Write concise, non-redundant code by eliminating unnecessary duplication and using simpler syntax where possible. This improves readability and maintainability. Key practices: - Remove redundant property definitions when extending interfaces or classes that already provide them - Extract common logic into shared functions to prevent duplication across files - Use direct function references instead of arrow function wrappers when the signature matches - Make exported types comprehensive to avoid forcing users to combine multiple types Examples: ```typescript // Instead of redundant property definitions: export interface Derived extends Value { r_version: number; // ❌ Already defined in Value } // Use inheritance properly: export interface Derived extends Value { // ✅ Only add new properties } // Instead of arrow function wrappers: elements.forEach(element => detach(element)); // ❌ // Use direct function reference: elements.forEach(detach); // ✅ // Make exported types complete: export type ClassValue = string | ClassArray | ClassDictionary; // ✅ ```