30-seconds-of-code/snippets/isStream.md

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Value is stream	node,type	blog_images/mountain-lake-cottage-2.jpg	2018-10-01T20:12:19+03:00	2020-10-20T23:02:01+03:00

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