CommonJS versus ESM, worker threads, clustering, buffers, and process and memory limits.
3 questions in Node.js & TypeScript.
ESM resolves asynchronously and exposes live read-only bindings, CommonJS resolves synchronously and returns a mutable object, and interop leaks in both directions. Extra cores come from worker threads for CPU work, cluster or replicas for connections, child processes for other programs.
Node.js stream backpressure prevents a fast producer from filling memory while a slow consumer catches up. The core signal is write() returning false and the producer waiting for drain before sending more.
Not one package but its whole transitive closure, install-time scripts from every node in it, a build that now depends on the registry being reachable, and the possibility of two resolved copies of the same library whose instances fail each other's identity checks.