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ViewsHow to use exported struct in JS file?
I have the following definitions in the Rust code:
#[wasm_bindgen]
pub struct Point {
x: i32,
y: i32,
}
#[wasm_bindgen]
impl Point {
#[wasm_bindgen(constructor)]
pub fn new(x: i32, y: i32) -> Point {
Point { x, y }
}
}
I logged the created object in JS file:
let p = new Point(23, 34);
console.log(p);
But it's giving me a pointer value with the prototype, I don't know how to use it.
How can I get a JS object like { x: 23, y: 34 } with the prototype?
1 answers
Answer question0
By default, wasm_bindgen doesn't include the actual fields of structs when passing them to JS, instead generating a wrapper object that simply has a pointer to the data on the (WASM) heap and exposes the methods/properties using the prototype. You should be able to access (public) fields and invoke methods using standard JS syntax, as shown here in the wasm-bindgen reference.
If you really want to pass the actual contents back, you can use JsValue::from_serde, which allows serializing any type that implements Serialize into a JS object. Note that this object will not expose the methods, however - it's intended for passing plain data across the JS/WASM boundary. This is documented here in the wasm-bindgen reference.