Bun & Async functions

[FelixKLG]

I am very aware that Bun is not Node and isn't strictly supported by napi-rs, however the Bun team have on their docs that they support a majority of the Node API.

I have a simple async function in Rust which uses Reqwest to make a HTTP request:

use napi_derive::napi;

#[napi]
pub async fn get_data(user_id: String) -> String {
    let val = match reqwest::get(format!(
        "https://example.com/api/users/{}",
        user_id
    ))
    .await
    {
        Ok(val) => val,
        Err(e) => {
            println!("{:#?}", e);
            return "broken :(".to_owned();
        }
    };

    val.text().await.unwrap()
}

const mod = require('../../napi-bun/target/release/libnapi_bun.node');


(async () => {
    const fuck = await mod.getData("270150443512889344")

    console.log(fuck)
})();

When I run this via Node it works perfectly, the program waits and makes the request and I get the response back as I'd expect. However, when I run the exact same code with Bun the program just exits before any of the async code is polled, any blocking code before the async request works fine as expected but for some reason anything which requires async polling instantly closes bun. It doesn't appear to be a crash, I think it just thinks it's done.

I am aware it's not supported but I wanted to ask why might this be the case, I'm not sure why this doesn't work on Bun so I wanted to ask the people which would know better than I.

Bun's NAPI impl tracking issue: oven-sh/bun#158

[FelixKLG]

nvm was a quirk with bun, just use top level async.

the (async () => {}) syntax is a little fucked in Bun, but they have a very functional top level async.