Jest Environment JSDOM version 27.4.6 represents a minor update to the popular Jest testing environment simulating a browser environment for JavaScript code. It builds upon the preceding version, 27.4.4, primarily through updates to its internal dependencies. Developers should note the refinements in dependencies like @jest/fake-timers which jumps from version 27.4.2 to 27.4.6 and @jest/environment going from 27.4.4 to 27.4.6. This indicates potential improvements, bug fixes, or new features within those core Jest modules that directly influence the JSDOM environment.
Crucially, the core dependency on jsdom, which provides the actual browser-like environment, remains consistent at ^16.6.0. Meaning the underlying simulated browser capabilities are unchanged between these two versions. This update emphasizes stability and enhancements within the Jest framework itself, rather than a significant overhaul of the browser emulation.
For developers, upgrading to 27.4.6 is generally recommended to leverage the latest Jest improvements and bug fixes. While the fundamental JSDOM functionality isn't drastically altered, keeping dependencies up-to-date ensures compatibility, performance and access to the newest enhancements of the Jest testing ecosystem. Both versions maintain the MIT license, ensuring flexibility in usage and distribution. The update occured around a month later implying this is a patch.
The are not vulnerabilities for the version 27.4.6 of the package jest-environment-jsdom
