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16.03 Using Redux Devtools

Installing Redux Devtools plugin​

For Chrome: chrome.google.com: Chrome Web Store

Read more: github.com: Redux Devtools Extension

index.js​

index.js
import React from "react";
import ReactDOM from "react-dom";
import { Provider } from "react-redux";
import { applyMiddleware, combineReducers, compose, createStore } from "redux";
import App from "./App";
import "./index.css";
import registerServiceWorker from "./registerServiceWorker";
import counterReducer from "./store/reducers/counter";
import resultReducer from "./store/reducers/result";

const rootReducer = combineReducers({
  ctr: counterReducer,
  res: resultReducer,
});

const logger = (store) => {
  return (next) => {
    return (action) => {
      console.log("[Middleware] Dispatching", action);
      const result = next(action);
      console.log("[Middleware] next state", store.getState());
      return result;
    };
  };
};

const composeEnhancers = window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__ || compose;

const store = createStore(
  rootReducer,
  composeEnhancers(applyMiddleware(logger))
);

ReactDOM.render(
  <Provider store={store}>
    <App />
  </Provider>,
  document.getElementById("root")
);
registerServiceWorker();