test

Last updated Jun 5, 2026 Note

For compatibility dates of 2026-08-04 or later, Workers enables both nodejs_compat and nodejs_compat_v2 by default. These flags are not used for these compatibility dates. Existing projects do not need to remove them when updating their compatibility date. For earlier dates, add nodejs_compat to your Wrangler configuration file to opt in. For instructions to turn off Node.js compatibility, refer to the Node.js compatibility flag.

MockTracker

The MockTracker API in Node.js provides a means of tracking and managing mock objects in a test environment.

import { mock } from 'node:test';

const fn = mock.fn();
fn(1,2,3);  // does nothing... but

console.log(fn.mock.callCount());  // Records how many times it was called
console.log(fn.mock.calls[0].arguments);  // Records the arguments that were passed each call

The full MockTracker API is documented in the Node.js documentation for MockTracker ↗︎.

The Workers implementation of MockTracker currently does not include an implementation of the Node.js mock timers API ↗︎.

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description: Use the Node.js timers API in Cloudflare Workers to schedule functions with setTimeout, setInterval, and setImmediate. title: timers image: https://developers.cloudflare.com/workers/runtime-apis/nodejs/timers/og.png?v=5e5ce8c0dd1a75c9

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