1'use strict'; 2 3const common = require('../common'); 4const assert = require('assert'); 5 6const { PerformanceObserver, performance } = require('perf_hooks'); 7const DELAY = 1000; 8const ALLOWED_MARGIN = 10; 9 10const expected = ['Start to Now', 'A to Now', 'A to B']; 11const obs = new PerformanceObserver(common.mustCall((items) => { 12 items.getEntries().forEach(({ name, duration }) => { 13 assert.ok(duration > (DELAY - ALLOWED_MARGIN)); 14 assert.strictEqual(expected.shift(), name); 15 }); 16})); 17obs.observe({ entryTypes: ['measure'] }); 18 19performance.mark('A'); 20setTimeout(common.mustCall(() => { 21 performance.measure('Start to Now'); 22 performance.measure('A to Now', 'A'); 23 24 performance.mark('B'); 25 performance.measure('A to B', 'A', 'B'); 26}), DELAY); 27