[Snyk] Security upgrade eslint from 7.31.0 to 9.1.0

[shelomo]

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

Snyk changed the following file(s):

• package.json
• yarn.lock

Note for zero-installs users

If you are using the Yarn feature zero-installs that was introduced in Yarn V2, note that this PR does not update the .yarn/cache/ directory meaning this code cannot be pulled and immediately developed on as one would expect for a zero-install project - you will need to run yarn to update the contents of the ./yarn/cache directory.
If you are not using zero-install you can ignore this as your flow should likely be unchanged.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Inefficient Algorithmic Complexity SNYK-JS-MINIMATCH-15353389	170

Breaking Change Risk

Notice: This assessment is enhanced by AI.

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[shelomo]

This is a major version upgrade from ESLint v7 to v9, which includes two sets of significant breaking changes. Manual intervention is required to migrate configuration files and address rule changes.

Key Breaking Changes in v9.0:

• New Config Format: ESLint v9 introduces a new "flat" configuration file (eslint.config.js) and deprecates the traditional .eslintrc.* format. All configurations must be migrated to this new format. While a compatibility flag exists (ESLINT_USE_FLAT_CONFIG=false), the old format is considered deprecated.
• Node.js Version: Support for Node.js versions below 18.18.0 and version 19 has been dropped.
• Rule and Formatter Removals: The require-jsdoc and valid-jsdoc rules have been removed and must be replaced by the eslint-plugin-jsdoc plugin. Several core formatters have also been removed.
• Plugin Compatibility: All ESLint plugins must be verified for compatibility with v9 and the new flat config system.

Key Breaking Changes in v8.0:

• Node.js Version: Support for Node.js versions 10, 13, and 15 was dropped.
• API Changes: The CLIEngine class was removed in favor of the ESLint class, affecting any custom scripts that integrate with ESLint.
• Rule Updates: The eslint:recommended ruleset was updated, which may introduce new warnings.

Recommendation: This upgrade requires a significant migration effort. Developers must rewrite their ESLint configuration to the new flat format, update their Node.js version if necessary, and verify that all plugins and custom integrations are compatible with ESLint v9. It is highly recommended to follow the official migration guides.

Source: ESLint v9 Migration Guide, ESLint v8 Migration Guide

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[Copilot]

Pull request overview

This PR upgrades ESLint from 7.31.0 to 9.39.3 (not 9.1.0 as stated) to address a high-severity security vulnerability (Inefficient Algorithmic Complexity in minimatch, SNYK-JS-MINIMATCH-15353389). However, this upgrade introduces a critical breaking change that will prevent the project's linting from functioning.

Changes:

• Upgrades eslint from ^7.31.0 to ^9.1.0 in package.json (resolves to 9.39.3 in yarn.lock)
• Updates yarn.lock with ESLint 9.x dependency tree, including new packages for flat config system support

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
package.json	Updates ESLint version constraint from ^7.31.0 to ^9.1.0
yarn.lock	Reflects complete dependency tree changes for ESLint 9.39.3 upgrade, including new ESLint 9-specific packages

Critical Issue: ESLint 9.x requires @typescript-eslint packages version 8.x or higher. This project currently uses @typescript-eslint/eslint-plugin and @typescript-eslint/parser version 4.28.4, which are incompatible with ESLint 9.x. The linting functionality will fail when this PR is merged without also upgrading the TypeScript ESLint packages.

Additional Issue: There's a discrepancy between the PR description (which mentions version 9.1.0) and the actual installed version (9.39.3 per yarn.lock). While the newer version is generally better, this should be clarified.

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[Copilot]

This upgrade introduces a critical compatibility issue. ESLint 9.x requires @typescript-eslint packages version 8.x or higher, but this project is using @typescript-eslint/eslint-plugin and @typescript-eslint/parser version 4.28.4.

The TypeScript ESLint v4.x packages are not compatible with ESLint 9.x and will cause the linter to fail. You need to upgrade both @typescript-eslint/eslint-plugin and @typescript-eslint/parser to at least version 8.0.0 along with this ESLint upgrade.

Suggested change

	"@typescript-eslint/eslint-plugin": "^4.28.4",
	"@typescript-eslint/parser": "^4.28.4",
	"@typescript-eslint/eslint-plugin": "^8.0.0",
	"@typescript-eslint/parser": "^8.0.0",