eq-swift — Zero-config Rust-to-Swift FFI

A thin, ergonomic wrapper around UniFFI that lets you write your entire foreign interface in Rust — no UDL files, no build.rs, no setup!() call, no duplication.

Just annotate your items with #[eqswift::export] or #[derive(eqswift::Record)] and build. The first #[eqswift::export] automatically initializes UniFFI.

Quick Start

#[eqswift::export]
pub fn add(a: u32, b: u32) -> u32 {
    a + b
}

#[derive(eqswift::Record)]
pub struct Person {
    pub name: String,
    pub age: u32,
}

#[derive(eqswift::Object)]
pub struct Greeter;

#[eqswift::export]
impl Greeter {
    // Automatically detected as constructor — no attribute needed
    pub fn new() -> Self {
        Self
    }

    pub fn greet(&self, name: String) -> String {
        format!("Hello, {name}!")
    }
}

Then build and generate Swift bindings:

cargo build
cargo eqswift swift --out-dir eq-swift/swift/Generated

Macros

Supported Types

Most Rust primitives map directly to Swift:

See the UniFFI type docs for the complete list.