@extra-set/contains v1.1.5

Check if set contains all values (is subset).

var contains = require('setcontains');
// contains(<set>, <values>)

var a = new Set('wax');
contains(a, ['w', 'a', 'n', 'd']);
// false
contains(a, new Set('xw'));
// true
contains(a, new Set());
// true