react-action-listener

Middleware, React hook which allows making side effect and listening actions of Context or Redux

Motivation

In 'redux-saga', to change the local state when an action is dispatched, it is necessary to change local state to globally using Redux, Context and etc. It becomes maintenance difficult if these kinds of works are repeated.

To solve this problem I made 'redux-action-listener' by inheriting the work of redux-listener.

You can make side effects and listening actions more simply and lightly than 'redux-saga'. Also, by providing a hook version, you don't have to move local state to global state.

Install

npm i react-action-listener
yarn add react-action-listener

Usages

Much like redux-saga

import { createMiddleware } from 'react-action-listener';

const middleware = createMiddleware();
// 1. Apply middleware.
const store = createStore(reduce, {}, applyMiddleware(middleware);

// 2. Register listener.
middleware.addListener((action, dispatch) => {
  // Now you can listen 'ADD' when button is pressed.
  // {"type":"ADD","payload":1}
  console.log(`${JSON.stringify(action)}`);
});

const onClickPlus = () => {
  // When the button is clicked, an action 'ADD' is dispatched.
  // Note: You must provide property 'type'
  store.dispatch({ type: 'ADD', payload: 1 });
};

return <button onClick={onClickPlus}>add</button>;

Hook

import { createMiddleware, useActionListener } from 'react-action-listener';
// 1. Apply global middleware.
const store = createStore(reduce, {}, applyMiddleware(createMiddleware()));

// 2. Use hook.
useActionListener('ADD', (action, dispatch) => {
  // Now you can listen 'ADD' when the button is pressed.
  // {"type":"ADD","payload":1}
  console.log(`${JSON.stringify(action)}`);
});

const onClickPlus = () => {
  // When the button is clicked, an action 'ADD' is dispatched.
  store.dispatch({ type: 'ADD', payload: 1 });
};

return <button onClick={onClickPlus}>add</button>;

Context

import { createMiddleware, useActionListener } from 'react-action-listener';
// Note: you must provide config.isContext = true
// You will be able to see redux-logger style logs for dispatched action when you provide isDebugContext = true
const middleware = createMiddleware({ isContext: true, isDebugContext: true });

const [state, dispatch] = useReducer(counterReducer, initialValues);

function increaseAction(dispatch) {
  const action = {
    type: 'ADD',
    payload: 1,
  };

  // 1. Apply middleware.
  middleware(action);
  dispatch(action);
}

// 2. Use hook.
// Note: when you use Context, dispatch will not be provided as parameter.
useActionListener('ADD', (action) => {
  // {"type":"ADD","payload":1}
  console.log(`${JSON.stringify(action)}`);
});

Hybrid

You can also mix up.

import { createMiddleware, useActionListener } from 'react-action-listener';
// 1. Apply global middleware.
const middleware = createMiddleware();

useActionListener('ADD', (action, dispatch) => {
  //...
});

middleware.addListener('ADD', (action, dispatch) => {
  // ...
});

API

createMiddleware({ isContext, isDebugContext });

• isContext: boolean
  • When you want to use middleware with Context you must provide this to true
  • Note: You will not be able to use middleware with Redux.
• isDebugContext: boolean
  • When you use middleware with Context, you can also log dispatched actions by setting it true.

useActionListener(actionType, listener);

• actionType: string | string[]
  • The action type or an array of action types to match.
• listener: (action, dispatch) => void
  • The callback function which will be called when an action of specified types is dispatched.
  • action: object
    • Dispatched action.
  • dispatch: Dispatch<AnyAction>(action: AnyAction) => AnyAction
    • Equals with store.dispatch, but wrapped with setTimeout(() => {...}, 0)
    • By using this, you can ensure another action in listener can be dispatched as soon as the first dispatching action is completed.
    • Note: when you set isContext: true, dispatch will not be provided as parameter.

Links

• Examples

  • Counters

  • Counters (hook)

  • Counters (Context)

    See also here

Contributing

Contributions, issues and feature requests are welcome!

Feel free to check issues page. You can also take a look at the contributing guide.

Contributors

Jeong Hoon Park

License

Copyright © 2021 Jeong Hoon Park.

This project is MIT licensed.

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