@duckness/duck

Modular Redux Ducks hatchery.

Example

// counterDuck.js
import Duck from '@duckness/duck'

// Create duck with the name 'counter' for 'counter-app'
const counterDuck = Duck('counter', 'counter-app')

// Export action creators
counterDuck.action('incrementCounter', 'INCREMENT')
//  counterDuck.action.incrementCounter will build actions with type 'counter-app/counter/INCREMENT'
counterDuck.action('decrementCounter', 'DECREMENT')
//  counterDuck.action.decrementCounter will build actions with type 'counter-app/counter/DECREMENT'

// Add selector
counterDuck.selector('counter', state => (state.counter || 0))

// Add reducers
counterDuck.reducer('INCREMENT', (state, _action, duckFace) => {
  // duckness adds duckFace to every reducer
  // duckFace is an interface to duck with access to selectors, action types and root reducer
  return {
    ...state,
    counter: duckFace.select.counter(state) + 1
  }
})
counterDuck.reducer('DECREMENT', (state, _action, duckFace) => {
  return {
    ...state,
    counter: duckFace.select.counter(state) - 1
  }
})

// Duck itself is a root reducer
export default counterDuck

Table of Contents

• Example
• API
  • Create Duck
    • .duckName
    • .poolName
  • Actions
    • .mapActionType(actionType)
    • .action(actionName, actionType, payloadBuilder?, actionTransformer?)
    • .action[]
    • .listActionTypes()
    • .actionTypes[]
  • Selectors
    • .selector(selectorName, selector)
    • .select[]
  • Reducers
    • .reducer(actionType, reducer)
    • .reducer(null, reducer)
    • .reducer(withActions(action, duckFace), reducer)
  • Root reducer
  • duckFace
    • duckFace.actionTypes[]
    • duckFace.action[]
    • duckFace.mapActionType(actionType)
    • duckFace.listActionTypes()
    • duckFace.select[]
    • duckFace.reduce(state, action)
    • duck.duckFace
  • Context
    • Create Duck with context
    • duck.updateContext
  • Clone duck
• @Duckness packages:

API

Create Duck

Create a new duck with duckName and poolName (poolName is a namespace for ducks)

import Duck from '@duckness/duck'

const myDuck = Duck('duck-name', 'pool-name')

.duckName

const myDuck = Duck('duck-name', 'pool-name')
myDuck.duckName
// => 'duck-name'

.poolName

const myDuck = Duck('duck-name', 'pool-name')
myDuck.poolName
// => 'pool-name'

Actions

.mapActionType(actionType)

Maps short action type to long action type

myDuck.mapActionType('ACTION_TYPE')
// => 'pool-name/duck-name/ACTION_TYPE'

.action(actionName, actionType, payloadBuilder?, actionTransformer?)

Build action creator and register it under actionName (if actionName present)

const eatFish = myDuck.action('eatAllTheFish', 'EAT_FISH')
eatFish({ amount: 10 })
// => { type: 'pool-name/duck-name/EAT_FISH', payload: { amount: 10 } }
myDuck.action.eatAllTheFish({ amount: 9000 })
// => { type: 'pool-name/duck-name/EAT_FISH', payload: { amount: 9000 } }

Optional payloadBuilder could be specified to customize payloads

const eatFish = myDuck.action(null, 'EAT_FISH', payload => {
  return { amount: payload }
})
eatFish(10)
// => { type: 'pool-name/duck-name/EAT_FISH', payload: { amount: 10 } }

Optional actionTransformer could be specified to customize action

const eatFish = myDuck.action(null, 'EAT_FISH', null, action => {
  return { ...action, wellFed: true }
})
eatFish({ amount: 10 })
// => { type: 'pool-name/duck-name/EAT_FISH', payload: { amount: 10 }, wellFed: true }

If Error object is passed to action creator payloadBuilder will be skipped and action.error will be true

const eatFish = myDuck.action(null, 'EAT_FISH')
eatFish(new Error('no more fish'))
// => { type: 'pool-name/duck-name/EAT_FISH', payload: Error('no more fish'), error: true }

.action[]

Calls registered action creator by its name

const eatFish = myDuck.action('eatAllTheFish', 'EAT_FISH')
myDuck.action.eatAllTheFish({ amount: 9000 })
// => { type: 'pool-name/duck-name/EAT_FISH', payload: { amount: 9000 } }

.listActionTypes()

Returns all known short action types. Type is known if .mapActionType or .action was called with it.

