napi-rs Docs

Wrap native object

Wrap native object

Wraps a native instance in a JavaScript object. The native instance can be retrieved later using Env::unwrap.

struct Native {
value: i32,
}
#[js_function(1)]
fn attach_native_object(ctx: CallContext) -> Result<JsUndefined> {
let count: i32 = ctx.get::<JsNumber>(0)?.try_into()?;
let mut this: JsObject = ctx.this_unchecked();
ctx
.env
.wrap(&mut this, Native { value: count + 100 })?;
ctx.env.get_undefined()
}
#[js_function(1)]
fn get_native_object(ctx: CallContext) -> Result<JsNumber> {
let count: i32 = ctx.get::<JsNumber>(0)?.try_into()?;
let mut this: JsObject = ctx.this_unchecked();
let native: Native = ctx
.env
.unwrap(&mut this)?;
ctx.env.create_int32(native.value + 1)
}
const obj = {
attach: attachNativeObject,
get: getNativeObject,
}
obj.attach(100)
obj.get() // 101
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