Effect 4 mutation testing framework for TypeScript & JavaScript with in-memory V8 execution, Vitest runner sandbox, and real-time NDJSON event streams.
javascript testing typescript v8 functional-programming mutation-testing test-runner ast ci-cd developer-tools code-quality ndjson code-coverage software-testing stryker oxc effect-ts vitest mutation-score tool-automation
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Updated
Sep 25, 2026 - TypeScript