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isDuplexStream

JS TODO

Checks if the given argument is a duplex (readable and writable) stream.

Check if the value is different from null, use typeof to check if a value is of type object and the pipe property is of type function. Additionally check if the typeof the _read, _write and _readableState, _writableState properties are function and object respectively.

const isDuplexStream = (val) =>
val !== null &&
typeof val === "object" &&
typeof val.pipe === "function" &&
typeof val._read === "function" &&
typeof val._readableState === "object" &&
typeof val._write === "function" &&
typeof val._writableState === "object";
const Stream = require("stream");
isDuplexStream(new Stream.Duplex()); // true