A technical publication covering type-level programming, template literal types, branded primitives, structural typing, and runtime validation.
// Advanced recursive mapped type to enforce deep immutability at compile time
type DeepReadonly<T> = T extends Function | Primitive
? T
: T extends Map<infer K, infer V>
? ReadonlyMap<DeepReadonly<K>, DeepReadonly<V>>
: T extends object
? { readonly [K in keyof T]: DeepReadonly<T[K]> }
: T;Using conditional types, infer keywords, and union distributions to enforce valid state transitions at compile time.
Preventing accidental mixing of primitive IDs, currency amounts, and validated strings using intersection branding techniques.
Understanding function parameter bivariance, array subtyping pitfalls, and how `strictFunctionTypes` protects your codebase.