Orchestrion‑JS (`@apm-js-collab/code‑transformer`) is a library that rewrites JavaScript/Node.js source code to automatically inject calls to Node’s `TracingChannel`, enabling fine‑grained APM instrumentation. It’s intended for developers building or maintaining tracing hooks or bundler plugins (e.g., for webpack, Vite, Rollup, esbuild) who need a programmatic way to match and instrument specific functions, methods, or class constructors at build‑time or load‑time.