| Node.js 18 Adds Core Test Runner |
| Written by Ian Elliot |
| Tuesday, 26 April 2022 |
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Node.js 18 has been released with improvements including the enabling by default of global fetch, and a core test runner module. Node.js is an open-source, cross-platform asynchronous event driven JavaScript runtime built on Chrome's JavaScript engine. It uses an event-driven, non-blocking I/O mode and executes JavaScript code outside web browsers.
This release has an experimental global fetch API that is available by default. The addition gives Node.js a standardized interface for fetching resources over HTTP. The promise-based client can be used to send simplified HTTP requests, and was inspired by node-fetch. Another addition is a node:test module that can be used to create JavaScript tests that report results in TAP (Test Anything Protocol) format. Tests created via the test module consist of a single function that is processed either as a synchronous function that is considered failing if it throws an exception; as a function that returns a Promise that is considered failing if the Promise rejects; or as a function that receives a callback function. If the callback receives any truthy value as its first argument, the test is considered failing. Node.js now exposes the experimental implementation of the Web Streams API on the global scope The other main change to this release is the update of the V8 JavaScript engine to 10.1, which is part of Chromium 101. This brings with it several new features, including support for the findLast() and findLastIndex() array methods, and improved performance of class fields and private class methods so that initializing them is now as fast as ordinary property stores. Node.js 18 is downloadable now.
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