m05-type-driven
Compile-time state validation through type encoding, eliminating invalid states at the type level.
- Covers six core patterns: newtype for type-safe primitives, type state for state machines, PhantomData for variance tracking, marker traits for capability flags, builders for gradual construction, and sealed traits for closed impl sets
- Emphasizes asking "can the compiler catch this?" before adding runtime validation, with decision guides mapping common needs to appropriate patterns
- Includes anti-patterns section contrasting runtime approaches (boolean flags, string semantics, public fields) with type-driven alternatives
- Provides trace-up and trace-down navigation to related skills for domain modeling, trait design, and error handling
Type-Driven Design
Layer 1: Language Mechanics
Core Question
How can the type system prevent invalid states?
Before reaching for runtime checks:
- Can the compiler catch this error?
- Can invalid states be unrepresentable?
- Can the type encode the invariant?
Error → Design Question
| Pattern | Don't Just Say | Ask Instead |
|---|
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