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Mutation testing for JavaScript and friends

Results 191 stryker-js issues
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Hello, I did [that utility](https://github.com/tverhoken/stryker-diff-runner) for Stryker that allow to run stryker only for the diff files between current branch and "origin/master" in order to be able to run mutation...

We are using esm in our mocha tests, to support testing frontend classes that get transpiled to es6 code with import statements. When we add esm to our config, like...

🐛 Bug

**Summary** I have recently configured stryker as per the "[Getting started](https://stryker-mutator.io/docs/stryker-js/getting-started)". When I tried `stryker run` there are no mutants which were killed. So, I doubted myself and tried mutating(changing)...

🐛 Bug

**Summary** I found out that Stryker runs jest with `runInBand: true` option. And this makes initial test run very very slow for me, and it is fails with timeout error...

⁉ Question

Support Ava.js with a Test Runner plugin. Its been over 3 years since this was originally requested ([Original Request](https://github.com/stryker-mutator/stryker-js/issues/243)). From what I understand there seems to be movement in the...

🚀 Feature request

**Summary** In the below code I don't believe the `ObjectLiteral` mutation should have been created. ![image](https://user-images.githubusercontent.com/51504/141817802-8bdd65c3-186d-40dd-a2a9-8591160d7cc6.png) ```ts function renderTime(time: Temporal.PlainTime): Renderable { /* Stryker disable next-line StringLiteral, ObjectLiteral */ return...

🐛 Bug

Implement the hit counter for Jest 🃏. This is to prevent infinite loops from resulting in a timeout, see #3023.

🚀 Feature request
hacktoberfest
hacktoberfest-accepted

Right now, the `stryker init` command results in a stripped down config file, without any explanation. For example, if you choose "mocha" as your test runner, you'll get an example...

🚀 Feature request
hacktoberfest

**Is your feature request related to a problem? Please describe.** Sadly stryker does not fully work with https://pnpm.io/ **Describe the solution you'd like** All features are appropriately supported. **Describe alternatives...

🚀 Feature request
hacktoberfest

**Is your feature request related to a problem? Please describe.** The mutation test is very expensive and time-consuming in medium and large projects, and its execution in all Pull Requests...

🚀 Feature request