arrify 
Convert a value to an array
Install
$ npm install arrify
Usage
const arrify = require('arrify');
arrify('🦄');
//=> ['🦄']
arrify(['🦄']);
//=> ['🦄']
arrify(new Set(['🦄']));
//=> ['🦄']
arrify(null);
//=> []
arrify(undefined);
//=> []
Supplying null or undefined results in an empty array.
License
MIT © Sindre Sorhus