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Mutation testing for JavaScript and friends

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[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Change | Age | Adoption | Passing | Confidence | |---|---|---|---|---|---| | [playwright](https://playwright.dev) ([source](https://togithub.com/microsoft/playwright)) | [`1.41.2` -> `1.42.0`](https://renovatebot.com/diffs/npm/playwright/1.41.2/1.42.0) |...

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com) This PR contains the following updates: | Package | Change | Age | Adoption | Passing | Confidence | |---|---|---|---|---|---| | [@babel/core](https://babel.dev/docs/en/next/babel-core) ([source](https://togithub.com/babel/babel/tree/HEAD/packages/babel-core)) | [`~7.23.9` -> `~7.24.0`](https://renovatebot.com/diffs/npm/@babel%2fcore/7.23.9/7.24.0) |...

I see a false positive there. The first time the code get excuted the folder /tmp/multipart would not exist, on second run it does. Therefore it looks like removing `{...

🐛 Bug

**Summary** The jest runner provides a lot of options that are deprecated. Probably good to update those. ``` ● Validation Warning: Unknown option "verbose" with value false was found. This...

🐛 Bug

Extends the [mutation levels PR](https://github.com/stryker-mutator/stryker-js/pull/4686) with the implementation of the adjusted (absolute) mutation score for the `clear-text` reporter. The PRs are separate to ensure that there are as few breaking...

## What? We've added support for mutation levels to improve the performance of Stryker. It includes mutation operators, mutation groups, mutation levels, documentation and tests. In addition, we have PRs...

**Is your feature request related to a problem? Please describe.** As outlined in the discussions at https://github.com/stryker-mutator/stryker-js/issues/3595 and https://github.com/stryker-mutator/stryker-js/issues/4142, we are also organizing our unit tests in a manner where...

🚀 Feature request

**Is your feature request related to a problem? Please describe.** We adhere to a test policy mandating that all modifications made by developers to the source code reach 100% test...

🚀 Feature request

i down loaded example code from stryker.io , and i am start doing steps given ,to get the reports but whenever i am doing npm run stryker , i am...

🐛 Bug
👶 Good first issue

**Is your feature request related to a problem? Please describe.** With [the deprecation of karma](https://github.com/karma-runner/karma/commit/450fdfdac5b999967daec1020f1ac69cf9b854ab), I suspect [Web Test Runner](https://modern-web.dev/docs/test-runner/overview/), amongst others, will increasingly be used to run in-browser tests....

🚀 Feature request