terrazzo 0.2.8

The Terrazzo library to build dynamic web pages in Rust
Documentation 
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use std::time::Duration;

use futures::channel::oneshot;
use nameth::NamedEnumValues as _;
use nameth::nameth;
use wasm_bindgen::JsCast as _;
use wasm_bindgen::JsValue;
use wasm_bindgen::prelude::Closure;

pub async fn sleep(timeout: Duration) -> Result<(), SleepError> {
    let (tx, rx) = oneshot::channel();
    let closure = Closure::once(|| {
        let _ = tx.send(());
    });
    let window = web_sys::window().expect("window");
    let handle = window
        .set_timeout_with_callback_and_timeout_and_arguments_0(
            closure.as_ref().unchecked_ref(),
            timeout.as_millis() as i32,
        )
        .map_err(SleepError::SetTimeout)?;
    let closure = Some(closure);
    let mut closure = scopeguard::guard(closure, |closure| {
        if closure.is_some() {
            window.clear_timeout_with_handle(handle);
        }
    });
    let () = rx
        .await
        .inspect_err(|oneshot::Canceled| window.clear_timeout_with_handle(handle))
        .map_err(SleepError::Canceled)?;
    *closure = None; // closure must outlive the await.
    Ok(())
}

#[nameth]
#[derive(thiserror::Error, Debug)]
pub enum SleepError {
    #[error("[{n}] {0:?}", n = self.name())]
    SetTimeout(JsValue),

    #[error("[{n}] {0:?}", n = self.name())]
    Canceled(oneshot::Canceled),
}