helpers.js

const supportsHistory = () => {
  const ua = navigator.userAgent;

    // We only want Android 2 and 4.0, stock browser, and not Chrome which identifies
    // itself as 'Mobile Safari' as well, nor Windows Phone (issue #1471).
    if ((ua.indexOf('Android 2.') !== -1 ||
        (ua.indexOf('Android 4.0') !== -1)) &&
        ua.indexOf('Mobile Safari') !== -1 &&
        ua.indexOf('Chrome') === -1 &&
        ua.indexOf('Windows Phone') === -1) {
      return false;
    }

    // Return the regular check
    return (window.history && 'pushState' in window.history);
}

export {
  supportsHistory
};

historyDriver.js

import {Rx} from '@cycle/core';
import {createHistory, createHashHistory, useQueries} from 'history';
import helpers from './helpers';

const  makeHistory = (hash, useQueries, options) => {
  hash = hash || helpers.supportsHistory();
  if (hash && useQueries) return useQueries(createHashHistory)(options);
  if (hash && !useQueries) return createHashHistory(options);
  if (!hash && useQueries) return useQueries(createHistory)(options);
  if (!hash && !useQueries) return createHistory(options);
}

const createPushState = (history) => {

  return const pushState = (path) => {
    if ('string' === typeof url) history.pushState({}, url);
    // Is an object with state and path;
    else if ('object' === typeof url) {
      let {state, path} = url;
      history.pushState(state, path)
    } else {
      throw new Error("History Driver input must be a string or object { state: { the: 'state' }, path : '/path' }");
    }
  }

}

const createHistorySubject = (history) => {
  let subject = new Rx.BehaviorSubject();

  // Append methods for convenience.
  // To be removed if unneeded.
  Object.keys(history).forEach(key => {
    if (key !== 'listen') subject[key] = history[key];
  })
  // More descriptive
  subject.location = subject.value;

  return subject;
}

const  makeHistoryDriver = ( { hash = false, useQueries = true, ...options } ) => {

  const history = makeHistory(hash, useQueries, options);
  const historySubject = createHistorySubject(history);

  return const  historyDriver = (url$) => {

      url$
        .subscribe(createPushState(history));

      history.listen(location => historySubject.onNext(location));

      return historySubject;
      
  }
}

hey, could you provide example of usage of this driver? I see Subject is returned and it worries me a bit :)