Macro flutter_rust_bridge::spawn

macro_rules! spawn {
    ($($tt:tt)*) => { ... };
}

Spawn a task using the internal thread pool. Interprets the parameters as a list of captured transferables to send to this thread.

Also see transfer.

Example:

let (tx, rx) = std::sync::mpsc::channel();
flutter_rust_bridge::spawn!(|| {
    tx.send(true).unwrap();
});
assert_eq!(rx.recv(), Ok(true));

Sending a JS transferable:

use web_sys::{MessagePort, MessageEvent};
use wasm_bindgen::prelude::*;

let channel = web_sys::MessageChannel::new().unwrap();

let onmessage = Closure::new(move |event: MessageEvent| {
    assert!(event.data() == true);
});
channel.port1().set_onmessage(Some(onmessage.as_ref().unchecked_ref()));
onmessage.forget();
let port2 = channel.port2();
// Declare the transferable with the same name and type
flutter_rust_bridge::spawn!(|port2: MessagePort| {
    port2.post_message(&JsValue::from(true)).unwrap();
});