duplexify

Turn a writable and readable stream into a streams2 duplex stream with support for async initialization and streams1/streams2 input

pumpify

Combine an array of streams into a single duplex stream using pump and duplexify

@esm2cjs/is-stream

Check if something is a Node.js stream. This is a fork of sindresorhus/is-stream, but with CommonJS support.