Advanced TypeScript Patterns for Large-Scale Applications

TypeScript's type system is powerful and flexible. For large-scale applications, leveraging advanced patterns can significantly improve code quality and maintainability. ## Generic Constraints Use constraints to make generics more specific: ```typescript function getProperty(obj: T, key: K): T[K] { return obj[key]; } ``` ## Conditional Types Create types that depend on conditions: ```typescript type IsString = T extends string ? true : false; ``` ## Mapped Types Transform existing types: ```typescript type Readonly = { readonly [P in keyof T]: T[P]; }; ``` ## Type Guards Runtime type checking: ```typescript function isString(value: unknown): value is string { return typeof value === 'string'; } ``` ## Utility Types Leverage built-in utility types: - Partial - Required - Pick - Omit - Record ## Discriminated Unions Type-safe state management: ```typescript type Result = | { success: true; data: T } | { success: false; error: string }; ``` ## Conclusion These advanced patterns help you write more type-safe, maintainable code. Start incorporating them gradually into your projects and watch your code quality improve.