node_modules/core-js/library/modules/es6.array.join.js

'use strict';
// 22.1.3.13 Array.prototype.join(separator)
var $export = require('./_export');
var toIObject = require('./_to-iobject');
var arrayJoin = [].join;

// fallback for not array-like strings
$export($export.P + $export.F * (require('./_iobject') != Object || !require('./_strict-method')(arrayJoin)), 'Array', {
  join: function join(separator) {
    return arrayJoin.call(toIObject(this), separator === undefined ? ',' : separator);
  }
});