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isDuplexStream javascript Code Snippet in 2024

nodetypeintermediate

Last Updated: 27 March 2024

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

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