type-to-reducer-addons

Describe easily your redux reducer, working in couple with type-to-reducer. type-to-reducer-addons, like type-to-reducer, works well following API suggested by redux-promise-middleware.

Usage

npm install type-to-reducer type-to-reducer-addons --save

A usage of type-to-reducer like that:

import typeToReducer from 'type-to-reducer'

const initialState = {
  user: {
    data: null,
    fetching: false,
    fetched: false,
    error: false
  }
}

export const reducer = typeToReducer({
  [ USER_FETCH ]: {
    PENDING: () => ({
      ...initialState,
      fetching: true
    }),
    REJECTED: (state, action) => ({
      ...initialState,
      fetching: false,
      error: action.payload
    }),
    FULFILLED: (state, action) => ({
      ...initialState,
      fetching: false,
      fetched: true,
      data: action.payload
    })
  }
}, initialState)

can be easily compacted writing something like that:

import typeToReducer from 'type-to-reducer'
import typedReducer from 'type-to-reducer-addons'

const initialState = {
  user: {
    data: null,
    fetching: false,
    fetched: false,
    error: false
  }
}

const reducer = typeToReducer({
  [ USER_FETCH ]: typedReducer('user')
}, initialState)

So you have only to specify the name of the property target of the function (in this case user).

Splitting

When you have to customize one of pending, rejected or fulfilled function, you can split typedReducer:

import typeToReducer from 'type-to-reducer'
import { pendingAction, rejectedAction, fulfilledAction } from 'type-to-reducer-addons'

const initialState = {
  user: {
    data: null,
    fetching: false,
    fetched: false,
    error: false
  }
}

const reducer = typeToReducer({
  [ USER_FETCH ]: {
    PENDING: (state, action) => pendingAction(state, action, 'user'),
    REJECTED: (state, action) => rejectedAction(state, action, 'user'),
    FULFILLED: (state, action) => {
      const { age, name, surname } = action.payload
      
      return {
        ...initialState,
        fetching: false,
        fetched: true,
        data: {
          name,
          surname,
          age
        }
      }
    }
  }
}, initialState)

Custom shape

If your initial state object shape is different than the raccomanded by redux-promise-middleware, we exposed a function to call to customize your object shape.

import typeToReducer from 'type-to-reducer'
import typedReducer, { setCustomShape } from 'type-to-reducer-addons'

 const initialeState = {
    user: {
      payload: null,
      isFetching: false,
      isFetched: false,
      errors: null,
    },
  };

  const customShape = {
      data: "payload",
      fetching: "isFetching",
      fetched: "isFetched",
      error: "errors",
  };

setCustomShape(customShape);
  
const reducer = typeToReducer({
  [ USER_FETCH ]: typedReducer('user')
}, initialState)