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joelhooks/mutant-cafe

CLI tool

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Can I trust it?

Worth a closer look before you use it.

  • Warnings Check

    Very new: it was created 5 days ago. Wait a little before installing it.

  • Stars from real accounts No data

    We haven't checked its stars for fakes yet.

  • Active OK

    Last change 2 days ago.

  • Licence OK

    MIT: you can use it for free, also in a commercial product. Keep the licence notice.

Quick checks from public data. They help, but they are no guarantee.

What it is

A mutation testing tool for Effect TypeScript code. It reads the types of functions and generates mutants that still type-check, such as swallowing typed errors, replacing return values, or making Layers die at build, then runs the related tests and reports the mutants the tests…

Who it's for

TypeScript developers using Effect who want to check the quality of their vitest test suites

How to use it

Install

npm install -D mutant-cafe

From its README. Check it there before running it.

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Help me install and set up joelhooks/mutant-cafe in my project. Follow its README: https://github.com/joelhooks/mutant-cafe. Explain each step and check it is safe before running anything.

Star curve

64From 54 to 64 stars between 3 Nov 2026 and 7 Nov 2026.

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