eslint-find-rules

ESLint utility (v5.0.0, released Dec 2024) that finds built-in and plugin rules missing from your custom ESLint config. Supports both legacy (.eslintrc) and flat config (eslint.config.js). Offers options to list all available rules, current rules, deprecated rules, plugin-specific rules, and unused rules. Actively maintained with support for ESLint v8.57+ and v9.18+. Compatible with Node >=18.20. Differentiators: CLI-first, zero-config for simple use, explicit flag for flat config, and options to include/exclude deprecated or core rules.