Value is stream

OSCC · JavaScript, Node, Type · Oct 20, 2020

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

Recommended snippets

  • Stream is duplex

    JavaScript, Node

    Checks if the given argument is a duplex (readable and writable) stream.

  • Stream is writable

    JavaScript, Node

    Checks if the given argument is a writable stream.

  • Stream is readable

    JavaScript, Node

    Checks if the given argument is a readable stream.