set-tojson/requireSet.js

ES7 Proposal: Set#toJSON https://github.com/DavidBruant/Map-Set.prototype.toJSON

'use strict';

var GetIntrinsic = require('es-abstract/GetIntrinsic');
var $Set = GetIntrinsic('%Set%', true);
var $TypeError = GetIntrinsic('%TypeError%');

module.exports = function requireGlobalSet() {
	if (!$Set) {
		throw new $TypeError('Set.prototype.toJSON requires Set (either native, or polyfilled with es6-shim)');
	}
};