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Includes built-in functions for mocking timers, functions, and module behaviors. javascript
Node 18 started the transition to prefix-only core modules (e.g., node:test , node:fs ). While this causes some headaches for legacy code, it clears up namespace collisions and improves clarity. node 18 full
The test runner is stable in Node 18. If you see warnings, ensure you are using node --test without extra flags. Update Node to the latest 18.x.x patch.
While version 18 is no longer maintained by the core Node.js project, its architecture, especially the integration of web standards like fetch() and the node:test runner, has set a new benchmark. For future projects, the current LTS version is the recommended foundation, inheriting and refining the innovations first made accessible in this "full" and influential release. This public link is valid for 7 days
// test.mjs import test from 'node:test'; import assert from 'node:assert';
If you are managing apps running on Node.js 18, plan upgrades toward newer active LTS releases (such as Node.js 20 or Node.js 22) to ensure ongoing security patches, runtime performance improvements, and full support for newer ECMAScript standards. Can’t copy the link right now
The inclusion of a native fetch() API stands as the most impactful change in Node.js 18. This addition brought browser-compatible HTTP requests directly into the runtime without external dependencies like node-fetch or axios . Undici Integration