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isWritableStream javascript Code Snippet in 2024

nodetypeintermediate

Last Updated: 17 June 2024

Checks if the given argument is a writable 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 _write and _writableState properties are function and object respectively.
const isWritableStream = val => val !== null && typeof val === 'object' && typeof val.pipe === 'function' && typeof val._write === 'function' && typeof val._writableState === 'object';
const fs = require('fs'); isWritableStream(fs.createWriteStream('test.txt')); // true

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