Variable windowRef

windowRef: {
    addEventListener: (_name: string, eventCallback: Callback) => void;
    location: { origin: string };
    postMessage: (
        message: string | Record<string, unknown>,
        _target?: string,
    ) => void;
    removeEventListener: (_name: string, eventCallback: Callback) => void;
}

A mock for postmessage if run in node.js environment