Is there a way to create a Promise in Node JS that will only resolve when a specific event is emitted by an event emitter?
I am trying out the following code snippet, but I am unsure how to make the promise wait until the event occurs.
function bar(resolve,reject){
something.on("random",() => {
resolve("success");
});
}
let q = new Promise(bar);
q.then(() => {
console.log("Event successfully emitted!");
});
Your code looks great, but one improvement you can make is to use once instead of on. This way, the event handler will be removed after the first occurrence of the event - since the promise can only be resolved once anyway.
If you are using node v11.13.0 or higher, you have the option to utilize the events.once method. This eliminates the need for manually building the promise and also ensures error events are handled correctly:
import { once } from 'events';
const p = once(something, "random");
p.then(() => {
console.log("Event successful!");
});
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