30-seconds-of-code/snippets/js/s/is-stream.md

title, type, language, tags, cover, dateModified

title	type	language	tags	cover	dateModified
Value is stream	snippet	javascript	node type	mountain-lake-cottage-2	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