// Flags: --expose-internals --no-warnings
'use strict';
const common = require('../common');
const {
  Event,
  EventTarget,
} = require('internal/event_target');
const { once } = require('events');

const et = new EventTarget();
(async function() {
  await once(et, 'foo');
  await once(et, 'foo');
})().then(common.mustCall());

et.dispatchEvent(new Event('foo'));
setImmediate(() => {
  et.dispatchEvent(new Event('foo'));
});