Integrating TypeScript with Redux DevTools

Configure Redux DevTools with TypeScript to gain insights into the type-related issues at runtime as actions are dispatched and state changes occur.


// Actions.ts
export interface IncrementAction {
  type: 'INCREMENT';
}

export interface DecrementAction {
  type: 'DECREMENT';
}

export type Action = IncrementAction | DecrementAction;

Defines TypeScript interfaces for each action type and a union type for all actions.


// rootReducer.ts
import { combineReducers } from 'redux';
import { Action } from './Actions';

interface State {
  count: number;
}

function counterReducer(state: State = { count: 0 }, action: Action): State {
  switch (action.type) {
    case 'INCREMENT':
      return { count: state.count + 1 };
    case 'DECREMENT':
      return { count: state.count - 1 };
    default:
      return state;
  }
}

export const rootReducer = combineReducers({
  counter: counterReducer
});

Creates a rootReducer with TypeScript, combining reducers that are also typed.


// store.ts
import { createStore } from 'redux';
import { rootReducer } from './rootReducer';

const storeEnhancers = (window as any).__REDUX_DEVTOOLS_EXTENSION_COMPOSE__;

export const store = createStore(
  rootReducer,
  storeEnhancers ? storeEnhancers() : undefined
);

Integrates Redux DevTools with the store using window.__REDUX_DEVTOOLS_EXTENSION_COMPOSE__, which is specifically typed as any to allow access to potential browser extensions.


// index.ts
import * as React from 'react';
import * as ReactDOM from 'react-dom';
import { Provider } from 'react-redux';
import { store } from './store';
// Import your root component here
// import App from './App';

ReactDOM.render(
  <Provider store={store}>
    {/*<App />*/}
    <div>Replace with your app component</div>
  </Provider>,
  document.getElementById('root')
);

Renders the application and provides the Redux store to the React component tree. It should wrap the root App component inside the Provider from react-redux.


/* index.html */
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Redux DevTools with TypeScript</title>
</head>
<body>
    <div id="root"></div>
    <script src="./bundle.js"></script>
</body>
</html>

The HTML file serving as the entry point of the web application. It contains a root div where the React application will be mounted.


/* styles.css */
body {
  margin: 0;
  font-family: Arial, sans-serif;
}

#root {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

Basic CSS styling for the application. The root element is styled to center its children both horizontally and vertically.