What?

Adds a new ESLint rule @wordpress/validate-package-json that validates package.json files using the WordPress npm-package-json-lint configuration.

Why?

Currently, @wordpress/scripts provides a lint-pkg-json command that validates package.json files, but it has limitations:

• Not integrated with ESLint - runs as a separate command (wp-scripts lint-pkg-json)
• No editor integration - developers don't see errors in real-time while editing
• Manual execution required - easy to forget to run before committing

This leads to:

• Inconsistent property ordering across packages
• Unsorted dependencies making diffs harder to review
• Missing required fields like homepage, keywords, etc.
• License value inconsistencies

By integrating npm-package-json-lint into ESLint, developers get:

Immediate feedback in their editor as they type

• Auto-fix capabilities for ordering issues (eslint --fix)
• Single linting workflow - same tool for both code and package.json
• Consistent enforcement across all packages without manual intervention
• Better DX - errors appear inline with other ESLint diagnostics

How?

New ESLint Rule:

• Created validate-package-json rule that wraps npm-package-json-lint
• Integrates with @wordpress/npm-package-json-lint-config
• Supports auto-fixing for:
  • Property ordering (prefer-property-order)
  • Alphabetical dependency sorting (all dependency types)

Features:

• Reports all npm-package-json-lint issues as ESLint diagnostics
• Highlights specific properties in error locations
• Configurable via rules option to disable/override specific checks

New Config Preset:

• Added package-json-lint preset: plugin:@wordpress/eslint-plugin/package-json-lint
• Automatically applies to all package.json files

Testing Instructions

Sample eslint configuration:

{
	"extends": [
		"plugin:@wordpress/eslint-plugin/package-json-lint",
		"plugin:@wordpress/eslint-plugin/recommended-with-formatting"
	],
	// Necessary if using other rules for JS/TS files in addition to package.json rules
	"overrides": [
		{
			"files": ["package.json"],
			"parser": "jsonc-eslint-parser"
		}
	]
}