This crate provides the TypestateBuilder derive macro for generating a typestate-pattern builder for structs.

Typestate Pattern

The typestate pattern helps ensure that a struct is initialized in steps, enforcing that certain fields must be set before others. This prevents the creation of incomplete structs and provides compile-time safety for field initialization.

Example usage:

#[derive(TypestateBuilder)]
struct Person {
name: String,
age: u32,
email: Option<String>,
}

let person = Person::builder()
.name("Alice".to_string())
.age(30)
.email(Some("alice@example.com".to_string()))
.build();