Checks if the given argument is a 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.
const isStream = val =>
  val !== null && typeof val === 'object' && typeof val.pipe === 'function';
const fs = require('fs');

isStream(fs.createReadStream('test.txt')); // true