react server side rendering without redux (server side)

renderRoute.js

// Helper function: Loop through all components in the renderProps object // and returns a new object with the desired key
let getPropsFromRoute = (renderProps, componentProps) => {
    let props = {};
    let lastRoute = renderProps.routes[-1];
    renderProps.routes.reduceRight((prevRoute, currRoute) => {
        componentProps.forEach(componentProp => {
            if (!props[componentProp] && currRoute.component[componentProp]) {
                props[componentProp] = currRoute.component[componentProp];
            }
        });
    }, lastRoute);
    return props;
};

let renderRoute = (response, renderProps) => {
    // Loop through renderProps object looking for 'requestInitialData'
    let routeProps = getPropsFromRoute(renderProps, ['requestInitialData']);
    if (routeProps.requestInitialData) {
        // If one of the components implements 'requestInitialData', invoke it.
        routeProps
            .requestInitialData()
            .then((data)=>{
                // Ovewrite the react-router create element function
                // and pass the pre-fetched data as initialData props
                let handleCreateElement = (Component, props) =>(
                    <Component initialData={data} {...props} />
                );
                // Render the template with RoutingContext and loaded data.
                response.render('index', {
                    reactInitialData: JSON.stringify(data),
                    content: renderToString(
                        <RouterContext createElement={handleCreateElement} {...renderProps} />
                    )
                });
            });
    } else {
        // No components in this route implements 'requestInitialData'.
        // Simply render the template with RoutingContext and no initialData.
        response.render('index', {
            reactInitialData: null,
            content: renderToString(<RouterContext {...renderProps} />)
        });
    }
};

export default renderRoute;