[Snyk] Security upgrade eslint from 6.6.0 to 9.0.0

[twilio-product-security]

Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Prototype Pollution SNYK-JS-FLATTED-15700433	278

Breaking Change Risk

Notice: This assessment is enhanced by AI.

---

Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

For more information:
🧐 View latest project report
📜 Customise PR templates
🛠 Adjust project settings
📚 Read about Snyk's upgrade logic

---

Learn how to fix vulnerabilities with free interactive lessons:

🦉 Prototype Pollution

[twilio-product-security]

This is a major upgrade across three major versions (v7, v8, and v9), introducing significant breaking changes. The most critical change is in v9, which makes the new "flat config" (eslint.config.js) the default configuration format, deprecating the traditional .eslintrc format.

Key Breaking Changes:

• ESLint v9.0.0:

  • New Default Config: The eslintrc format is deprecated. You must migrate your configuration to the new eslint.config.js flat config format. To continue using eslintrc, you must set the ESLINT_USE_FLAT_CONFIG environment variable to false.
  • Node.js Support: Dropped support for Node.js versions below 18.18.0 and version 19.
  • Removed Rules: The require-jsdoc and valid-jsdoc rules have been removed.
  • Formatter Removals: Several formatters including checkstyle, compact, junit, and tap have been removed.

• ESLint v8.0.0:

  • Node.js Support: Dropped support for Node.js versions 10, 13, and 15.
  • API Changes: The CLIEngine class was removed, which may affect integrations.
  • Rule Updates: The eslint:recommended preset was updated with new rules.

• ESLint v7.0.0:

  • Node.js Support: Dropped support for Node.js version 8.
  • Rule Changes: Core Node.js/CommonJS rules were deprecated and moved to the eslint-plugin-node plugin.

Recommendation:
This upgrade requires a mandatory migration of your ESLint configuration from .eslintrc to the new eslint.config.js flat format. It is a significant effort that should be handled carefully. Review the official migration guides for each major version to ensure a smooth transition.

Sources:

• ESLint v9 Migration Guide
• ESLint v8 Migration Guide
• ESLint v7 Migration Guide

Notice 🤖: This content was augmented using artificial intelligence. AI-generated content may contain errors and should be reviewed for accuracy before use.