Switch To ESLint@9 In `ckeditor/ckeditor5-linters-config`

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Task Description

As part of the ongoing efforts to improve the development experience in the CKEditor 5 project, we are working on upgrading the ESLint configuration to the latest version, ESLint@9. This change is a crucial step towards ensuring that our codebase adheres to the latest best practices and security standards.

Background and Motivation

The current ESLint configuration in the ckeditor/ckeditor5-linters-config repository is based on an older version of ESLint. With the release of ESLint@9, we have an opportunity to take advantage of new features, improved performance, and enhanced security. Upgrading to ESLint@9 will enable us to leverage the latest developments in the ESLint ecosystem and ensure that our codebase remains secure and maintainable.

Definition of Done

To complete this task, we need to follow these steps:

Target Branch

The pull request should target the #epic/ck/18475-eslint9 branch. This branch is specifically created for this task and will serve as a temporary workspace for the upgrade process.

Upgrade to ESLint@9

The ckeditor/ckeditor5-linters-config repository will be updated to use ESLint@9. This involves installing the latest version of ESLint and updating the configuration files to work with the new version.

Upgrade Minimal Node.js Version

As ESLint v9 requires a specific Node.js version, we need to upgrade the minimal Node.js version to 22.0.0. This ensures that our development environment meets the requirements for running ESLint@9.

Benefits and Impact

Upgrading to ESLint@9 will bring several benefits to the CKEditor 5 project:

  • Improved Code Quality: ESLint@9 introduces new rules and features that help improve code quality, security, and maintainability.
  • Enhanced Security: The latest version of ESLint includes security fixes and improvements that help protect against common web application vulnerabilities.
  • Better Performance: ESLint@9 is optimized for performance, reducing the time it takes to run linters and improving overall development experience.
  • Future-Proofing: By upgrading to ESLint@9, we ensure that our codebase remains compatible with future versions of ESLint and the JavaScript ecosystem.

Implementation Plan

To implement this change, we will follow these steps:

Step 1: Create a New Branch

Create a new branch, #epic/ck/18475-eslint9, from the main branch. This branch will serve as a temporary workspace for the upgrade process.

Step 2: Upgrade ESLint

Update the package.json file to install ESLint@9. Run the command npm install eslint@9 to install the latest version of ESLint.

Step 3: Update Configuration Files

Update the ESLint configuration files to work with ESLint@9. This involves updating the eslint.config.js file and any other configuration files that may be affected by the upgrade.

Step 4: Upgrade Minimal Node.js Version

Update the minimal Node.js version to 22.0.0 by running the command npm install node@22.0.0.

Step 5: Test and Verify

Test the ESLint configuration and verify that it works as expected. Run the command npm run lint to test the linters and ensure that there are no errors or warnings.

Conclusion

Upgrading to ESLint@9 is a crucial step towards improving the development experience in the CKEditor 5 project. By following the steps outlined in this document, we can ensure that our codebase remains secure, maintainable, and compatible with future versions of ESLint and the JavaScript ecosystem.

Frequently Asked Questions

As we upgrade the ESLint configuration to ESLint@9 in the ckeditor/ckeditor5-linters-config repository, we've received several questions from the community. Below, we'll address some of the most frequently asked questions to provide clarity on the upgrade process.

Q: What is ESLint@9, and why do we need to upgrade?

A: ESLint@9 is the latest version of the ESLint linter, which is used to enforce coding standards and catch errors in JavaScript code. We need to upgrade to ESLint@9 to take advantage of new features, improved performance, and enhanced security.

Q: What are the benefits of upgrading to ESLint@9?

A: Upgrading to ESLint@9 brings several benefits, including:

  • Improved Code Quality: ESLint@9 introduces new rules and features that help improve code quality, security, and maintainability.
  • Enhanced Security: The latest version of ESLint includes security fixes and improvements that help protect against common web application vulnerabilities.
  • Better Performance: ESLint@9 is optimized for performance, reducing the time it takes to run linters and improving overall development experience.
  • Future-Proofing: By upgrading to ESLint@9, we ensure that our codebase remains compatible with future versions of ESLint and the JavaScript ecosystem.

Q: What are the system requirements for running ESLint@9?

A: ESLint@9 requires Node.js version 18.18.0 or higher, including 20.9.0 or higher, or 21.1.0 or higher. We will upgrade the minimal Node.js version to 22.0.0 as part of the upgrade process.

Q: How do I upgrade to ESLint@9?

A: To upgrade to ESLint@9, follow these steps:

  1. Create a new branch, #epic/ck/18475-eslint9, from the main branch.
  2. Update the package.json file to install ESLint@9 by running the command npm install eslint@9.
  3. Update the ESLint configuration files to work with ESLint@9.
  4. Upgrade the minimal Node.js version to 22.0.0 by running the command npm install node@22.0.0.
  5. Test and verify the ESLint configuration.

Q: What if I encounter issues during the upgrade process?

A: If you encounter issues during the upgrade process, please reach out to the CKEditor 5 community for assistance. We'll do our best to provide guidance and support to ensure a smooth upgrade process.

Q: How will the upgrade affect my code?

A: The upgrade to ESLint@9 will not affect your code directly. However, you may need to update your code to comply with new rules and features introduced in ESLint@9. We recommend reviewing the ESLint documentation and configuration files to ensure that your code is compatible with the new version.

Q: Can I revert to the previous version of ESLint if I encounter issues?

A: Yes, you can revert to the previous version of ESLint if you encounter issues during the upgrade process. However, we recommend testing and verifying the new version thoroughly reverting to the previous version.

Conclusion

Upgrading to ESLint@9 is an important step towards improving the development experience in the CKEditor 5 project. By following the steps outlined in this document and addressing the frequently asked questions, we can ensure a smooth upgrade process and take advantage of the benefits offered by the latest version of ESLint.