1'use strict'; 2 3const common = require('../common'); 4const assert = require('assert'); 5 6const { PerformanceObserver, performance } = require('perf_hooks'); 7const DELAY = 1000; 8 9const expected = ['Start to Now', 'A to Now', 'A to B']; 10const obs = new PerformanceObserver(common.mustCall((items) => { 11 const entries = items.getEntries(); 12 const { name, duration } = entries[0]; 13 assert.ok(duration > DELAY); 14 assert.strictEqual(expected.shift(), name); 15}, 3)); 16obs.observe({ entryTypes: ['measure'] }); 17 18performance.mark('A'); 19setTimeout(common.mustCall(() => { 20 performance.measure('Start to Now'); 21 performance.measure('A to Now', 'A'); 22 23 performance.mark('B'); 24 performance.measure('A to B', 'A', 'B'); 25}), DELAY); 26