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'use strict'; const common = require('../common'); const Readable = require('stream').Readable; const bench = common.createBenchmark(main, { n: [1e5], sync: ['yes', 'no'], }); async function main({ n, sync }) { sync = sync === 'yes'; const s = new Readable({ objectMode: true, read() { if (sync) { this.push(1); } else { process.nextTick(() => { this.push(1); }); } } }); bench.start(); let x = 0; for await (const chunk of s) { x += chunk; if (x > n) { break; } } // Use x to ensure V8 does not optimize away the loop as a noop. console.assert(x); bench.end(n); }