Redux Rungen

Generator middleware for Redux (Based on rungen)

Another redux-saga ?

I like redux-saga a lot, It's quite powerfull and if you already use it and feel quite happy about it, than just continue. This is just a pale copy of it :).

But if like me,

• You find that the generator approach is a breeze,
• You like how easy testing those generators is.

And in the same time you find the redux-saga approach a little bit harder to reason about in comparison to thunks, than I made this library for you (for me at first :P)

So, how does this work ?

The principle here is simple. Instead of writing your action creators using thunks, you just replace them (one to one) by generators.

Example :

Take the following thunk action creator

function requestPost(id) {
  return dispatch => {
    dispatch({ type: 'post-fetch', payload: id })
    fetch('/api/post/' + id)
      .then(post => {
        dispatch({ type: 'post-fetch-success', payload: post })
      })
      .catch(error => {
        dispatch({ type: 'post-fetch-error', payload: error })
      })
  }
}

The equivalent using redux-rungen is

import {put} from 'redux-rungen'
import {call} from 'rungen'
 
function* requestPost(id) {
  yield put({ type: 'post-fetch', payload: id })
  try {
    const post = yield call(fetch, '/api/post/' + id)
    yield put({ type: 'post-fetch-success', payload: post })
  } catch (error) {
    yield put({ type: 'post-fetch-error', payload: error })
  }
}

Why It's better ?

• Because testing effects based generators is refreshing : The generator itself never triggers the side effect (API call) it self. This means no mocking is required to test your action creators.
• Because I can compose my action creators easily and have a really nice way to express complex flows using fork/join effects.

Seems too complex ?

If you are not yet familiar with ES6 generators and runtimes like co or rungen, I understand. So if you are not interested in the ease of testing and are happy with what you're doing using thunks, you certainly don't want to use rungen :)