Dev Challenge! What are all the issues with this code? Hint: there are several.

devChallenge1.js

var hyperquest = require('hyperquest');
var result;
module.exports = function downloadUtf8FileIntoString(url, cb) {
	if (!url) return cb(Error('url is required'));
	result = '';
	hyperquest(url)
		.pipe(function (chunk, enc, tCb) { 
			result += chunk.toString('utf8');	// binary to utf8
			tCb();
		})
		.on('finish', function () {
			cb(result);		// all done
		})
}

You're right -- updated to be more specific