redux-dispatcher

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redux-dispatcher

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An all-in-one simple solution to manage actions with less code 🦄

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## redux-dispatcher is an all-in-one simple solution to manage actions with less code 🦄
**Its main purpose is to combine action type, action creator and dispatch function into one,
then you no need to worry about defining and managing action type constants.**

## Short example
```js
import { createDispatcher } from 'redux-dispatcher'

const key = "app"

const mapDispatch = {
    setUser: name => ({ name })
};

const appDispatcher = createDispatcher(key, mapDispatch)
```
```js
appDispatcher.setUser("Anonymous")  // dispatch action {type: "app/SET_USER", name: "Anonymous"}
```

**Guaranteed**:
- Intuitive
- Less code

**Suitable**:
- If you use Redux and want to reduce boilerplate
- If you find it tiresome every time you need to define, import, manage actions

**Advanced functionalities**:
- [Action with side effect](#user-content-retrieve-side-effect-result-after-dispatching-an-action-no-more-callback)
- [Thunk support](#user-content-define-thunk-like-your-favourite-redux-thunk)
- [Immutable helpers](#user-content-immutable-helper-for-state)

## Usage
### 1. Install and setup

```npm install redux-dispatcher --save```

**Setup**
```js
import {applyMiddleware, createStore} from "redux";
import {dispatcherMiddleware} from "redux-dispatcher";

const store = createStore(
    reducer,
    applyMiddleware(dispatcherMiddleware)
);
```

### 2. Define action type, action creator and dispatch action

With **redux-dispatcher**, the action type is implicitly computed according to the ```key``` passed to ```createDispatcher``` method and the name of the action creator.

But if you want to explicitly specify a type, you can include a ```type``` property in the return object.
```js
import { createDispatcher } from 'redux-dispatcher';

const key = "profile";

const mapDispatchToAC = {
    // type = "profile/FETCH_PROFILE"
    // if the action doesn't depend on parameters, you can just write a plain object
    fetchProfile: {loading: true},

// if not explicitly specified, the action type will be automatically set: type = "profile/UPDATE_PROFILE"
    updateProfile: (username, password) => ({
        // type: "UPDATE_PROFILE",     you can specify the action type here
        username, password
    })
};

const profileDispatcher = createDispatcher(key, mapDispatchToAC);
```

To dispatch action, you can just import the dispatcher you need and dispatch action anywhere you want

```js
profileDispatcher.updateProfile("my_username", "my_password");
```

### 3. Handle action in reducer

Create ```reducer``` with **redux-dispatcher** is as easy as create a usual ```reducer```, with less code.
```js
import { createReducer } from 'redux-dispatcher';

const mapActionToReducer = () => ({
     // similar to fall-through case in switch statement
     [[
       profileDispatcher.fetchProfile,
       profileDispatcher.reloadProfile,
       profileDispatcher.resetProfile
     ]]: (state, payload) => payload,    // notice the payload, it doesn't have "type" property like action
     
     [profileDispatcher.loadingProfile]: {loading: true},    // you can just write a plain object if new state doesn't computed from current state or action payload
     
     [profileDispatcher.updateProfile]: (state, {username, password}) => ({
       username,
       password: encrypt(password)
     })    // only return what data need to be merged in state
     
     // the default case is handled automatically
})

const profileReducer = createReducer(initialState, mapActionToReducer);

const rootReducer = combineReducers({
  profile: profileReducer,
});
```

### 4. Advanced functionalities
This section describes some useful features and extensions you may find interesting like thunk and immutable helper.

#### Retrieve side effect result after dispatching an action
<details>
<summary>
When your action trigger some side effect (like fetching API), 
you can use built-in hooks <b>dispatchResult</b> or <b>waitResult</b> to dispatch and subscribe for results from action.

(Available from v1.9.6)
</summary>

[See example](https://github.com/blueish9/redux-dispatcher/example/enhanceAction.js).

Use case with React:
```js
const mapDispatchToAC = {
 fetchProfile: userId => ({ userId }),
};

