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node_modules/es-abstract/2018/GetIterator.js

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+'use strict';
+
+var $TypeError = require('es-errors/type');
+
+var getIteratorMethod = require('../helpers/getIteratorMethod');
+var AdvanceStringIndex = require('./AdvanceStringIndex');
+var Call = require('./Call');
+var GetMethod = require('./GetMethod');
+var IsArray = require('./IsArray');
+
+var isObject = require('../helpers/isObject');
+
+var ES = {
+	AdvanceStringIndex: AdvanceStringIndex,
+	GetMethod: GetMethod,
+	IsArray: IsArray
+};
+
+// https://262.ecma-international.org/6.0/#sec-getiterator
+
+module.exports = function GetIterator(obj, method) {
+	var actualMethod = method;
+	if (arguments.length < 2) {
+		actualMethod = getIteratorMethod(ES, obj);
+	}
+	var iterator = Call(actualMethod, obj);
+	if (!isObject(iterator)) {
+		throw new $TypeError('iterator must return an object');
+	}
+
+	return iterator;
+};