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nodejs/benchmark/events/eventtarget.js

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'use strict';
const common = require('../common.js');
const bench = common.createBenchmark(main, {
n: [2e7],
listeners: [1, 5, 10]
}, { flags: ['--expose-internals'] });
function main({ n, listeners }) {
const { EventTarget, Event } = require('internal/event_target');
const target = new EventTarget();
for (let n = 0; n < listeners; n++)
target.addEventListener('foo', () => {});
const event = new Event('foo');
bench.start();
for (let i = 0; i < n; i++) {
target.dispatchEvent(event);
}
bench.end(n);
}