maybe‑combine‑errors is a tiny Node.js utility that merges an array of `Error` objects into a single error. It skips null/undefined entries, returns undefined for an empty list, returns the sole error unchanged, and otherwise creates a combined error whose message concatenates unique messages and whose stack is lazily joined; it also preserves `transient` and `expected` flags. It’s useful for developers who need concise, aggregate error reporting in JavaScript/Node applications.