refactor

To restructure legacy code without altering behavior, you reorganize functions and modules while preserving external APIs. Automated testing validates that existing functionality remains intact throughout the structural cleanup process.

The best way to clean up a large codebase safely involves systematic planning and automated testing. This approach ensures structural changes improve readability and maintainability without introducing bugs or affecting existing functionality.

Yes, you can reorganize project modules while preserving external APIs. The process ensures only structural changes occur, keeping external functions intact while internal code organization improves for better maintainability.

To ensure existing tests pass after refactoring, the skill relies on automated testing validation. By systematically making only structural changes and preserving external APIs, existing tests confirm functionality remains unbroken.

A structured approach to code optimization is needed when maintaining or improving large codebases. It becomes essential for cleaning up legacy code or restructuring project directories with minimal risk of introducing bugs.

The main limitation of restructuring code without changing functionality is that only structural changes are permitted. You cannot alter external APIs or functions, meaning the process focuses strictly on reorganization rather than feature modification.