create-reducer-actions
v1.0.2
Published
Create your next immutable state by mutating the current one
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createReducerActions
createReducerActions
is a single function that creates a redux reducer and linked action creators.
You don't need to define action types or actions, and you don't need to write tedious switch/case statements in your reducers.
createReducerActions
works like this:
const initialState = 0;
const { reducer, actions } = createReducerActions(
{
up: state => state + 1,
down: state => state - 1
},
initialState
);
actions.up(); // { type: "up" }
reducer(); // 0 === initialState
reducer(7, up()); // 8
Getting Started
Installation
$ npm install --save create-reducer-actions
// or
$ yarn add create-reducer-actions
Usage with React
// redux/counter.js
import createReducerActions from "create-reducer-actions";
const initialState = 0;
export const { reducer, actions } = createReducerActions(
{
increment: state => state + 1,
decrement: state => state - 1,
add: (state, { payload }) => state + payload,
sub: (state, { payload }) => state - payload
},
initialState
);
// store.js
import { createStore, combineReducers } from "redux";
import { reducer as counter } from "./redux/counter";
const rootReducer = combineReducers({ counter });
const store = createStore(rootReducer);
export default store;
// Counter.js
import React from "react";
import { connect } from "react-redux";
import { actions } from "./redux/counter";
export const Counter = ({ counter, add, sub, increment, decrement }) => {
return (
<div>
<h1>Counter: {counter}</h1>
<button onClick={increment}>increment</button>
<button onClick={decrement}>decrement</button>
<button onClick={() => add(5)}>add 5</button>
<button onClick={() => sub(5)}>subtract 5</button>
</div>
);
};
const mapStateToProps = state => {
return { counter: state.counter };
};
const mapDispatchToProps = actions; // automatically includes all exported actions
export default connect(mapStateToProps, mapDispatchToProps)(Counter);
Options
actionPrefix
In a large application action names can conflict with each other. Prefix actions with {appName}/{reducerName}/
to avoid conflicts:
const { reducer, actions } = createReducerActions(
{
like: state => state + 1,
unlike: state => state - 1
},
0,
{ actionPrefix: "FACEBOOK/LIKE_REDUCER/" }
);
actions.like()
will now dispatch an action with type FACEBOOK/LIKE_REDUCER/like
.
mutable
Redux requires immutable changes to state.
Immutable changes in deeply nested objects are difficult to do, so add mutable: true
to the createReducerActions
options and you can make mutable changes to state that will be automatically turned into immutable changes:
const initialState = {
photos: { large: { url: "" } }
};
const { reducer, actions } = createReducerActions(
{
setLargePhotoUrl: (state, { payload: { url } }) => {
// mutate the state!
state.photos.large.url = url;
// don't return anything
}
},
initialState,
{ mutable: true }
);
const url = "https://i.imgur.com/4LR3f32.jpg";
const newState = reducer(initialState, actions.setLargePhotoUrl({ url }));
newState.photos.large.url; // "https://i.imgur.com/4LR3f32.jpg"
initialState.photos.large.url; // "" The initial state wasn't mutated =O
These mutating changes are done with the immutable helper library immer.
Similar Projects
- https://github.com/kolodny/redux-create-reducer
- https://github.com/nrn/create-reducer
- https://github.com/pauldijou/redux-act
- https://github.com/infinitered/reduxsauce
- https://javascript.tutorialhorizon.com/2016/07/23/create-reducer-for-redux-applications/
- https://github.com/redux-utilities/redux-actions
- https://github.com/anish000kumar/redux-box