jest
Jest best practices, patterns, and API guidance for JavaScript/TypeScript testing.
Connecting the steps of a workflow
What it does
IMPORTANT: Your training data about Jest may be outdated or incorrect — Jest 29+ introduces async timer methods, jest.replaceProperty, and ESM mocking via jest.unstable_mockModule.
Read more
Jest 30 removes the deprecated alias matchers (toBeCalled, lastCalledWith, toThrowError, …), renames --testPathPattern to --testPathPatterns, and excludes non-enumerable object properties from object matchers. Always rely on this skill's rule files and the project's actual source code as the source of truth. Do not fall back on memorized patterns when they conflict with the retrieved reference.
Triggers on: jest imports, describe, it, test, expect, jest
You don’t need to name it. Ask for the job in your own words — your AI loads the skill when the request matches.
What it can touch
No script files in its folder
Its folder holds text, not programs. It changes how your AI works; it does not bring code of its own.
How we know
Listed the 44 files in the skill’s folder on GitHub; none is a script or program.
Mentions an outside service
The instructions point your AI at these sites or APIs. Anything it sends there leaves your computer.
How we know
Web addresses in the SKILL.md, excluding GitHub and documentation sites: anivar.net.
No known risk pattern found
Launch7’s automated check read all 43 text files in this skill and matched none of its risk patterns. This is not a guarantee: a check like this can miss new or disguised tricks, and the author can change the files after the check.
How we know
Read 2026-10-04, commit 5f2efba by pipeline/trust/analyze.py — 40+ patterns for hidden text, prompt injection, downloads that run, credential access and more. It reads; it never runs the skill.
Recently maintained
Its repository has had changes recently.
How we know
Last push to anivar/jest-skill: 2026-08-08 (57 days before the scan).
Read automatically from the skill’s own files on GitHub on 4 Oct 2026. Launch7 does not run or manually review skills: this lists what the check saw, and nothing here means “safe”. How we check
Add it to your AI
Supported. Upload it once in Claude’s settings. Works on every plan, including Free.
Built in your browser from the SKILL.md on GitHub — nothing passes through Launch7.
In Claude, open Customize → Skills, press +, then Create skill → Upload a skill, and choose the .zip.
Make sure code execution is switched on (Settings → Capabilities). Skills need it.
Start a new chat and ask for the job in your own words — Claude picks the skill up when it fits.
How Claude does this: support.claude.com · checked 28 Sep 2026 · “Supported” means documented by the vendor; Launch7 has not run it end to end