redux-recompose

Redux-recompose

Why another Redux library ?

redux-recompose provide tools to write less reducers/actions code.

Here is a blog post about it.

Usually, we are used to write:

// actions.js

function increment(anAmount) {
  return { type: 'INCREMENT', payload: anAmount };
}

// reducer.js

function reducer(state = initialState, action) {
  switch(action.type) {
    case 'INCREMENT':
      return { ...state, counter: state.counter + action.payload };
    default:
      return state;
  }
}

With the new concept of target of an action, we could write something like:

// actions.js

// Define an action. It will place the result on state.counter
function increment(anAmount) {
  return { type: 'INCREMENT', target: 'counter', payload: anAmount };
}


// reducer.js
// Create a new effect decoupled from the state structure at all.
const onAdd = (state, action) => ({ ...state, [action.target]: state[action.target] + action.payload });

// Describe your reducer - without the switch
const reducerDescription = {
  'INCREMENT': onAdd()
}

// Create it !
const reducer = createReducer(initialState, reducerDescription);

Effects

Effects are functions that describe how the state changes, but are agnostic of what part of the state is being changed.

redux-recompose provides some effects to ease reducer definitions. These are:

• onDelete
• onDeleteByIndex
• onFailure
• onLoaded
• onLoading
• onReadValue
• onSetValue
• onSuccess
• onAppend
• onConcatenate
• onToggle
• onSpreadValue
• onCycle
• onReplace
• onRetry
• onCancel

New effects are welcome ! Feel free to open an issue or even a PR.

Creators

There are a few creators that also ease writing Redux reducers and async actions.

• createReducer
• createTypes
• createThunkAction

Since state handling is decoupled from its state, we could create some more complex async actions, or even map an effect with an action type to create families of actions.
More crazy and useful ideas are welcome too!

Completers

You could use completers to reduce your code size. Completers are functions that take partial definitions (i.e. descriptors) and help to construct the whole definition.

Completers in general looks like this:

• A pattern is being repeated in an element.
• Identify that pattern and try to apply to every element similar to those who use this pattern, although they apply it or not.
• Add some exceptions for elements who don't use this pattern.
• Compress your code size by applying that pattern to all elements but not for exception cases.

There are a few completers that can be used:

• completeState
• completeReducer
• completeTypes

Injectors

There's currently documentation for the following:

• withFailure
• withFlowDetermination
• withPostFailure
• withPostFetch
• withPostSuccess
• withPreFetch
• withStatusHandling
• withSuccess

Middlewares

Middlewares allow to inject logic between dispatching the action and the actual desired change in the store. Middlewares are particularly helpful when handling asynchronous actions.

The following are currently available:

• fetchMiddleware

Using with immutable libraries

The way redux-recompose updates the redux state can be configured. The default configuration is

(state, newContent) => ({ ...state, ...newContent })

You can use configureMergeState to override the way redux-recompose handles state merging. This is specially useful when you are using immutable libraries. For example, if you are using seamless-immutable to keep your store immutable, you'll want to use it's merge function. You can do so with the following configuration:

import { configureMergeState } from 'redux-recompose';

configureMergeState((state, newContent) => state.merge(newContent))

Recipes

• Invisible Reducer
• Polling

Thanks to

This library was inspired by acdlite/recompose. Let's keep creating tools for ease development.

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

About

This project is maintained by Manuel Battan and it was written by Wolox.

License

redux-recompose is available under the MIT license.

Copyright (c) 2017 Manuel Battan <[e-mail]>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.