design-patterns

RTK Rust Design Patterns Patterns that apply to RTK's filter module architecture. Focused on CLI tool patterns, not web/service patterns. Pattern 1: Newtype (Type Safety) Use when: wrapping primitive types to prevent misuse (command names, paths, token counts). // Without Newtype — easy to mix up fn track ( input_tokens : usize , output_tokens : usize ) { ... } track ( output_tokens , input_tokens ) ; // Silent bug! // With Newtype — compile error on swap pub struct InputTokens ( pub usize ) ; pub struct OutputTokens ( pub usize ) ; fn track ( input : InputTokens , output : OutputTokens ) { ... } track ( OutputTokens ( 100 ) , InputTokens ( 400 ) ) ; // Compile error ✅ Show more