counterfact/dist/util/wait-for-event.js

a library for building a fake REST API for testing

import { EventEmitter } from "node:events";
/**
 * Creates a promise that resolves when a specified event is fired on the given EventTarget.
 * @param {EventTarget | EventEmitter} target - The target to listen for the event on.
 * @param {string} eventName - The name of the event to listen for.
 * @returns {Promise<Event>} A promise that resolves with the event object when the event is fired.
 */
export async function waitForEvent(target, eventName) {
    return await new Promise((resolve) => {
        const handler = (event) => {
            if (target instanceof EventTarget) {
                target.removeEventListener(eventName, handler);
            }
            resolve(event);
        };
        if (target instanceof EventEmitter) {
            target.once(eventName, handler);
        }
        else {
            target.addEventListener(eventName, handler);
        }
    });
}