myDuck.listActionTypes()
// => ['EAT_FISH', 'QUACK']

.actionTypes[]

Is an object that maps known short action types to long action types

myDuck.actionTypes.EAT_FISH
// => 'pool-name/duck-name/EAT_FISH'

Selectors

.selector(selectorName, selector)

Registers selector under selectorName

myDuck.selector('counter', (state, _duckFace) => (state.counter || 0))

.select[]

Calls registered selector

const state = { counter: 10 }
myDuck.select.counter(state)
// => 10

Reducers

.reducer(actionType, reducer)

Registers reducer for specific action type

myDuck.reducer('EAT_FISH', (state, action, _duckFace) => {
  return {
    ...state,
    fishEaten: state.fishEaten + action.payload.amount
  }
})

.reducer(null, reducer)

Registers wildcard reducer for all duck action types (ones that starts with 'pool-name/duck-name/')

myDuck.reducer(null, (state, action, _duckFace) => {
  return {
    ...state,
    updated: (state.updated || 0) + 1
  }
})

.reducer(withActions(action, duckFace), reducer)

Registers reducer with action filter

myDuck.reducer((action, _duckFace) => action.error, (state, action, _duckFace) => {
  return {
    ...state,
    errors: (state.errors || 0) + 1
  }
})

Root reducer

Duck itself is a root reducer for all registered reducers

myDuck( state, duckAction(payload) )
// => reduced state

duckFace

duckFace is an interface to duck that is added as a last argument to each registered selectors and reducers

myDuck.selector('counter', (some, selector, args, duckFace) => {
  // ...
}
myDuck.reducer('EAT_FISH', (state, action, duckFace) => {
  // ...
}

duckFace.actionTypes[]

Is an object that maps known short action types to long action types

duckFace.actionTypes.EAT_FISH
// => 'pool-name/duck-name/EAT_FISH'

duckFace.action[]

Calls registered action creator by its name

dispatch(duckFace.action.eatFish())

duckFace.mapActionType(actionType)

Maps short action type to long action type

duckFace.mapActionType('ACTION_TYPE')
// => 'pool-name/duck-name/ACTION_TYPE'

duckFace.listActionTypes()

Returns all known short action types. Type is known if .mapActionType or .action was called with it.

duckFace.listActionTypes()
// => ['EAT_FISH', 'QUACK']

duckFace.select[]

Calls registered selector

const state = { counter: 10 }
duckFace.select.counter(state)
// => 10

duckFace.reduce(state, action)

Calls duck root reducer

const prepareFish = myDuck.action(null, 'PREPARE_FISH')
myDuck.reducer('EAT_FISH', (state, action, duckFace) => {
  const preparedState = duckFace.reduce(state, prepareFish())
  return {
    ...preparedState,
    // ...
  }
})

duck.duckFace

duckFace can also be accessed from the duck itself by duck.duckFace name.

Context

Create Duck with context

Duck can be created with duckContext that will be accessible for selectors and reducers through duckFace

const themeDuck = Duck('theme', 'my-app', { highlightColor: 'blue' })
themeDuck.duckFace.duckContext.highlightColor
// => 'blue'

duck.updateContext

Duck context can be replaced with duck.updateContext(newContext)

themeDuck.updateContext({ highlightColor: 'red' })

Clone duck

Duck can be cloned by calling .clone(duckName, moduleName, duckContext).

Cloned duck will contain selectors, reducers and known action types copied from original duck with all action types adjusted to duckName and moduleName.

duckContext will be replaced.

Cloned duck can be expanded further.

const baseDuck = Duck('base', 'my-app')
baseDuck.reducer('BASE_ACTION', /* ... */)

const extendedDuck = baseDuck.clone('extended', 'my-app')
extendedDuck.reducer('ANOTHER_ACTION', /* ... */)

@Duckness packages:

• @duckness/duck - Modular Redux Ducks hatchery
• @duckness/saga - Redux Saga extension for @duckness/duck
• @duckness/epic - Redux-Observable extension for @duckness/duck
• @duckness/pool - @duckness/duck + Redux
• @duckness/pool-saga-stream - @duckness/saga plugin for @duckness/pool
• @duckness/pool-epic-stream - @duckness/epic plugin for @duckness/pool
• @duckness/react-redux-pool - @duckness/pool + React-Redux
• @duckness/use-redux - React hook for Redux store
• @duckness/use-pool - React hook for @duckness/pool.
• @duckness/store - simple store for React components
• @duckness/reactor - reactive data flow builder