redux-overlord

Give an overlord reducer access to the entire combineReducer state

Why

Although sharing the state of reducers is generally considered an anti pattern, there are cases where it's neeccessary. For myself, I wanted the ability to batch complex actions together, and one of those actions was a generic reordering action. I separate my relationship reducers from their respective entities to take advantage of handling a single action with multiple reducers, but the problem with the reordering action is that it relies on information in the entities themselves. Now under normal circumstances, I would get the state, get all the information I need, and then send the reorder action with the correct order already calculated. Since I'm batching actions, however, and my reorder action depends on the preceding actions, I need the ability to calculate and change the reordered relationship directly inside an overlord reducer.

npm install --save redux-overlord

Usage

import {createStore, combineReducers} from 'redux';
import shadowReducer from 'redux-overlord';

function one(state, action){
    switch(action.type){
        default:
            return 1
    }
}

function two(state, action){
    switch(action.type){
        default:
            return 2
    }
}

const overlordReducer = function(state, action){
    switch(action.type)
        default:
            return {one: state.one, two: state.two + 1}
}

const shadowedReducer = shadowReducer(
    combineReducers({one, two}),
    overlordReducer
)



const store = createStore(shadowedReducer, initialState)