This is the unpublished documentation of wasm-bindgen, the published documentation is available on the main Rust and WebAssembly documentation site . Features documented here may not be available in released versions of wasm-bindgen.

`JsValue`

`T` parameter	`&T` parameter	`&mut T` parameter	`T` return value	`Option<T>` parameter	`Option<T>` return value	JavaScript representation
Yes	Yes	No	Yes	No	No	Any JavaScript value

Example Rust Usage


# #![allow(unused_variables)]
#fn main() {
use wasm_bindgen::prelude::*;

#[wasm_bindgen]
pub fn take_js_value_by_value(x: JsValue) {}

#[wasm_bindgen]
pub fn take_js_value_by_shared_ref(x: &JsValue) {}

#[wasm_bindgen]
pub fn return_js_value() -> JsValue {
    JsValue::NULL
}

#}

Example JavaScript Usage

import {
  take_js_value_by_value,
  take_js_value_by_shared_ref,
  return_js_value,
} from './guide_supported_types_examples';

take_js_value_by_value(42);
take_js_value_by_shared_ref('hello');

let v = return_js_value();