Epic get github user repos

epicGetUserRepos.js

import { ajax } from 'rxjs/observable/dom/ajax';
import 'rxjs/add/operator/catch'
import {
  REQUEST_USER_REPOS_START
} from '../actions/actionTypes';

import {
  doUserReposFulfilled,
  doUserReposFailed
} from '../actions/doUserRepos';


// epic
const epicGetUserRepos = action$ => {
  return action$.ofType(REQUEST_USER_REPOS_START)
    .mergeMap(action =>
      ajax.getJSON(`https://api.github.com/users/${action.username}/repos`)
      .map(response => doUserReposFulfilled(response))
      .catch(error => doUserReposFailed(error))
    );
}

export default epicGetUserRepos;