Skill Detail
Stress-test JavaScript and TypeScript test suites with mutation testing before risky changes ship with StrykerJS
Run mutation testing against JS or TS projects to find tests that still pass when real defects are introduced.
Code Quality & ReviewMulti-Framework
Code Quality & Review
Multi-Framework
Security Reviewed
⭐ 2.8k GitHub stars
⬇ 1.5M/wk npm
INSTALL WITH ANY AGENT
npx skills add agentskillexchange/skills --skill stress-test-javascript-and-typescript-test-suites-with-mutation-testing-before-risky-changes-ship-with-strykerjs
Works best when you want a reusable capability, not another fragile one-off prompt.
At a glance
Tools required
Node.js, npm, a supported JavaScript or TypeScript test runner
Install & setup
Install the core package with `npm install –save-dev @stryker-mutator/core`, run the Stryker initializer or config flow for your test runner, then execute Stryker as a pre-merge or pre-release mutation test step.
Author
Stryker Mutator
Publisher
Organization
Last updated
Apr 14, 2026
Quick brief
Use StrykerJS when an agent needs to measure whether a JavaScript or TypeScript test suite actually catches meaningful code changes, especially before merges, refactors, or releases. This is distinct from using the project normally because the job is specifically mutation-testing and reporting weak assertions, surviving mutants, and test effectiveness gaps. The scope boundary is clear: it is a mutation-testing quality gate, not a general test runner, framework, or CI platform listing.