@systemfsoftware/stryker-js-engine

The host-neutral mutation engine: it runs a mutation test — reading the project, instrumenting it, spawning the workers and scoring the run — through ports a process entry binds. The engine names no runtime: its manifest carries no @effect/platform-* dependency and no engines field. The published process entries live in @systemfsoftware/stryker-js-cli, which binds the Node layers (FileSystem, Path, ChildProcessSpawner, Module, sockets) around makeRunLayer and owns the worker files.

pnpm add @systemfsoftware/stryker-js-engine effect

effect is a peer dependency: this package declares it but does not install it, so the host pins one version across the whole run.

Subpaths

• @systemfsoftware/stryker-js-engine — the run, its stages, and the failure identities it raises
• ./builtin-reporters — the clear-text, progress, and JSON reporters
• ./worker — the worker-side wiring a worker entry file calls into

A host other than Node starts the same engine by providing its own layers at the process that calls makeRunLayer; it does not fork these sources.