node_modules/core-js/fn/weak-set/from.js

'use strict';
require('../../modules/es6.weak-set');
require('../../modules/es7.weak-set.from');
var $WeakSet = require('../../modules/_core').WeakSet;
var $from = $WeakSet.from;
module.exports = function from(source, mapFn, thisArg) {
  return $from.call(typeof this === 'function' ? this : $WeakSet, source, mapFn, thisArg);
};