Top Front End Posts

Uninstall Angular CLI

Angular CLI (Command Line Interface) is a powerful tool for developing and managing Angular applications. However, there may be scenarios where you need to uninstall Angular CLI from your system. Whether it's for a fresh installation or troubleshooting purposes, the process is straightforward. In this article, we will provide you with a step-by-step guide on how to uninstall Angular CLI from your machine, accompanied by examples. Uninstalling Angular CLI: Follow these steps to uninstall Angular CLI from your system: Step 1: Open a Command Prompt or Terminal - On Windows, press `Win + R`, type `cmd`, and press Enter. - On macOS or Linux, open the Terminal application.
Step 2: Check Angular CLI Version Before uninstalling, it's helpful to know which version of Angular CLI is currently installed. You can check this by running the following command:
ng --version
This will display the Angular CLI version along with other related information. Step 3: Uninstall Angular CLI To uninstall Angular CLI, use the following command:
npm uninstall -g @angular/cli
Explanation: - `npm uninstall`: This command removes a package (in this case, the Angular CLI) from your global Node.js modules. - `-g`: This flag specifies that the package should be uninstalled globally. Step 4: Verify Uninstallation After the uninstallation process is complete, it's advisable to verify that Angular CLI has been successfully removed. Run the following command:
ng --version
This should result in a message indicating that the 'ng' command is not recognized, confirming the uninstallation. Example: Let's go through an example of uninstalling Angular CLI on a Windows machine:
# Open Command Prompt #
# Press Win + R, type cmd, and press Enter

# Check Angular CLI version
ng --version

# Uninstall Angular CLI
npm uninstall -g @angular/cli

# Verify uninstallation
ng --version

Conclusion:

Uninstalling Angular CLI is a straightforward process that involves using the npm package manager to remove the global installation. Following the steps outlined in this article, you can easily uninstall Angular CLI from your system, whether for a clean reinstallation or troubleshooting purposes. Always remember to check the version before uninstalling and verify the successful removal of Angular CLI afterward.
This error stems from Angular's strict mode, which ensures variables are properly initialized to avoid potential runtime errors. When you declare a @ViewChild property without initialising it in the constructor, TypeScript gets confused. It doesn't know whether the ViewChild will be assigned later in the component lifecycle, triggering the error.
Solution:
  • Use the non-null assertion operator: Tell TypeScript you trust the property will be assigned later.
@ViewChild('myElement') elementRef!: ElementRef; // Non-null assertion

ngAfterViewInit() {
  // Access elementRef safely
  console.log(this.elementRef.nativeElement);
}



  • Declare as optional: Define the property with | undefined in the type.
@ViewChild('myElement') elementRef: ElementRef | undefined;

ngAfterViewInit() {
  // Use optional chaining to access elementRef safely
  if (this.elementRef) {
    console.log(this.elementRef.nativeElement);
  }
}

  • The best approach depends on your situation:

    • For asynchronous access, the non-null assertion operator works well with careful after-initialization checks.
    • Optional chaining and the | undefined type offer safety for potentially null ViewChild elements.