Crate wasm_bindgen_duck_type

Macro to automatically generate duck type interfaces with wasm_bindgen

Usage

The [wasm_bindgen_duck_type] attribute macro can be applied to structs to generate the duck type interface for the struct.

Example

JavaScript:

function MyFun() {
    return {
        number: 20,
        fun: () => {
            console.log("Hello, World!")
        }
    };
}
 
function GetNumber(input) {
    return input.number
}

Rust:

use wasm_bindgen_duck_type::wasm_bindgen_duck_type;
use wasm_bindgen::prelude::*;
 
#[wasm_bindgen]
extern "C" {
    fn MyFun() -> MyType;
    fn GetNumber(input: MyType) -> i32;
}
 
#[wasm_bindgen_duck_type]
struct MyType {
    number: i32,
    fun: js_sys::Function,
}
 
fn main() {
    let result = MyFun();
 
    result.fun().call0(&JsValue::NULL);
    result.set_number(10);
 
    let input = MyType::default(); // All fields are null / default
    let input = MyType::new(
        42,
        JsValue::NULL.into() // Pass a function
    );
 
    let num = GetNumber(input); // 42
}

Attribute Macros

wasm_bindgen_duck_type

Attribute macro to generate duck type interface