stream-exhaust is a Node.js utility library designed to ensure that a given stream is actively flowing data without altering its original behavior. It is particularly useful for developers working with Node.js streams, especially when dealing with streams that haven't been piped to another stream. The library avoids mutating the stream by either calling `.resume()` for streams1 streams or piping it to a "black hole" stream for streams2+ streams, making it a valuable tool for maintaining stream integrity.