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Await Promise

Await Promise

Awaiting a JavaScript Promise in Rust sounds crazy, but it's feasible in NAPI-RS.

💡

Awaiting a JavaScript Promise needs the tokio_rt and napi4 features to be enabled.

use napi::bindgen_prelude::*;

#[napi]
pub async fn async_plus_100(p: Promise<u32>) -> Result<u32> {
  let v = p.await?;
  Ok(v + 100)
}
import { asyncPlus100 } from './index.js'

const fx = 20
const result = await asyncPlus100(
  new Promise((resolve) => {
    setTimeout(() => resolve(fx), 50)
  }),
)

console.log(result) // 120