Modern systems rarely fail because of a single bug. More often, they degrade under realworld pressure: sudden traffic spikes, chatty cross-service calls, slow leaks that only surface after hours of load. Performance issues now emerge continuously in production, not during a dedicated test phase. Cloud environments and

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k6 is a popular JavaScript-based performance testing tool, but teams working in Scala face a mismatch in tooling and type safety. This article demonstrates how to write k6 tests in Scala using Scala.js, providing compile-time guarantees and integration with existing Scala codebases. It covers the technical implementation, build tool integration (sbt, mill, Gradle), and performance benchmarks showing modest overhead. While JavaScript remains the default choice for k6, Scala.js offers advantages for teams already invested in Scala ecosystems who value type safety and code reuse.

Seamless k6.io Performance Testing in Scala Projects Using Scala.js

Pros and Cons of Writing k6 Tests in Scala.js