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is-stream 
#
Check if something is a Node.js stream
Install#
$ npm install --save is-streamUsage#
const fs = require('fs');
const isStream = require('is-stream');
isStream(fs.createReadStream('unicorn.png'));
//=> true
isStream({});
//=> falseAPI#
isStream(stream)#
isStream.writable(stream)#
isStream.readable(stream)#
isStream.duplex(stream)#
isStream.transform(stream)#
License#
MIT © Sindre Sorhus