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isReadableStream javascript Code Snippet in 2022

nodetypeintermediate

Last Updated: 25 September 2022

Checks if the given argument is a readable stream.

  • Check if the value is different from null.
  • Use typeof to check if the value is of type object and the pipe property is of type function.
  • Additionally check if the typeof the _read and _readableState properties are function and object respectively.
const isReadableStream = val => val !== null && typeof val === 'object' && typeof val.pipe === 'function' && typeof val._read === 'function' && typeof val._readableState === 'object';
const fs = require('fs'); isReadableStream(fs.createReadStream('test.txt')); // true

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