react router v4 middleware

middleware.js

import { push, replace } from 'connected-react-router';

export default store => next => action => {
    if (action.pushToUrl) {
        const state = store.getState();

        const currentQueries = new URLSearchParams(state.router.location.search);
        Object.entries(action.pushToUrl).forEach(([key, value]) => {
            currentQueries.set(key, value);
        });

        const queriesAsString = currentQueries.toString();

        store.dispatch(push(
            `${state.router.location.pathname}?${queriesAsString}`,
        ));
    }

    if (action.updateUrl) {
        store.dispatch(push(action.updateUrl));
    }

    if (action.replaceUrl) {
        store.dispatch(replace(action.replaceUrl));
    }

    return next(action);
};