Error Compiling In Visual Studio Code - Error With Angular/core?

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Error Compiling in Visual Studio Code - Error with angular/core?

Introduction

Visual Studio Code (VS Code) is a popular code editor that supports a wide range of programming languages, including TypeScript and Angular. However, sometimes users may encounter errors while compiling their Angular projects in VS Code. In this article, we will explore a specific error that occurs when trying to compile an Angular project in VS Code, and provide a step-by-step guide to resolve the issue.

Error Description

The error message is as follows:

[{
	"resource": "/f:/git/clients/test/src/app/app.component.ts",
	"owner": "_generated_diagnostic_collection_name_#4",
	"code": "-991010",
	"severity": 8,
	"message": "changeDetection must be a member of ChangeDetectionStrategy enum from @angular/core\n  Value is of type 'ChangeDetectionStrategy$1'.",
	"startLineNumber": 7,
	"startColumn": 20,
	"endLineNumber": 7,
	"endColumn": 51
}]

This error occurs when trying to compile the app.component.ts file in the Angular project. The error message indicates that there is a problem with the changeDetection property in the ChangeDetectionStrategy enum from @angular/core.

Reproduction Steps

To reproduce this error, follow these steps:

  1. Create a new Angular project using the command ng new test.
  2. Open the app.component.ts file in VS Code.
  3. Add the following line of code to the file: changeDetection: ChangeDetectionStrategy.Default,
  4. Try to compile the project by running the command ng serve.

Expected Behavior

The expected behavior is that the project should compile successfully without any errors.

Logs and Screenshots

There are no logs or screenshots to provide as the error occurs during compilation.

Environment

Here are the details of the environment:

  • Angular Version: 19.2.2
  • Node Version: 20.11.1
  • Package Manager: npm 8.5.5
  • OS: Windows 11 Pro
  • VS Code Version: 1.98.1
  • Extension Version: 19.2
  • Angular Language Service: 19.2

Extension Options

There are no extension options configured for the Angular Language Service.

Anything Else Relevant?

This is a brand new project, and the error occurs immediately after adding the changeDetection property to the app.component.ts file.

Resolution

To resolve this error, follow these steps:

  1. Remove the changeDetection property from the app.component.ts file.
  2. Try to compile the project again by running the command ng serve.

If the error persists, try the following:

  1. Update the Angular CLI to the latest version by running the command ng update @angular/cli.
  2. Update the Angular Language Service to the latest version by running the command ng update @angular/language-service.
  3. Try to compile the project again by running the command ng serve.

If none of the above steps resolve the issue, try to create a new Angular project using the command ng new test and see if the error occurs in the new project.

Conclusion

In this article, we explored a specific error that occurs when trying to compile an Angular project in VS Code. We provided a step-by-step guide to resolve the issue, including removing the changeDetection property from the app.component.ts file, updating the Angular CLI and Angular Language Service to the latest versions, and trying to compile the project again. If none of the above steps resolve the issue, try to create a new Angular project using the command ng new test and see if the error occurs in the new project.
Error Compiling in Visual Studio Code - Error with angular/core?

Q&A

Q: What is the error message I'm seeing in Visual Studio Code?

A: The error message you're seeing is:

[{
	"resource": "/f:/git/clients/test/src/app/app.component.ts",
	"owner": "_generated_diagnostic_collection_name_#4",
	"code": "-991010",
	"severity": 8,
	"message": "changeDetection must be a member of ChangeDetectionStrategy enum from @angular/core\n  Value is of type 'ChangeDetectionStrategy$1'.",
	"startLineNumber": 7,
	"startColumn": 20,
	"endLineNumber": 7,
	"endColumn": 51
}]

Q: What is causing this error?

A: This error is caused by trying to set the changeDetection property to a value that is not a member of the ChangeDetectionStrategy enum from @angular/core.

Q: How do I resolve this error?

A: To resolve this error, follow these steps:

  1. Remove the changeDetection property from the app.component.ts file.
  2. Try to compile the project again by running the command ng serve.

If the error persists, try the following:

  1. Update the Angular CLI to the latest version by running the command ng update @angular/cli.
  2. Update the Angular Language Service to the latest version by running the command ng update @angular/language-service.
  3. Try to compile the project again by running the command ng serve.

Q: What are the system requirements for this error to occur?

A: The system requirements for this error to occur are:

  • Angular Version: 19.2.2
  • Node Version: 20.11.1
  • Package Manager: npm 8.5.5
  • OS: Windows 11 Pro
  • VS Code Version: 1.98.1
  • Extension Version: 19.2
  • Angular Language Service: 19.2

Q: Can I create a new Angular project and see if the error occurs?

A: Yes, you can create a new Angular project using the command ng new test and see if the error occurs in the new project.

Q: What are some common causes of this error?

A: Some common causes of this error are:

  • Trying to set the changeDetection property to a value that is not a member of the ChangeDetectionStrategy enum from @angular/core.
  • Using an outdated version of the Angular CLI or Angular Language Service.
  • Having a corrupted or outdated project configuration.

Q: How can I prevent this error from occurring in the future?

A: To prevent this error from occurring in the future, follow these best practices:

  • Always use the latest version of the Angular CLI and Angular Language Service.
  • Make sure to update your project configuration regularly.
  • Avoid trying to set the changeDetection property to a value that is not a member of the ChangeDetectionStrategy enum from @angular/core.

Q: What are some additional resources that can help me resolve this error?

A: Some additional resources that can help you resolve this error are: