collect‑all is a small Node.js utility that creates a duplex stream which buffers all incoming data, runs an optional callback once the input ends, and then emits the processed result downstream. It’s useful for command‑line tools or pipelines that need to gather all data (as a Buffer or, in object mode, as an array) before continuing, and is aimed at developers working with Node streams. (The package is now deprecated in favor of the Promise‑based stream‑read‑all.)