />, document.getElementById('content'));
 ReactDOM.render(<ConnectedHelloMessage name="Sebastian" />, document.getElementById('content'));
+
+// https://github.com/DefinitelyTyped/DefinitelyTyped/issues/8787
+namespace TestTOwnPropsInference {
+    interface OwnProps {
+        own: string;
+    }
+
+    interface StateProps {
+        state: string;
+    }
+
+    class OwnPropsComponent extends React.Component<OwnProps & StateProps, {}> {
+        render() {
+            return null;
+        }
+    }
+
+    function mapStateToPropsWithoutOwnProps(state: any): StateProps {
+        return { state: 'string' };
+    }
+
+    function mapStateToPropsWithOwnProps(state: any, ownProps: OwnProps): StateProps {
+        return { state: 'string' };
+    }
+
+    const ConnectedWithoutOwnProps = connect(mapStateToPropsWithoutOwnProps)(OwnPropsComponent);
+    const ConnectedWithOwnProps = connect(mapStateToPropsWithOwnProps)(OwnPropsComponent);
+    const ConnectedWithTypeHint = connect<StateProps, {}, OwnProps>(mapStateToPropsWithoutOwnProps)(OwnPropsComponent);
+
+    // This compiles, which is bad.
+    React.createElement(ConnectedWithoutOwnProps, { anything: 'goes!' });
+
+    // This compiles, as expected.
+    React.createElement(ConnectedWithOwnProps, { own: 'string' });
+
+    // This should not compile, which is good.
+    // React.createElement(ConnectedWithOwnProps, { missingOwn: true });
+
+    // This compiles, as expected.
+    React.createElement(ConnectedWithTypeHint, { own: 'string' });
+
+    // This should not compile, which is good.
+    // React.createElement(ConnectedWithTypeHint, { missingOwn: true });
+}