Stream is readable
JavaScript, Node, Type · Oct 20, 2020

Checks if the given argument is a readable stream.
- Check if the value is different from
null
. - Use
typeof
to check if the value is of typeobject
and thepipe
property is of typefunction
. - Additionally check if the
typeof
the_read
and_readableState
properties arefunction
andobject
respectively.
const isReadableStream = val =>
val !== null &&
typeof val === 'object' &&
typeof val.pipe === 'function' &&
typeof val._read === 'function' &&
typeof val._readableState === 'object';
const fs = require('fs');
isReadableStream(fs.createReadStream('test.txt')); // true