Is it possible to asynchronously wait for a Node.js Event Emitter 'event.on()' to populate, before executing the rest of the function?

Sample code:

import { EventEmitter } from 'node:events'
let bus = new EventEmitter()

async function demo(){

    
    let foo


    const listen = async function (channelName, callback){ 

        await bus.on(channelName, data => { callback(data) })

    }


    await listen('test', data => { 

        foo = data 

    })


    // Artificially introducing a delay fixes this
    // while (foo == undefined){ await new Promise(resolve => setTimeout(resolve, 1000)) }

    // but without the day returns 'undefined'
    console.log(foo)

}
demo()

I suspect this is just an issue of me not being familiar with the correct async syntax / structure.

I have tried a dozen variations of adding 'await', but no luck.

Info appreciated!

thanks to trincot at the answer below, and the same method at this comment, it's up and working

You'll need to create a promise that resolves when the on event occurs. This you can do with new Promise and calling resolve when that event occurs.

Something like:

const channelData = (bus, channelName) => 
    new Promise(resolve => bus.on(channelName, resolve));

async function demo() {
    const foo = await channelData(bus, 'test');
    console.log(foo);
}

demo();