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A utility method for creating duplex streams.

• Stream converts writable stream into writable Duplex and readable stream to Duplex.

• Blob converts into readable Duplex.

• string converts into readable Duplex.

• ArrayBuffer converts into readable Duplex.

• AsyncIterable converts into a readable Duplex. Cannot yield null.

• AsyncGeneratorFunction converts into a readable/writable transform Duplex. Must take a source AsyncIterable as first parameter. Cannot yield null.

• AsyncFunction converts into a writable Duplex. Must return either null or undefined

• Object ({ writable, readable }) converts readable and writable into Stream and then combines them into Duplex where the Duplex will write to the writable and read from the readable.

• Promise converts into readable Duplex. Value null is ignored.