Eslint-rule-composer helps in creating and testing complex ESLint rules by composing simpler, reusable rules. It allows developers to easily combine and modify existing rules, enhancing code quality without redundant logic. This tool simplifies rule creation, encouraging modularity and maintainability in ESLint configurations. The package aids in writing more effective and targeted linting rules. It focuses on the "rule" part of ESLint rules and offers no utilities related to configuration.