use-root-reducer

use-root-reducer

A helper to create and maintain a global state without redux. (based on react hooks)

Install

$ npm i use-root-reducer --save

Usage

First of all, create a global state and a global dispatch function in your root component:

// app.jsx
import React, { useReducer } from "react";
import useRootReducer from "use-root-reducer";
import { fooReducer, barReducer } from "./reducer";
import { StateContext, DispatchContext } from "./context";

const App = ({ children }) => {
  const [state, dispatch] = useRootReducer({
    foo: useReducer(fooReducer, "foo"),
    bar: useReducer(barReducer, "bar")
  });
  return (
    <DispatchContext.Provider value={dispatch}>
      <StateContext.Provider value={state}>{children}</StateContext.Provider>
    </DispatchContext.Provider>
  );
};

export default App;

You can pass your global state and global dispatch method (it will have foo and bar key-value in the above example) to your children components via props or with React Context API.

Second, it's recommended to maintain your context code in a independent file:

// context.jsx
import React from "react";

export const StateContext = React.createContext({});

export const DispatchContext = React.createContext(null);

export const OtherContext = React.createContext();

In the end, in your child components you can access your global state and global dispatch with useContext:

//
import React from "react";

import { StateContext, DispatchContext } from "./context.js";

export default () => {
  const state = React.useContext(StateContext);
  const dispatch = React.useContext(DispatchContext);

  const { foo, bar } = state;

  return (
    <button
      onClick={() => {
        // dispatch your action and will be received in all your reducers
        dispatch({ type: "update", payload: "foo updated", meta: "foo" });
      }}
    >{`${foo} and ${bar}`}</button>
  );
};

License

MIT