swift-library-design

Design a Swift library API by applying Protocols with Associated Types to enable flexible, testable compositions. This protocol-oriented approach ensures compile-time safety while allowing extensible public interfaces across module boundaries.

The best way to build a type-safe DSL in Swift is by using Result Builders. This pattern allows you to construct complex, composable hierarchies declaratively while enforcing compile-time safety constraints within your library's public API.

Swift handles noncopyable types by enforcing strict ownership rules across module boundaries. Applying noncopyable API patterns in your public interfaces guarantees zero-copy performance and prevents unintended resource duplication at compile time.

You can optimize Swift library performance by applying inlining hints and zero-copy patterns across module boundaries. This performance-first API design minimizes reference counting overhead and ensures fast execution for public framework components.

You need protocols with associated types when building a Swift framework that requires flexible, type-safe compositions. They allow your public API to define flexible contracts that enable extensible and testable designs without sacrificing compile-time safety.

Result builders require strict compile-time syntax conformity, limiting dynamic runtime composition. While they excel at building declarative DSLs, complex control flow or runtime-dependent logic within the Swift library API may fall outside their safe, static builder pattern capabilities.