puppeteer wait for an event to fire

puppeteer-waitforevent.js

/**
 * Wait for the browser to fire an event (including custom events)
 * @param {object} puppeteerPage - puppeteer page
 * @param {string} eventName - Event name
 * @param {integer} [seconds] - number of seconds to wait (default=30)
 * @returns {Promise<object>} resolves when event fires or timeout is reached
 */
async function waitForEvent(puppeteerPage, eventName, seconds) {

    seconds = seconds || 30;

    // use race to implement a timeout
    return Promise.race([

        // add event listener and wait for event to fire before returning
        puppeteerPage.evaluate(function(eventName) {
            return new Promise(function(resolve, reject) {
                window.addEventListener(eventName, function(e) {

                    // resolves when the event fires
                    resolve({
                        type: e.type,
                        detail: e.detail,
                        timeStamp: e.timeStamp
                    });
                });
            });
        }, eventName),

        // if the event does not fire within n seconds, exit
        new Promise(function(resolve) {
            setTimeout(resolve, seconds * 1000);
        })
    ]);
}