TypeScript

Title

TypeScript Architecture Patterns

Patterns

• { "name": "Branded Types for Domain Modeling", "purpose": "Prevent primitive type confusion in domain logic", "implementation": "type UserId = string & { readonly __brand: 'UserId' }; Use type guards and smart constructors to validate at boundaries." }
• { "name": "Discriminated Unions for State Management", "purpose": "Model states with exhaustive checking", "implementation": "type State = { kind: 'loading' } | { kind: 'success'; data: T } | { kind: 'error'; error: E }; Use never-based exhaustiveness checks." }
• { "name": "Builder Pattern with Type-Safe Fluent API", "purpose": "Construct complex objects with compile-time validation", "implementation": "Chain optional methods using accumulator types that track what's been set, enforcing required fields at compile time." }
• { "name": "Type-Safe Dependency Injection", "purpose": "Eliminate runtime DI errors through compile-time guarantees", "implementation": "Use Symbols and mapped types to create a registry where consumers get typed access to services." }
• { "name": "Phantom Types for Validated Data", "purpose": "Distinguish between unvalidated and validated data at the type level", "implementation": "Wrap types with phantom properties indicating validation state, ensuring validators run before use." }