Скачать или смотреть How to Debug Your Typescript React App in Chrome

Learn how to debug your Typescript React demo app seamlessly in Chrome using tips on configuring your project and leveraging DevTools for effective debugging.
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Debugging Your Typescript React App in Chrome: A Comprehensive Guide

Debugging a React application can sometimes feel like searching for a needle in a haystack, especially when you're working with Typescript. Whether you're a seasoned developer or just getting started, effective debugging techniques are crucial to streamline your development process. This guide will walk you through the steps to debug a Typescript React demo app in Chrome, helping you identify and resolve issues quickly.

Setting Up Your Environment

Before diving into debugging, it’s important to set up your development environment properly. Here’s how to configure your Typescript React project for optimal debugging.

Step 1: Create Your React Application

Start by creating your React application using the create-react-app tool with the Typescript template. Open your terminal and run:

[[See Video to Reveal this Text or Code Snippet]]

This command sets up a new React application named webclient with Typescript support.

Step 2: Configure TypeScript for Debugging

Next, you need to adjust your tsconfig.json file to enable source maps, which are essential for debugging your Typescript code effectively.

Navigate to the webclient directory and find tsconfig.json.

Update the file to include the following configuration:

[[See Video to Reveal this Text or Code Snippet]]

The "sourceMap": true line allows the browser to map your Typescript code to the generated JavaScript, making debugging easier.

Running Your Application

Once your application is set up and configured, it's time to start it and open it in Chrome.

Step 3: Start the Development Server

In your terminal, execute the following command from the webclient directory:

[[See Video to Reveal this Text or Code Snippet]]

This command will start your React application, typically accessible at http://localhost:3000.

Step 4: Access Chrome Developer Tools

Now that your app is running, you can access the Chrome Developer Tools to start debugging.

Right-click on your app page and select Inspect from the context menu (or press Ctrl+Shift+I or Cmd+Option+I on Mac).

Step 5: Navigate to the Sources Tab

Within the Developer Tools, follow these steps:

Select the Sources Tab: Click on the Sources tab in Developer Tools.

Locate Your Project Files: In the left-hand panel, navigate to Page under localhost:3000 where you can find your src directory.

Open Your Source Files: Open App.tsx or other relevant files from your project.

Setting Breakpoints

Now that you have access to your source files, you can set breakpoints to pause execution and inspect variables at specific points in your code.

Step 6: Adding Breakpoints

To add breakpoints:

Click on the line number in the code editor (for example, in App.tsx).

Your application will pause execution when it hits that line, allowing you to examine the local scope and the values of your variables thoroughly.

Hot Deployment and Further Debugging

One of the greatest features of the React development server is hot deployment. This means:

Any changes you make to your code will automatically be reflected in your application without requiring a manual refresh. This feature allows for quick iterations during debugging.

Using Firefox

If you prefer Firefox, you can follow the same steps but open the Debugger tab instead of the Sources tab in Chrome Developer Tools. The debugging process is largely the same across both browsers.

Conclusion

Debugging your Typescript React app in Chrome doesn't have to be a daunting task. By properly setting up your environment, configuring your TypeScript settings, and utilizing Chrome Developer Tools effectively, you can quickly identify and fix issues in your application. Rememb