Adding Deprecation Warning to Vue Router

Introduction

In this project, you will learn how to add a deprecation warning to the router.addRoutes() method in the vue-router-3.4.9 version. This is an important task as the router.addRoutes() method has been deprecated in Vue Router v3.5.0 and has been removed in Vue Router 4. By adding the deprecation warning, you can help developers using the older version of Vue Router to be aware of the upcoming changes and migrate to the new router.addRoute() method.

👀 Preview

🎯 Tasks

In this project, you will learn:

• Locate the addRoutes method in the vue-router-3.4.9/src/index.js file
• Add a deprecation warning to the addRoutes method
• Rebuild and publish the updated vue-router-3.4.9 package
• Restart the application and observe the warning message in the browser console

🏆 Achievements

After completing this project, you will be able to:

• Identify and modify deprecated methods in a library
• Understand the importance of providing deprecation warnings to help developers transition to newer versions
• Learn the process of rebuilding and publishing an updated version of a library
• Observe the effects of your changes in the running application

Skills Graph

Add a Deprecation Warning to router.addRoutes()

To get started, look at the directory structure of the files on the left as follows:

├── vue-router-3.4.9
├── vue.js
└── index.html

Click on Go Live button in the bottom right corner of WebIDE, to run the project.

Next, open "Web 8080" on the top of the VM and refresh it manually and you will see the page.

Open the browser console and observe the printout, which should look like the following with no warning messages.

In this step, you will learn how to add a deprecation warning to the router.addRoutes() method in the vue-router-3.4.9 version.

1. Open the vue-router-3.4.9/src/index.js file.

2. Locate the addRoutes method of the VueRouter class.

3. Add the following warning message to the method:

   addRoutes(routes: Array<RouteConfig>) {
     console.warn("router.addRoutes() is deprecated and has been removed in Vue Router 4. Use router.addRoute() instead.");
     this.matcher.addRoutes(routes);
     if (this.history.current !== START) {
       this.history.transitionTo(this.history.getCurrentLocation());
     }
   }

   This will print a warning message to the console when the addRoutes() method is called.

Restart the Application and Observe the Warning

In this step, you will restart the application and observe the warning message in the browser console.

1. In the terminal, navigate to the vue-router-3.4.9 directory.

2. Run the command npm install to install the dependencies. This process might take a while, please be patient. (If it gets stuck for a long time, please press Ctrl+C to terminate the process and then run this command again.)

3. After all dependencies have been successfully installed, run the command npm run build to rebuild and release the project.

4. Go back to the web page and refresh the page.

5. Open the browser console and observe the output. You should see the warning message printed to the console:

   router.addRoutes() is deprecated and has been removed in Vue Router 4. Use router.addRoute() instead.

   This confirms that the deprecation warning has been successfully added to the router.addRoutes() method.

Congratulations! You have completed the project by adding a deprecation warning to the router.addRoutes() method in the vue-router-3.4.9 version.

Summary

Congratulations! You have completed this project. You can practice more labs in LabEx to improve your skills.