# 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.

- Skill: `agentskillexchange/stress-test-javascript-and-typescript-test-suites-with-mutat` (Agent Skill)
- Install (CLI): `npx skillmds@latest add agentskillexchange/stress-test-javascript-and-typescript-test-suites-with-mutat`
- Raw SKILL.md: https://api.skillmd.com/api/skills/agentskillexchange/stress-test-javascript-and-typescript-test-suites-with-mutat/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: agentskillexchange (https://skillmd.com/u/agentskillexchange)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/agentskillexchange/stress-test-javascript-and-typescript-test-suites-with-mutat

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# 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.

## Prerequisites

Node.js, npm, a supported JavaScript or TypeScript test runner

## Installation

Use the upstream install or setup path that matches your environment:
- pnpm add --save-dev @stryker-mutator/core
- npx stryker run
- $ npx stryker <command> [options] [configFile]

Requirements and caveats from upstream:
- [![Node version](https://img.shields.io/node/v/@stryker-mutator/core.svg)](https://img.shields.io/node/v/@stryker-mutator/core.svg)

Basic usage or getting-started notes:
- Please follow the [quickstart on the website](https://stryker-mutator.io/docs/stryker-js/getting-started/).
- For small js projects, you can try the following command:
- # Only for small projects:

- Source: https://github.com/stryker-mutator/stryker-js
- Extracted from upstream docs: https://raw.githubusercontent.com/stryker-mutator/stryker-js/HEAD/README.md

## Documentation

- https://stryker-mutator.io/

## Source

- [Agent Skill Exchange](https://agentskillexchange.com/skills/stress-test-javascript-and-typescript-test-suites-with-mutation-testing-before-risky-changes-ship-with-strykerjs/)