createThunknow supports adeserializerfunction to parse response datacreateThunkandcreateReducernow require strong parameters$applynow properly applies to the current state value instead of the payload while usingcreateReducer
This is a lightweight library designed to help reduce the amount of boilerplate usually required in Redux workflows. There are several easy to use functions that can help reduce the size of your redux/ducks files by dozens of lines!
Redux Creator is incredibly easy to install, simply run one of these lines in your terminal:
NPM: npm install redux-creator --save
Yarn: yarn add redux-creator
This is a fairly straightforward function that takes an action type as a method and returns a redux function. The only opinion it holds is that the data passed into the action body is referred to as payload.
const UPDATE_MESSAGE = 'messages/UPDATE_MESSAGE';
export const updateMessage = createAction(UPDATE_MESSAGE);
/*=> (payload) => ({
type: 'messages/UPDATE_MESSAGE',
payload
}) */Another easy to use function when making API calls in your redux cycle. This function takes an API util function and an action as arguments, and returns the default 'thunk' pattern of asynchronous actions. Thunks return promisable objects by default, and this helper is no different.
export const sendMessage = createThunk({
api: MessageAPI.send,
action: updateMessage,
});
/* => (data) => (dispatch) => {
MessageAPI.send(data)
.then((resp) => (
dispatch(updateMessage(resp));
return resp;
})
) */createThunk can also be used to handle errors, with an errorHandler function:
export const sendMessage = createThunk({
api: MessageAPI.send,
action: updateMessage,
errorHandler: updateMessageErrors
});
/* => (data) => (dispatch) => (
MessageAPI.send(data)
.then((resp) => {
dispatch(updateMessage(resp));
return resp;
})
.catch((err) => {
dispatch(updateMessageErrors(err));
return err;
})
) */An optional deserializer layer can also be applied to createThunk if you are expecting to recieve API data that requires parsing. Deserializers should be provided as functions:
export const sendMessage = createThunk({
api: MessageAPI.send,
action: updateMessage,
deserializer: parseMessageResponse
});
/* => (data) => (dispatch) => (
MessageAPI.send(data)
.then((resp) => parseMessageResponse(resp))
.then((resp) => {
dispatch(updateMessage(resp));
return resp;
})
) */This is a helper method which takes in the root reducer in your redux and an array of middleware and creates a store with those middlewares applied.
export default configureStore(RootReducer, [thunk])
// => (preloadedState = {}) => createStore(RootReducer, preloadedState, applyMiddleware(thunk))This is the most complicated of the helper functions but also has the biggest payoff. Reducers are often bulky and hard to read, and createReducer aims to create a prettier looking reducer that's much easier to grok. This is the most opinionated of the helper methods, and a somewhat specific syntax must be followed in order for it to properly work.
const UPDATE_MESSAGE = 'messages/UPDATE_MESSAGE';
const UPDATE_MESSAGE_ERRORS = 'messages/UPDATE_MESSAGE_ERRORS';
const messageReducerActions = {
[UPDATE_MESSAGE]: '{ "currentUser": { "message": { "$set": $payload } } }',
[UPDATE_MESSAGE_ERRORS]: '{ "currentUser": { "errors": { "message": { "$set": $payload } } } }'
}
export default createReducer({
reducerCases: messageReducerActions,
initialState
});
/* => (state = initialState, action) => {
let reducerObj = {
'messages/UPDATE_MESSAGE': (payload) => update(state, { currentUser: { message: { $set: payload } }),
'messages/UPDATE_MESSAGE_ERRORS': (payload) => update(state, { currentUser: { errors: { message: { $set: payload } } } })
};
return reducerObj[action.type](action.payload) || state;
}
*/The pattern is as follows: createReducer accepts an Object of action types as keys and JSON strings as values. The JSON strings use the same syntax as the update method from the immutability-helper library, which is used internally as shown, but the strings must be valid JSON to work. After calling for an update operation like $set or $merge, the value of that key must be marked as $payload. Because the value is just a string it won't throw any invalid JSON syntax errors until it is parsed by createReducer, at which time $payload will be substituted with the proper value. This is also the reason createAction uses the naming convention of $payload on its action data; createReducer relies on action.payload to function properly.
If you wish to use immutability-helper's built-in $apply method it is important to note the format of the reducer case. Instead of the typical JSON string, createReducer expects an object with the keys string, for the JSON string including $callback instead of $payload, and callback, which is the actual callback function.
Copyright (c) 2017 Sean Beyer
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