is-stream

Check if an object is a stream

This feature allows you to check if a given object is a Node.js stream.

const isStream = require('is-stream');

isStream(process.stdin); // true
isStream({}); // false

Check if a stream is readable

This feature allows you to check if a stream is a readable stream.

const isStream = require('is-stream');

isStream.readable(process.stdin); // true
isStream.readable(process.stdout); // false

Check if a stream is writable

This feature allows you to check if a stream is a writable stream.

const isStream = require('is-stream');

isStream.writable(process.stdout); // true
isStream.writable(process.stdin); // false

Check if a stream is a duplex stream

This feature allows you to check if a stream is a duplex stream, which is both readable and writable.

const isStream = require('is-stream');
const { Duplex } = require('stream');

const duplexStream = new Duplex();
isStream.duplex(duplexStream); // true
isStream.duplex(process.stdin); // false

Check if a stream is a transform stream

This feature allows you to check if a stream is a transform stream, which is a type of duplex stream with additional functionality.

const isStream = require('is-stream');
const { Transform } = require('stream');

const transformStream = new Transform();
isStream.transform(transformStream); // true
isStream.transform(process.stdin); // false