Mirror Types to Sever Dependencies

Overview

When you depend on types from external packages, changes to those types can break your code. Mirroring types - creating your own local copies of external types - severs this dependency. This is useful when you only need a subset of external types or when you want to insulate yourself from external changes.

When to Use This Skill

• Depending on external types
• Avoiding tight coupling to external packages
• External types might change frequently
• Building adapters or wrappers
• Types are only used internally

The Iron Rule

Mirror external types when you want to sever dependencies. Define only the subset you need, insulated from external changes.

Example