const userDispatcher = createDispatcher('user', mapDispatchToAC);
```
```js
// Component A
async componentDidMount() {
 const action = userDispatcher.fetchProfile(userId)
 const profile = await action.waitResult()
 // profile = { name: "Emily" }
}
```
In your side effect handler (example with [Redux Saga](https://redux-saga.js.org)):
```js
import { take } from 'redux-saga/effects'

function* fetchProfile(action) {
 const profile = { name: "Emily" }   // call your side effect here (like API request)
 action.dispatchResult(profile)
}

function* sagaWatcher() {
 yield take(userDispatcher.fetchProfile, fetchProfile)
}
```

If you want to subscribe for result from other places:
```js
// Component A calls userDispatcher.fetchProfile
// but Component B and Component C also want to subscribe for the action's result

import { waitResult } from "redux-dispatcher";

// Component B
async componentDidMount() {
 // this Promise will be resolved when dispatchResult is called.
 // if dispatchResult has already been called before, this waitResult will immediately return a cached result
 const result = await waitResult(userDispatcher.fetchProfile)
}

// Component C
componentDidMount() {
 const unsubscribe = waitResult(userDispatcher.fetchProfile, result => {
  // each time dispatchResult is called, this callback will be triggered
 })

// to remove the callback from listening to result, simply call unsubscribe()
}

// in Component A, you can also subscribe for continuous results like in Component C
componentDidMount() {
 userDispatcher.fetchProfile(userId).waitResult(result => {
  // each time dispatchResult is called, this callback will be triggered
 })
} 
```
</details>

---

#### Define thunk like your favourite [Redux Thunk](https://github.com/reduxjs/redux-thunk)
<details>
<summary>
See example
</summary>

```js
const mapDispatchToAC = {
 fetchUser: id => ({dispatch, getState, context}) => {
  // do something
 }
}
```

You can also provide global context to `dispatcherMiddleware`
just like how Redux Thunk middleware **inject** custom arguments,
[read more](https://github.com/reduxjs/redux-thunk#injecting-a-custom-argument).
```js
import {dispatcherMiddleware} from "redux-dispatcher"

const context = {
 BASE_API_URL,
 FetchHelper
}

const store = createStore(
        reducer,
        applyMiddleware(dispatcherMiddleware.withContext(context))
)

// reducer
const mapActionToReducer = context => {

}
```
</details>

---

#### Immutable helpers for state
<details>
<summary>
See example
</summary>

```js
const profileReducer = createReducer(initialState, {
 /* equivalent to:
    case "profile/UPDATE_STREET":
       return {
         ...state,
         userInfo: {
           ...state.userInfo,
           address: {
             ...state.userInfo.address,
             street: action.street
           }
         }
       }
 */
 [profileDispatcher.updateStreet]: (state, {street}, {set}) => ({
  street: set('userInfo.address.street', street)
 })
});
```

All immutable helper functions are based on [dot-prop-immutable](https://github.com/debitoor/dot-prop-immutable)
```js
[profileDispatcher.updateStreet]: (state, payload, {get, set, merge, toggle, remove}) => ({

})
```
</details>

---
#### Easily manage action types
<details>
<summary>
See example
</summary>

```js
profileDispatcher.key === "profile"    // true
profileDispatcher.updateProfile.type === "profile/UPDATE_PROFILE"    // true

/* equivalent to:
   const handler = {
      "profile/UPDATE_PROFILE": (state, payload) => {}
   }
*/
const handler = {
 [profileDispatcher.updateProfile]: (state, payload) => {}
} 
```

An example when working with [Redux Saga](https://redux-saga.js.org): Instead of passing an action type, you can just pass a dispatcher function to the ```takeLatest``` function.
```js
const action = yield take(profileDispatcher.updateProfile)
// action = { type, username, password }
```
</details>

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